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What Is an Air-to-Water Heat Pump?

A key part of our air-cooled chiller portfolio, these heat pumps achieve reliable year-round cooling and heating by transferring energy between their internal fluid and the outside air. With their refrigerant reversing valves, they’re able to switch between cooling and heating modes as needed based on outdoor temperatures or your preferences.

Both effective and affordable, an air-to-water heat pump system doesn’t need to be overly complex to successfully operate. Trane can deliver design concepts and control sequences that are highly flexible, reliable and efficient today and tomorrow.


Surpass Efficiency and Environmental Needs. Optimizing your operations to use less energy can power better outcomes:

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    Improve efficiency by three times more than other forms of electric heating

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    Help support sustainability goals and decarbonization demands by reducing emissions

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    Comply with strict climate regulations and capitalize on financial incentives

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    Achieve reliable year-round comfort control

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    Effective and Quiet

    Designed to improve efficiency with less sound, few costs and compatibility with almost any building code.

  • Modern Electronics Factory: Female Supervisor Talks to a Male Electrical Engineer who Works on Computer with CAD Software. Developing PCB, Microchips, Semiconductors and Telecommunications Equipment

    Well-Built Design

    Built to last and provide consistent quality and outcomes

  • Chief Engineer in the Hard Hat Walks Through Light Modern Factory While Holding Laptop. Successful, Handsome Man in Modern Industrial Environment.

    Tested to Work

    Both options pass extensive lab verification processes


Air-to-Water Heat Pumps

Trane offers an industry-leading combination of expertise and serviceability for different all-electric air-to-water heat pump options (packaged or modular) that reverse the vapor compression cycle to help provide energy-efficient cooling or heating for commercial buildings.

Shared Features:

  • Effectively heat commercial buildings with outdoor ambient temperatures as low as 0°F
  • Can provide 3x more energy efficiency than other forms of electric heating
  • Feature quiet, variable speed fans
  • Pass rigorous lab verification
  • Available with R-454B low global warming potential refrigerants
Thermafit™ Modular Air-to-Water Heat Pumps

Model AXM

Electrify effortlessly with this model’s compact size and vapor injection technology that’s ideal for limited spaces in colder climates.

  • 30-ton units are expandible to create 300-ton banks; 390 MBh heating
  • Modular banks available with 2 to 10 modules
  • Vapor injection enables leaving hot water temperatures of approximately 130°F at 0°F outdoor ambient temperature
  • Provide fluid temperatures up to 140°F
Ascend® Air-to-Water Heat Pumps

Model ACX

The next evolution in Trane's proven Ascend chiller line, this model offers low sound, high energy efficiency and dependable all-electric performance.

  • 140 to 230-ton cooling capacity; 1500 to 2500 MBh heating
  • Meets ASHRAE® 90.1 efficiency targets
  • Reliable heating down to 0°F ambient
  • Ability to provide fluid temperatures up to 140°F
  • Advanced defrost management

Comprehensive Chiller-Heater Systems

Both ACX and AXM heat pumps are part of our Comprehensive Chiller-Heater Systems. Now you can deliver effective, electrified heating solutions with best-in-class equipment and controls, delivered with Trane’s application expertise and system design guidance for virtually any building.


Chillers enabled with heat recovery are extremely energy efficient and provide the first step to electrification of heat.

Electrification of Heat

Explore our expanded portfolio of equipment, systems, controls and services for electrifying heating and cooling

Contact Us for Expert Guidance