Air to Water Heat Pumps

Install a high-efficiency heat pump—and get up to $16,000 back.
An air to water heat pump system

Air to water heat pumps can provide a total solution for heating, cooling, and hot water supply in a home.

Air to water heat pumps use the same concept as an air source heat pump for drawing out heat from the outdoor air. The difference is it delivers the heat via water piped through a home (rather than hot air).

Residents can also take advantage of federal tax credits to lower the price of purchasing and installing an air to water heat pump. Greater discounts and no-cost options are also available to income-qualifying customers.

Air to Water Heat Pump Rebates
Equipment Type Efficiency Requirements Rebate Amount Enhanced Amount
Air to Water Heat Pump Refer to  $10,000 per home $16,000 per home

*The Sponsors of Mass Save offer enhanced incentives for income-qualified households. Pre-existing fuel type must be oil, propane, or electric resistance. Cape Light Compact enhanced heat pump rebates differ from the amount listed. Customers are eligible for 80% of the installed cost of qualifying heat pump systems.

  1. Confirm Eligibility
    View the Eligibility Tab to confirm the eligible requirements. The Sponsors of Mass Save offer enhanced incentives to income-qualified households.
    If you are a Cape Light residential customer, please call 1-800-797-6699.
  2. Ensure Your Home Has Sufficient Weatherization
    View the Eligibility Tab for additional details. This is a requirement for whole-home rebates and may qualify customers pursuing partial-home rebates for a $500 bonus.
  3. Find a Qualifying Contractor
    To qualify, the heat pump system must be installed by a contractor participating in the Mass Save Heat Pump Installer Network. The contractor can help you determine what solution is best suited for your home.
  4. Purchase & Install Eligible Equipment
    Work with your contractor to purchase and install an eligible heat pump system.

    If pursuing a partial-home heat pump, an integrated control from the Mass Save Integrated Control Qualified Product List must be installed for heating zones where propane, oil, or natural gas will remain in use.

    If installing a whole-home heat pump, you must also satisfy all requirements listed on the Whole-Home Heat Pump Verification Form.
  5. Submit Rebate Form with Required Documentation
    Apply Online
    Print & Mail Rebate Form 
  • Offers valid only for residential customers replacing oil, propane, or electric resistance heating systems where Cape Light Compact, Eversource, National Grid, or Unitil is the Mass Save Electric Sponsor
  • Offers valid only for residential customers replacing natural gas heating systems where Berkshire Gas, Eversource, Liberty Utilities, National Grid, or Unitil is the Mass Save Natural Gas Sponsor
  • Equipment must be installed between January 1, 2024 and December 31, 2024 by a contractor participating in the Mass Save Heat Pump Installer Network
  • Equipment must be listed on the Mass Save Heat Pump Qualified Products List for a complete list of eligible units
  • Equipment must be new and installed to displace oil, propane, natural gas, or electric baseboard (resistance) as the primary heating system
  • Whole-Home Rebates: Homes must be sufficiently weatherized prior to heat pump installation and a Whole-Home Heat Pump Verification Form must be completed and signed.
  • Rebate form and supporting documentation must be received by February 28, 2025.

Please note, this rebate is only available to residences that are occupied full time during the winter heating season. Equipment must be installed in individually metered 1-4 unit buildings or townhouses to receive the whole-home rebate. Rebate cannot be combined with other Mass Save incentives for the same equipment. Rebate amount not to exceed total installation cost. Sponsor reserves the right to conduct a verification inspection prior to rebate payment. Please allow eight weeks for rebate processing. Sponsor does not warrant the performance of installed equipment. See Terms and Conditions for full requirements.

  1. Customers in municipal electric territories are eligible for heat pump rebates if they are a natural gas heating customer of one of the Sponsors of Mass Save. Customers with municipal gas heating are not eligible for heat pump rebates. 
  2. Sufficient weatherization can be demonstrated by satisfying at least one of the following requirements: (A) home was built during or after 2000, (B) Home Energy Assessment report indicates less than $1,000 worth of weatherization recommended, or (C) weatherization recommendations made during or after 2013 have been completed. Heat pumps installed for whole-home heating and cooling that do not meet the weatherization requirement may be eligible for partial-home rebate amounts.  

If you have any questions, please call 1-888-855-0340 or email [email protected].

The Sponsors of Mass Save offer 0% financing HEAT Loans to make energy efficiency upgrades more affordable to Massachusetts residents. Through this loan, you could qualify for a loan up to $50,000 toward qualified home improvements.
A person on the phone with an energy specialist

​​​Not Sure Where to Start?

Schedule a no-cost, virtual consultation with a Mass Save Decarbonization Specialist for guidance. You can also use our Heating Comparison Calculator to compare the annual costs and savings of different systems.

An energy efficient heat pump in Massachusetts

Case Study: Dick MacDonough

After an existing central air conditioner unit broke down, Dick decided to upgrade to a high-efficiency heat pump and use a smart thermostat—reducing his annual carbon dioxide emissions by 5.1 metric tons.

An energy efficient home in Massachusetts

Case Study: All-Electric Home in Acton

When setting out to build a new home, homeowners in Acton wanted a high level of energy efficiency and a low carbon footprint. With a ducted heat pump, heat pump water heater, solar array, and battery storage, these homeowners have an annual electric savings of 9,595 kWh.