{"id":2341,"date":"2026-04-09T05:32:03","date_gmt":"2026-04-09T05:32:03","guid":{"rendered":"https:\/\/www.arcticheatpumps.com\/blog\/?p=2341"},"modified":"2026-07-06T10:49:05","modified_gmt":"2026-07-06T10:49:05","slug":"how-do-air-to-water-heat-pumps-work","status":"publish","type":"post","link":"https:\/\/www.arcticheatpumps.com\/blog\/how-do-air-to-water-heat-pumps-work.html","title":{"rendered":"How Do Air-to-Water Heat Pumps Work?"},"content":{"rendered":"\t\t<div data-elementor-type=\"wp-post\" data-elementor-id=\"2341\" class=\"elementor elementor-2341\">\n\t\t\t\t\t\t<section class=\"elementor-section elementor-top-section elementor-element elementor-element-7f4173a elementor-section-boxed elementor-section-height-default elementor-section-height-default\" data-id=\"7f4173a\" data-element_type=\"section\" data-e-type=\"section\" data-settings=\"{&quot;jet_parallax_layout_list&quot;:[]}\">\n\t\t\t\t\t\t<div class=\"elementor-container elementor-column-gap-default\">\n\t\t\t\t\t<div class=\"elementor-column elementor-col-100 elementor-top-column elementor-element elementor-element-017a398\" data-id=\"017a398\" data-element_type=\"column\" data-e-type=\"column\">\n\t\t\t<div class=\"elementor-widget-wrap elementor-element-populated\">\n\t\t\t\t\t\t<div class=\"elementor-element elementor-element-2ecc63d elementor-widget elementor-widget-text-editor\" data-id=\"2ecc63d\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<h2><b>The Technology Powering North America&#8217;s Heating Revolution<\/b><\/h2><p><span style=\"font-weight: 400;\">Air-to-water heat pumps are rapidly replacing gas boilers and electric resistance heaters across Canada and the United States for a good reason. They can deliver 3 to 5.5 units of heat energy for every unit of electricity consumed, making them the most efficient heating technology available for residential and commercial buildings in cold climates.<\/span><\/p><p><span style=\"font-weight: 400;\">But how, exactly, does a machine extract useful heat from outdoor air that may be at -20\u00b0C or colder? The answer lies in refrigeration thermodynamics, the same fundamental physics used in your refrigerator. But, engineered to run in reverse and optimized for extreme cold-climate performance.<\/span><\/p><p><span style=\"font-weight: 400;\">This guide explains the complete operating cycle of an air-to-water heat pump, breaks down every key component, compares the technology against conventional alternatives, and covers how Arctic Heat Pumps&#8217; cold-climate EVI DC inverter technology delivers reliable heating performance even in the harshest North American winters.<\/span><\/p><p><b>\ud83d\udccc Key Insight: <\/b><i><span style=\"font-weight: 400;\">An air-to-water heat pump does not generate heat &#8211; it moves existing thermal energy from outdoor air into your building&#8217;s water-based heating system. This distinction is why its efficiency can exceed 100%.<\/span><\/i><\/p><h2><b>What Is an Air-to-Water Heat Pump?<\/b><\/h2><p><span style=\"font-weight: 400;\">An air-to-water (ATW) heat pump is a mechanical refrigeration system that extracts low-grade thermal energy from outdoor ambient air and upgrades it to a higher temperature for delivery into a building via a hydronic (water-based) distribution system.<\/span><\/p><p><span style=\"font-weight: 400;\">Unlike a mini-split or air-to-air heat pump, which heats or cools air directly. That hot water is then distributed through your building using one or more of the following systems:<\/span><\/p><ul><li style=\"font-weight: 400;\" aria-level=\"1\"><b>Radiant Floor Heating:<\/b><span style=\"font-weight: 400;\"> PEX tubing embedded in concrete or under flooring, providing silent, even warmth from the floor up<\/span><\/li><li style=\"font-weight: 400;\" aria-level=\"1\"><b>Hydronic Fan Coils:<\/b><span style=\"font-weight: 400;\"> Water-to-air heat exchangers that can both heat and cool, ideal for retrofit installations.<\/span><\/li><li style=\"font-weight: 400;\" aria-level=\"1\"><b>High-Wall Fan Coils:<\/b><span style=\"font-weight: 400;\"> Ductless indoor units connected to the water loop, offering zone-by-zone temperature control<\/span><\/li><li style=\"font-weight: 400;\" aria-level=\"1\"><b>Domestic Hot Water (DHW):<\/b><span style=\"font-weight: 400;\"> The heat pump can simultaneously or sequentially heat your household hot water supply<\/span><\/li><li style=\"font-weight: 400;\" aria-level=\"1\"><b>Hydronic Air Handlers:<\/b><span style=\"font-weight: 400;\"> Ducted distribution for whole-home forced-air delivery using water as the heat transfer medium<\/span><\/li><\/ul><p><span style=\"font-weight: 400;\">Arctic Heat Pumps offers a complete range of hydronic distribution equipment. Explore the full lineup on the <\/span><a href=\"https:\/\/www.arcticheatpumps.com\/hydronic-equipment.html\"><span style=\"font-weight: 400;\">Hydronic Equipment page<\/span><\/a><span style=\"font-weight: 400;\">.<\/span><\/p><h2><b>How an Air-to-Water Heat Pump Works: The Refrigeration Cycle<\/b><\/h2><p><span style=\"font-weight: 400;\">The operating principle is the reverse refrigeration cycle &#8211; also called the vapor compression cycle. Here is how each stage works in sequence:<\/span><\/p><h2><b>Stage 1: Evaporation &#8211; Absorbing Heat from Outdoor Air<\/b><\/h2><p><span style=\"font-weight: 400;\">A large fan draws outdoor air across the evaporator. A heat exchanger containing cold liquid refrigerant circulating at temperatures well below the outdoor air temperature (sometimes as low as -40\u00b0C in cold-climate designs). Even at sub-zero outdoor temperatures, the refrigerant is colder than the air, so heat naturally flows from the air into the refrigerant. This causes the liquid refrigerant to boil and evaporate into a low-pressure gas, absorbing substantial latent heat in the process.<\/span><\/p><p><b>\u2699\ufe0f Technical note: <\/b><i><span style=\"font-weight: 400;\">The refrigerant&#8217;s boiling point is engineered to be extremely low &#8211; well below freezing &#8211; which is why the evaporation stage can extract heat even when outdoor air is at -25\u00b0C or colder.<\/span><\/i><\/p><h2><b>Stage 2: Compression &#8211; Upgrading the Heat<\/b><\/h2><p><span style=\"font-weight: 400;\">The low-pressure refrigerant gas travels to the compressor. The compressor is a core of the system. It\u00a0 squeezes the gas, dramatically raising both its pressure and temperature. This is where electrical energy enters the system, but the energy input is small relative to the heat energy being moved.<\/span><\/p><p><span style=\"font-weight: 400;\">Arctic Heat Pumps uses Enhanced Vapor Injection (EVI) DC inverter compressor technology in its cold-climate models. EVI injects additional refrigerant vapor mid-compression, increasing the temperature lift achievable at extreme outdoor temperatures and maintaining high COP values that standard compressors cannot sustain below -10\u00b0C.<\/span><\/p><p><span style=\"font-weight: 400;\">Learn more about how Arctic&#8217;s EVI technology works on the <\/span><a href=\"https:\/\/www.arcticheatpumps.com\/evi-dc-inverter-for-heat-pumps.html\"><span style=\"font-weight: 400;\">EVI DC Inverter for Heat Pumps page<\/span><\/a><span style=\"font-weight: 400;\">.<\/span><\/p><h2><b>Stage 3: Condensation &#8211; Transferring Heat to Your Water Loop<\/b><\/h2><p><span style=\"font-weight: 400;\">The now-hot, high-pressure refrigerant gas flows into the condenser. A heat exchanger connected to your building&#8217;s hydronic water loop. Here, the refrigerant releases its thermal energy into the water, heating it to between 35\u00b0C and 65\u00b0C (95\u00b0F\u2013149\u00b0F) depending on system configuration. As it releases heat, the refrigerant condenses back into a liquid.<\/span><\/p><p><span style=\"font-weight: 400;\">This heated water then circulates through your radiant floors, fan coils, or domestic hot water system, delivering warmth throughout the building.<\/span><\/p><h2><b>Stage 4: Expansion &#8211; Resetting the Cycle<\/b><\/h2><p><span style=\"font-weight: 400;\">The warm liquid refrigerant passes through an expansion valve, which reduces its pressure and temperature sharply, returning it to its original cold, low-pressure liquid state. It then flows back to the evaporator, and the cycle repeats continuously.<\/span><\/p><p><b>\ud83d\udd04 Cycle Summary: <\/b><i><span style=\"font-weight: 400;\">Absorb outdoor heat (evaporate) \u2192 Compress and upgrade temperature \u2192 Release heat into water loop (condense) \u2192 Reset via expansion valve \u2192 Repeat.<\/span><\/i><\/p><h2><b>Key Components and Their Functions<\/b><\/h2><p><span style=\"font-weight: 400;\">Understanding what each component does helps you make informed decisions about system sizing, distribution design, and long-term maintenance. Here is a breakdown of every major element:<\/span><\/p><table><thead><tr><th><p><b>Component<\/b><\/p><\/th><th><p><b>Function<\/b><\/p><\/th><th><p><b>Why It Matters<\/b><\/p><\/th><\/tr><\/thead><tbody><tr><td><p><b>Evaporator<\/b><\/p><\/td><td><p><span style=\"font-weight: 400;\">Fan draws outdoor air over a refrigerant-filled heat exchanger, causing the refrigerant to absorb heat and evaporate into a gas<\/span><\/p><\/td><td><p><span style=\"font-weight: 400;\">Works at outdoor temperatures as low as -25\u00b0C \/ -13\u00b0F<\/span><\/p><\/td><\/tr><tr><td><p><b>Compressor (EVI DC Inverter)<\/b><\/p><\/td><td><p><span style=\"font-weight: 400;\">Compresses the gaseous refrigerant, dramatically raising its temperature and pressure<\/span><\/p><\/td><td><p><span style=\"font-weight: 400;\">Arctic&#8217;s EVI technology maintains efficiency in extreme cold climates<\/span><\/p><\/td><\/tr><tr><td><p><b>Condenser \/ Heat Exchanger<\/b><\/p><\/td><td><p><span style=\"font-weight: 400;\">Hot refrigerant transfers its thermal energy into the building&#8217;s water loop<\/span><\/p><\/td><td><p><span style=\"font-weight: 400;\">Heats water to 55\u00b0C\u201365\u00b0C for radiators, underfloor, or domestic hot water<\/span><\/p><\/td><\/tr><tr><td><p><b>Expansion Valve<\/b><\/p><\/td><td><p><span style=\"font-weight: 400;\">Drops refrigerant pressure and temperature, readying it for the next evaporation cycle<\/span><\/p><\/td><td><p><span style=\"font-weight: 400;\">Precision metering enables variable-speed efficiency optimization<\/span><\/p><\/td><\/tr><tr><td><p><b>Hydronic Buffer Tank<\/b><\/p><\/td><td><p><span style=\"font-weight: 400;\">Stores heated water, smoothing heat pump cycling and protecting the compressor<\/span><\/p><\/td><td><p><span style=\"font-weight: 400;\">Prevents short-cycling \u2014 critical for system longevity and efficiency<\/span><\/p><\/td><\/tr><\/tbody><\/table><p><span style=\"font-weight: 400;\">Arctic&#8217;s cold-climate heat pump models and full technical specifications are available on the <\/span><a href=\"https:\/\/www.arcticheatpumps.com\/arctic-heat-pumps-product-overview.html\"><span style=\"font-weight: 400;\">Product Overview page<\/span><\/a><span style=\"font-weight: 400;\">.<\/span><\/p><h2><b>Cold-Climate Performance: Why Standard Heat Pumps Fail &#8211; and Arctic&#8217;s Don&#8217;t<\/b><\/h2><p><span style=\"font-weight: 400;\">The most common concern about air-source heat pumps in Canada and the Northern US is cold-weather performance. This concern is valid for conventional systems but it does not apply to properly engineered cold-climate heat pumps.<\/span><\/p><h2><b>The Problem with Standard Heat Pumps Below -10\u00b0C<\/b><\/h2><p><span style=\"font-weight: 400;\">Conventional air-source heat pumps use single-stage scroll compressors with fixed capacity. As outdoor temperatures drop, the temperature differential between the refrigerant and the outdoor air narrows, reducing how much heat the evaporator can absorb. Below -10\u00b0C to -15\u00b0C, many standard systems lose a significant portion of their rated capacity and efficiency at the exact moment when heating demand is highest.<\/span><\/p><h2><b>Arctic&#8217;s EVI DC Inverter Solution<\/b><\/h2><p><span style=\"font-weight: 400;\">Arctic Heat Pumps&#8217; cold-climate models are built around enhanced vapor injection (EVI) technology combined with DC inverter-driven variable-speed compressors. This combination addresses both limitations simultaneously:<\/span><\/p><ul><li style=\"font-weight: 400;\" aria-level=\"1\"><b>EVI Mid-Injection:<\/b><span style=\"font-weight: 400;\"> Additional refrigerant vapor is injected into the compressor mid-cycle, increasing the compression ratio achievable without overheating enabling reliable heating output down to -25\u00b0C (-13\u00b0F) and operation down to -30\u00b0C.<\/span><\/li><li style=\"font-weight: 400;\" aria-level=\"1\"><b>DC Inverter Speed Control:<\/b><span style=\"font-weight: 400;\"> The compressor modulates its speed in real time, matching heating output precisely to building demand rather than cycling on and off. This maintains high COP values across a wide range of outdoor temperatures and reduces wear on compressor components.<\/span><\/li><li style=\"font-weight: 400;\" aria-level=\"1\"><b>R32 Refrigerant:<\/b><span style=\"font-weight: 400;\"> Arctic&#8217;s latest models use R32 refrigerant, which has superior thermodynamic properties in cold conditions compared to R410A, further improving low-temperature performance.<\/span><\/li><\/ul><p><span style=\"font-weight: 400;\">For a detailed analysis of how Arctic&#8217;s technology compares to geothermal, see the <\/span><a href=\"https:\/\/www.arcticheatpumps.com\/geothemal-versus-cold-climate-heat-pumps.html\"><span style=\"font-weight: 400;\">Geothermal vs Cold Climate Heat Pumps comparison<\/span><\/a><span style=\"font-weight: 400;\">.<\/span><\/p><h2><b>Air-to-Water Heat Pump vs. Alternative Heating Systems<\/b><\/h2><p><span style=\"font-weight: 400;\">To put the technology in context, here is how an air-to-water heat pump compares against the most common alternatives across North America:<\/span><\/p><table><thead><tr><th><p><b>Factor<\/b><\/p><\/th><th><p><b>Air-to-Water Heat Pump<\/b><\/p><\/th><th><p><b>Gas Boiler<\/b><\/p><\/th><th><p><b>Electric Resistance<\/b><\/p><\/th><\/tr><\/thead><tbody><tr><td><p><b>Efficiency (COP)<\/b><\/p><\/td><td><p><span style=\"font-weight: 400;\">3.0 \u2013 5.5+<\/span><\/p><\/td><td><p><span style=\"font-weight: 400;\">0.85 \u2013 0.95<\/span><\/p><\/td><td><p><span style=\"font-weight: 400;\">1.0<\/span><\/p><\/td><\/tr><tr><td><p><b>Cold Climate Performance<\/b><\/p><\/td><td><p><span style=\"font-weight: 400;\">Excellent (EVI to -25\u00b0C)<\/span><\/p><\/td><td><p><span style=\"font-weight: 400;\">Good<\/span><\/p><\/td><td><p><span style=\"font-weight: 400;\">Good<\/span><\/p><\/td><\/tr><tr><td><p><b>Carbon Emissions<\/b><\/p><\/td><td><p><span style=\"font-weight: 400;\">Very Low (grid-dependent)<\/span><\/p><\/td><td><p><span style=\"font-weight: 400;\">High<\/span><\/p><\/td><td><p><span style=\"font-weight: 400;\">Low (grid-dependent)<\/span><\/p><\/td><\/tr><tr><td><p><b>Operating Cost<\/b><\/p><\/td><td><p><span style=\"font-weight: 400;\">Low<\/span><\/p><\/td><td><p><span style=\"font-weight: 400;\">Medium\u2013High<\/span><\/p><\/td><td><p><span style=\"font-weight: 400;\">High<\/span><\/p><\/td><\/tr><tr><td><p><b>Upfront Cost<\/b><\/p><\/td><td><p><span style=\"font-weight: 400;\">Medium\u2013High<\/span><\/p><\/td><td><p><span style=\"font-weight: 400;\">Low\u2013Medium<\/span><\/p><\/td><td><p><span style=\"font-weight: 400;\">Low<\/span><\/p><\/td><\/tr><tr><td><p><b>Rebate Eligible<\/b><\/p><\/td><td><p><span style=\"font-weight: 400;\">Yes \u2014 extensive programs<\/span><\/p><\/td><td><p><span style=\"font-weight: 400;\">No<\/span><\/p><\/td><td><p><span style=\"font-weight: 400;\">Rarely<\/span><\/p><\/td><\/tr><tr><td><p><b>Heating Distribution<\/b><\/p><\/td><td><p><span style=\"font-weight: 400;\">Hydronic \/ radiant \/ fan coil<\/span><\/p><\/td><td><p><span style=\"font-weight: 400;\">Hydronic<\/span><\/p><\/td><td><p><span style=\"font-weight: 400;\">Baseboard \/ fan<\/span><\/p><\/td><\/tr><\/tbody><\/table><p><span style=\"font-weight: 400;\">The efficiency advantage is the decisive factor for most homeowners. A COP of 3.5 means the heat pump delivers 3.5 kWh of heat for every 1 kWh of electricity consumed. An effective efficiency of 350%, something no combustion system can match.<\/span><\/p><p><span style=\"font-weight: 400;\">Explore Arctic&#8217;s full range of <\/span><a href=\"https:\/\/www.arcticheatpumps.com\/cold-climate-heat-pump-overview.html\"><span style=\"font-weight: 400;\">cold-climate heat pump models<\/span><\/a><span style=\"font-weight: 400;\"> to find the right capacity for your project.<\/span><\/p><h2><b>Hydronic Distribution: How the Heat Reaches Every Room<\/b><\/h2><p><span style=\"font-weight: 400;\">An air-to-water heat pump is only as effective as its distribution system. The hydronic loop, the network of pipes, pumps, valves, and heat emitters that carry the heated water through your building must be properly designed for optimal comfort and efficiency.<\/span><\/p><h2><b>Radiant Floor Heating<\/b><\/h2><p><span style=\"font-weight: 400;\">Radiant floor systems circulate warm water through PEX tubing embedded in or below the floor surface. Because heat radiates upward from a large surface area, effective comfort is achieved at lower water temperatures (typically 35\u00b0C\u201345\u00b0C) which maximizes heat pump efficiency. Arctic Heat Pumps offers complete radiant floor design services and supplies all required hydronic components.<\/span><\/p><h2><b>Hydronic Fan Coils<\/b><\/h2><p><span style=\"font-weight: 400;\">Fan coils provide both heating and cooling from a water loop, making them the most versatile distribution option for retrofit installations. Ultra-thin models can be wall-mounted in individual rooms, enabling zone-by-zone temperature control without ductwork.<\/span><\/p><h2><b>Domestic Hot Water Integration<\/b><\/h2><p><span style=\"font-weight: 400;\">Most Arctic heat pump configurations can produce domestic hot water simultaneously with space heating, using the same refrigeration cycle. This eliminates the need for a separate water heater and can reduce water heating costs by 60 to 70% compared to electric resistance tanks.<\/span><\/p><p><span style=\"font-weight: 400;\">See how this works: <\/span><a href=\"https:\/\/www.arcticheatpumps.com\/heat-pump-domestic-hot-water.html\"><span style=\"font-weight: 400;\">Heat Pump Domestic Hot Water<\/span><\/a><span style=\"font-weight: 400;\">.<\/span><\/p><h2><b>Buffer Tanks: The Unsung Heroes of System Efficiency<\/b><\/h2><p><span style=\"font-weight: 400;\">A hydronic buffer tank is a heated water storage vessel installed between the heat pump and the distribution system. It plays three critical roles: it prevents short-cycling (the heat pump running in very short bursts, which degrades efficiency and compressor life), it absorbs demand spikes during peak usage, and it enables more stable, efficient heat pump operation by providing thermal mass in the system.<\/span><\/p><h2><b>Pairing an Air-to-Water Heat Pump with Solar Energy<\/b><\/h2><p><span style=\"font-weight: 400;\">Air-to-water heat pumps and solar PV systems are a natural pairing. When solar panels generate excess electricity during the day, that power can run the heat pump to pre-heat the buffer tank or domestic hot water cylinder, effectively storing solar energy as thermal mass \u2014 at zero marginal cost.<\/span><\/p><p><span style=\"font-weight: 400;\">In well-designed systems, solar-plus-heat-pumps can achieve effective seasonal COPs exceeding 10, with homeowners in suitable climates achieving near-zero net heating costs.<\/span><\/p><p><span style=\"font-weight: 400;\">Learn how Arctic&#8217;s systems integrate with solar: <\/span><a href=\"https:\/\/www.arcticheatpumps.com\/heat-pump-with-solar.html\"><span style=\"font-weight: 400;\">Heat Pump with Solar page<\/span><\/a><span style=\"font-weight: 400;\">.<\/span><\/p><h2><b>Rebates and Incentive Programs in Canada and the USA<\/b><\/h2><p><span style=\"font-weight: 400;\">One of the most compelling financial arguments for air-to-water heat pumps in 2026 is the extensive rebate landscape available to North American homeowners. Federal, provincial\/state, and utility programs have substantially reduced the effective upfront cost of heat pump installations.<\/span><\/p><h2><b>Canadian Programs<\/b><\/h2><ul><li style=\"font-weight: 400;\" aria-level=\"1\"><b>Canada Greener Homes Grant:<\/b><span style=\"font-weight: 400;\"> Up to $5,000 federal rebate for qualifying heat pump installations<\/span><\/li><li style=\"font-weight: 400;\" aria-level=\"1\"><b>BC Hydro \/ CleanBC:<\/b><span style=\"font-weight: 400;\"> Provincial rebates of up to $6,000 for cold-climate heat pumps in British Columbia<\/span><\/li><li style=\"font-weight: 400;\" aria-level=\"1\"><b>Efficiency Nova Scotia, Enbridge, and provincial utility programs:<\/b><span style=\"font-weight: 400;\"> Additional rebates vary by province<\/span><\/li><\/ul><p><span style=\"font-weight: 400;\">Find your applicable Canadian rebates: <\/span><a href=\"https:\/\/www.arcticheatpumps.com\/heat-pump-rebate-bc.html\"><span style=\"font-weight: 400;\">Heat Pump Rebate BC<\/span><\/a><span style=\"font-weight: 400;\"> |\u00a0<\/span><\/p><p><a href=\"https:\/\/www.arcticheatpumps.com\/air-to-water-rebate-programs.html\"><span style=\"font-weight: 400;\">Air-to-Water Rebate Programs<\/span><\/a><\/p><h2><b>US Programs<\/b><\/h2><ul><li style=\"font-weight: 400;\" aria-level=\"1\"><b>Inflation Reduction Act (IRA) Tax Credits:<\/b><span style=\"font-weight: 400;\"> Up to 30% federal tax credit on qualifying heat pump installations (2023\u20132032)<\/span><\/li><li style=\"font-weight: 400;\" aria-level=\"1\"><b>State Utility Rebates:<\/b><span style=\"font-weight: 400;\"> Programs vary widely by state like Vermont, New York, Massachusetts, and California offer particularly strong incentives<\/span><\/li><\/ul><h2><b>Sizing an Air-to-Water Heat Pump for Your Home<\/b><\/h2><p><span style=\"font-weight: 400;\">Proper sizing is the single most important factor in heat pump system performance. An undersized unit will struggle to meet peak demand; an oversized unit will short-cycle, reducing efficiency and compressor life. Both errors are costly.<\/span><\/p><p><span style=\"font-weight: 400;\">Accurate sizing requires a Manual J heat load calculation, a room-by-room analysis of your building&#8217;s thermal envelope, window areas, insulation levels, air infiltration rate, and local design temperatures. Arctic Heat Pumps offers professional heat load calculation and system design services at no additional cost.<\/span><\/p><h2><b>Rule-of-Thumb Sizing (North American Climates)<\/b><\/h2><ul><li style=\"font-weight: 400;\" aria-level=\"1\"><b>Mild climates (Pacific Northwest, Southern BC):<\/b><span style=\"font-weight: 400;\"> Approximately 30\u201340 BTU\/hr per square foot of conditioned space<\/span><\/li><li style=\"font-weight: 400;\" aria-level=\"1\"><b>Moderate climates (Ontario, Washington, Oregon, Colorado):<\/b><span style=\"font-weight: 400;\"> 40\u201355 BTU\/hr per square foot<\/span><\/li><li style=\"font-weight: 400;\" aria-level=\"1\"><b>Cold climates (Prairie provinces, Quebec, Northern US):<\/b><span style=\"font-weight: 400;\"> 55\u201380 BTU\/hr per square foot and ensure the selected model is rated to your local design temperature<\/span><\/li><\/ul><p><span style=\"font-weight: 400;\">Use Arctic&#8217;s online tool to estimate your requirements: <\/span><a href=\"https:\/\/www.arcticheatpumps.com\/heat-pump-sizing-tool.html\"><span style=\"font-weight: 400;\">Heat Pump Sizing Tool<\/span><\/a><span style=\"font-weight: 400;\">.<\/span><\/p><h2><b>Installation Overview: What to Expect<\/b><\/h2><p><span style=\"font-weight: 400;\">Installing an air-to-water heat pump system involves several interconnected scopes of work. Understanding the process helps homeowners plan timelines, coordinate trades, and set realistic expectations.<\/span><\/p><ol><li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Site Assessment &amp; Heat Load Calculation: A certified HVAC technician performs a Manual J analysis and confirms electrical service capacity.<\/span><\/li><li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Equipment Selection: Based on the heat load, design temperatures, and distribution configuration, the appropriate heat pump model and hydronic components are specified.<\/span><\/li><li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Foundation \/ Mounting: The outdoor unit is installed on a concrete pad, galvanized steel stand, or wall bracket with appropriate clearances for airflow and service access.<\/span><\/li><li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Refrigerant Piping: Not applicable for air-to-water systems the refrigerant loop is entirely self-contained within the outdoor unit. Only water piping connects the unit to the building.<\/span><\/li><li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Hydronic Piping: Insulated water piping connects the outdoor unit to the indoor buffer tank, distribution manifolds, and heat emitters.<\/span><\/li><li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Electrical Connection: A dedicated 240V circuit is required. Arctic&#8217;s cold-climate models range from 20A to 60A depending on capacity.<\/span><\/li><li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Controls &amp; Commissioning: The hydronic controller is configured for your distribution system, setpoints are established, and the system is commissioned and tested across all operating modes.<\/span><\/li><\/ol><h2><b>Conclusion: Clean, Efficient Heat &#8211; Built for North American Winters<\/b><\/h2><p><span style=\"font-weight: 400;\">Air-to-water heat pumps represent the most significant shift in residential and commercial heating technology in a generation. By exploiting the thermodynamic properties of refrigerants and the physics of the vapor compression cycle, they deliver dramatically more heat energy than they consume in electricity &#8211; and they do so reliably in the coldest climates on earth when the right technology is applied.<\/span><\/p><p><span style=\"font-weight: 400;\">Arctic Heat Pumps has spent over a decade engineering cold-climate solutions specifically for the North American market &#8211; systems that perform when outdoor temperatures drop to -25\u00b0C, integrate seamlessly with solar generation, qualify for every major rebate program, and deliver years of efficient, reliable service.<\/span><\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t<section class=\"elementor-section elementor-top-section elementor-element elementor-element-92fd199 elementor-section-boxed elementor-section-height-default elementor-section-height-default\" data-id=\"92fd199\" data-element_type=\"section\" data-e-type=\"section\" data-settings=\"{&quot;jet_parallax_layout_list&quot;:[]}\">\n\t\t\t\t\t\t<div class=\"elementor-container elementor-column-gap-default\">\n\t\t\t\t\t<div class=\"elementor-column elementor-col-100 elementor-top-column elementor-element elementor-element-68aa282\" data-id=\"68aa282\" data-element_type=\"column\" data-e-type=\"column\">\n\t\t\t<div class=\"elementor-widget-wrap elementor-element-populated\">\n\t\t\t\t\t\t<div class=\"elementor-element elementor-element-b6fe723 elementor-widget elementor-widget-heading\" data-id=\"b6fe723\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<h2 class=\"elementor-heading-title elementor-size-default\">Frequently Asked Questions<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t<section class=\"elementor-section elementor-top-section elementor-element elementor-element-b62b83e elementor-section-boxed elementor-section-height-default elementor-section-height-default\" data-id=\"b62b83e\" data-element_type=\"section\" data-e-type=\"section\" data-settings=\"{&quot;jet_parallax_layout_list&quot;:[]}\">\n\t\t\t\t\t\t<div class=\"elementor-container elementor-column-gap-default\">\n\t\t\t\t\t<div class=\"elementor-column elementor-col-100 elementor-top-column elementor-element elementor-element-d87ebf1\" data-id=\"d87ebf1\" data-element_type=\"column\" data-e-type=\"column\">\n\t\t\t<div class=\"elementor-widget-wrap elementor-element-populated\">\n\t\t\t\t\t\t<div class=\"elementor-element elementor-element-4e07fa0 elementor-widget elementor-widget-accordion\" data-id=\"4e07fa0\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"accordion.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t<div class=\"elementor-accordion\">\n\t\t\t\t\t\t\t<div class=\"elementor-accordion-item\">\n\t\t\t\t\t<h3 id=\"elementor-tab-title-8181\" class=\"elementor-tab-title\" data-tab=\"1\" role=\"button\" aria-controls=\"elementor-tab-content-8181\" aria-expanded=\"false\">\n\t\t\t\t\t\t\t\t\t\t\t\t\t<span class=\"elementor-accordion-icon elementor-accordion-icon-left\" aria-hidden=\"true\">\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<span class=\"elementor-accordion-icon-closed\"><i class=\"fas fa-plus\"><\/i><\/span>\n\t\t\t\t\t\t\t\t<span class=\"elementor-accordion-icon-opened\"><i class=\"fas fa-minus\"><\/i><\/span>\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t<\/span>\n\t\t\t\t\t\t\t\t\t\t\t\t<a class=\"elementor-accordion-title\" tabindex=\"0\">Can an air-to-water heat pump work in temperatures below -20\u00b0C?<\/a>\n\t\t\t\t\t<\/h3>\n\t\t\t\t\t<div id=\"elementor-tab-content-8181\" class=\"elementor-tab-content elementor-clearfix\" data-tab=\"1\" role=\"region\" aria-labelledby=\"elementor-tab-title-8181\"><p><span style=\"font-weight: 400;\">Yes, Arctic&#8217;s EVI cold-climate models are rated to maintain useful heating output down to -25\u00b0C (-13\u00b0F) and can operate (with reduced capacity) to -30\u00b0C. This covers virtually all inhabited locations across Canada and the Northern United States.<\/span><\/p><\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t\t\t<div class=\"elementor-accordion-item\">\n\t\t\t\t\t<h3 id=\"elementor-tab-title-8182\" class=\"elementor-tab-title\" data-tab=\"2\" role=\"button\" aria-controls=\"elementor-tab-content-8182\" aria-expanded=\"false\">\n\t\t\t\t\t\t\t\t\t\t\t\t\t<span class=\"elementor-accordion-icon elementor-accordion-icon-left\" aria-hidden=\"true\">\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<span class=\"elementor-accordion-icon-closed\"><i class=\"fas fa-plus\"><\/i><\/span>\n\t\t\t\t\t\t\t\t<span class=\"elementor-accordion-icon-opened\"><i class=\"fas fa-minus\"><\/i><\/span>\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t<\/span>\n\t\t\t\t\t\t\t\t\t\t\t\t<a class=\"elementor-accordion-title\" tabindex=\"0\">What is COP, and what COP should I expect?<\/a>\n\t\t\t\t\t<\/h3>\n\t\t\t\t\t<div id=\"elementor-tab-content-8182\" class=\"elementor-tab-content elementor-clearfix\" data-tab=\"2\" role=\"region\" aria-labelledby=\"elementor-tab-title-8182\"><p><span style=\"font-weight: 400;\">COP (Coefficient of Performance) is the ratio of heat energy output to electrical energy input. A COP of 3.5 means 3.5 kWh of heat is delivered per 1 kWh of electricity consumed. Arctic&#8217;s models achieve seasonal COPs of 3.0 to 4.5+ depending on climate, distribution temperature, and system design. Compare this to a gas boiler&#8217;s effective efficiency of 0.85\u20130.95<\/span><\/p><\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t\t\t<div class=\"elementor-accordion-item\">\n\t\t\t\t\t<h3 id=\"elementor-tab-title-8183\" class=\"elementor-tab-title\" data-tab=\"3\" role=\"button\" aria-controls=\"elementor-tab-content-8183\" aria-expanded=\"false\">\n\t\t\t\t\t\t\t\t\t\t\t\t\t<span class=\"elementor-accordion-icon elementor-accordion-icon-left\" aria-hidden=\"true\">\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<span class=\"elementor-accordion-icon-closed\"><i class=\"fas fa-plus\"><\/i><\/span>\n\t\t\t\t\t\t\t\t<span class=\"elementor-accordion-icon-opened\"><i class=\"fas fa-minus\"><\/i><\/span>\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t<\/span>\n\t\t\t\t\t\t\t\t\t\t\t\t<a class=\"elementor-accordion-title\" tabindex=\"0\">Does an air-to-water heat pump also provide cooling?<\/a>\n\t\t\t\t\t<\/h3>\n\t\t\t\t\t<div id=\"elementor-tab-content-8183\" class=\"elementor-tab-content elementor-clearfix\" data-tab=\"3\" role=\"region\" aria-labelledby=\"elementor-tab-title-8183\"><p><span style=\"font-weight: 400;\">Yes, most Arctic air-to-water models can operate in reverse, chilling the water loop for radiant floor cooling or fan coil cooling. Radiant cooling requires careful dew point management to prevent condensation; Arctic&#8217;s hydronic controllers include integrated dew point protection.<\/span><\/p><\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t\t\t<div class=\"elementor-accordion-item\">\n\t\t\t\t\t<h3 id=\"elementor-tab-title-8184\" class=\"elementor-tab-title\" data-tab=\"4\" role=\"button\" aria-controls=\"elementor-tab-content-8184\" aria-expanded=\"false\">\n\t\t\t\t\t\t\t\t\t\t\t\t\t<span class=\"elementor-accordion-icon elementor-accordion-icon-left\" aria-hidden=\"true\">\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<span class=\"elementor-accordion-icon-closed\"><i class=\"fas fa-plus\"><\/i><\/span>\n\t\t\t\t\t\t\t\t<span class=\"elementor-accordion-icon-opened\"><i class=\"fas fa-minus\"><\/i><\/span>\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t<\/span>\n\t\t\t\t\t\t\t\t\t\t\t\t<a class=\"elementor-accordion-title\" tabindex=\"0\">What water temperature can an air-to-water heat pump produce?<\/a>\n\t\t\t\t\t<\/h3>\n\t\t\t\t\t<div id=\"elementor-tab-content-8184\" class=\"elementor-tab-content elementor-clearfix\" data-tab=\"4\" role=\"region\" aria-labelledby=\"elementor-tab-title-8184\"><p><span style=\"font-weight: 400;\">Standard cold-climate models produce water temperatures of 45\u00b0C to 55\u00b0C (113\u00b0F to 131\u00b0F) at typical operating conditions. Arctic&#8217;s high-temperature heat pump models can produce outlet temperatures up to 65\u00b0C (149\u00b0F), enabling direct replacement of gas boilers in systems designed for higher-temperature radiators.<\/span><\/p><\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t\t\t<div class=\"elementor-accordion-item\">\n\t\t\t\t\t<h3 id=\"elementor-tab-title-8185\" class=\"elementor-tab-title\" data-tab=\"5\" role=\"button\" aria-controls=\"elementor-tab-content-8185\" aria-expanded=\"false\">\n\t\t\t\t\t\t\t\t\t\t\t\t\t<span class=\"elementor-accordion-icon elementor-accordion-icon-left\" aria-hidden=\"true\">\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<span class=\"elementor-accordion-icon-closed\"><i class=\"fas fa-plus\"><\/i><\/span>\n\t\t\t\t\t\t\t\t<span class=\"elementor-accordion-icon-opened\"><i class=\"fas fa-minus\"><\/i><\/span>\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t<\/span>\n\t\t\t\t\t\t\t\t\t\t\t\t<a class=\"elementor-accordion-title\" tabindex=\"0\">How does an air-to-water heat pump differ from a ground source (geothermal) heat pump?<\/a>\n\t\t\t\t\t<\/h3>\n\t\t\t\t\t<div id=\"elementor-tab-content-8185\" class=\"elementor-tab-content elementor-clearfix\" data-tab=\"5\" role=\"region\" aria-labelledby=\"elementor-tab-title-8185\"><p><span style=\"font-weight: 400;\">Both use the same refrigeration cycle. The difference is the heat source: a ground-source heat pump extracts heat from the earth via buried loops or wells, while an air-to-water heat pump extracts it from outdoor air. Air-source systems cost significantly less to install (no ground loop required) while modern EVI cold-climate systems have closed the performance gap considerably, especially for moderate climates.<\/span><\/p><\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t\t\t<div class=\"elementor-accordion-item\">\n\t\t\t\t\t<h3 id=\"elementor-tab-title-8186\" class=\"elementor-tab-title\" data-tab=\"6\" role=\"button\" aria-controls=\"elementor-tab-content-8186\" aria-expanded=\"false\">\n\t\t\t\t\t\t\t\t\t\t\t\t\t<span class=\"elementor-accordion-icon elementor-accordion-icon-left\" aria-hidden=\"true\">\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<span class=\"elementor-accordion-icon-closed\"><i class=\"fas fa-plus\"><\/i><\/span>\n\t\t\t\t\t\t\t\t<span class=\"elementor-accordion-icon-opened\"><i class=\"fas fa-minus\"><\/i><\/span>\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t<\/span>\n\t\t\t\t\t\t\t\t\t\t\t\t<a class=\"elementor-accordion-title\" tabindex=\"0\">Do I need a backup heating source?<\/a>\n\t\t\t\t\t<\/h3>\n\t\t\t\t\t<div id=\"elementor-tab-content-8186\" class=\"elementor-tab-content elementor-clearfix\" data-tab=\"6\" role=\"region\" aria-labelledby=\"elementor-tab-title-8186\"><p><span style=\"font-weight: 400;\">Most properly sized cold-climate heat pump installations do not require backup heat for the vast majority of the heating season. For extreme design temperatures or highly inefficient building envelopes, a modestly sized electric boiler backup can be added to cover the small number of hours per year when the heat pump alone may be insufficient. Arctic offers integrated electric boiler options for seamless backup integration.<\/span><\/p><\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t<\/div>\n\t\t","protected":false},"excerpt":{"rendered":"<p>The Technology Powering North America&#8217;s Heating Revolution Air-to-water heat pumps are rapidly replacing gas boilers and electric resistance heaters across Canada and the United States for a good reason. They can deliver 3 to 5.5 units of heat energy for every unit of electricity consumed, making them the most efficient heating technology available for residential [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":2343,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[324],"tags":[],"class_list":["post-2341","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-air-to-water-heat-pumps"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.6 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>How Do Air-to-Water Heat Pumps Work? 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