CMLP Rebates

* Tons are calculated based on AHRI cooling capacity divided by 12,000 BTUs.

**Heat pumps must be new and capable of being the sole source of heating for the residence. The definition of "sole source" can be found in the "Additional Requirements for Whole Home Heat Pump Projects" section, and includes sizing parameters and some restrictions on the use of supplemental and emergency heat. Whole-home heat pump verification form must be signed and submitted with rebate application. 

Rebate Application Deadline:

CMLP's 90-day rebate application window begins on the later of the Concord Building Department's electrical inspection approval date or sheet metal inspection approval date (applicable if the project requires sheet metal ducting work that goes beyond minor repairs). Projects for which CMLP does not receive a rebate application within the 90-day window are not eligible for a rebate.

Rebate Caps:

Rebate not to exceed project cost.

A customer is eligible for the following maximum rebate per service address per calendar year for equipment installed in that calendar year. A service address is the physical address at which electricity is provided. The equipment installation date is the later of the Concord Building Department's electrical inspection approval date or sheet metal inspection approval date (applicable if the project requires sheet metal ducting work that goes beyond minor repairs).

- $10,000 in air source heat pump or air-to-water heat pump rebates or

- $15,000 in ground source heat pump rebates or

- $15,000 in rebates if a combination of air source and ground source heat pumps are installed

If a property is sold, the new account holder’s cap resets at $10,000 (ASHP or AWHP) or $15,000 (GSHP) per service address per calendar year, regardless of rebates awarded to previous account holders.

Rebate cannot be combined with a National Grid/Mass Save rebate for the same equipment.

Rebate Eligibility for Multi-Unit Properties

Multi-unit properties include:

• residential condominium complexes
• single family homes with informal apartments
• 2 or 3 family homes
• Multiple houses on one parcel
• Properties with outbuildings, where heat pump is to be installed in the outbuilding
• Apartment buildings with 4 or more units
• Transient or non-transient group quarters

 The way in which CMLP applies its heat pump rebate policy to different types of multi-unit properties is based upon:

• Property type classification codes known as “Use Codes,” that are displayed in the “Land Use” section of each property record in the Concord Assessor’s database. 
• Electric service addresses in CMLP’s billing system. 

 Click here to see how CMLP’s heat pump rebate policies apply to each of the multi-unit property types listed above.  

Rebate Eligibility for New Construction

See the next section: "Eligibility Criteria for All Heat Pump Projects," for information on rebate eligibility for new construction.

Rebate Eligibility for Ground Source Heat Pumps that Share a Geothermal Well

A ground source heat pump sharing a geothermal well with another ground source heat pump serving a different building is not eligible for a rebate from CMLP.

State Incentives

• New England Heat Pump Accelerator Pass-Through Incentives
  • Concord residents in existing single family or two- to four-unit homes are eligible for pass-though incentives offered by the New England Heat Pump Accelerator, if your heat pump installer provides your name, address, phone number and email to a participating distributor upon purchase of the heat pump equipment for your home.  The incentive is $650 per outdoor condenser, up to 2 condensers per address. The distributor discounts the sale price by the amount of the incentive, and the installer passes the incentive through to you as a credit on your invoice. 
  • Look for the New England Heat Pump Accelerator Pass-Through Incentive on quotes you receive from potential installers, and on the invoice you receive from the installer you select. If you don't see the incentive line item, ask the installer about it.  Learn more about the incentive here. You are eligible for this incentive in addition to CMLP's heat pump rebate. 
  • Households that switch from natural gas heating to heat pump heating are eligible for Mass Save's heat pump rebate (but not CMLP's rebate) and the New England Heat Pump Accelerator Pass-Through Incentive. 
  • The incentive is currently available for air-source heat pumps, and should also become available for ground-source heat pumps in June 2026.
• Massachusetts Alternative Energy Credits (AECs)
  • For whole home heat pumps (where the home is heated exclusively with heat pumps). AECs are bought and sold, so their price fluctuates. The state suggests finding a broker who can procure and sell your credits for a fee. Click here for more information on AECs and brokers.