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MA Rebate Checker
MASSACHUSETTS
Rebate Guide

Massachusetts Insulation Rebates

Mass Save may cover 75–100% of insulation costs for eligible Massachusetts homes. Here's what's covered, how to access it, and why insulation often comes before a heat pump.

High confidenceLast checked: April 20252 official sources
Quick Answer

How much does Mass Save cover for insulation?

Mass Save typically covers 75% to 100%of insulation costs for eligible Massachusetts homeowners, depending on your utility, home type, and income band. A no-cost Home Energy Assessment is required first to identify what's needed and unlock the rebate. Insulation and air sealing are often done together and may significantly reduce heating and cooling costs.

What insulation types are covered?

Attic insulation
Most common and highest-impact measure
75–100% of cost
Basement or crawlspace insulation
Often bundled with air sealing
75–100% of cost
Wall insulation (dense-pack)
Varies by utility and home type
75% of cost typical
Air sealing
Typically done with insulation
75–100% of cost
Knee walls and rim joists
Part of comprehensive weatherization scope
75–100% of cost
Why insulation should come first

Insulate before you install a heat pump

A well-insulated home requires a smaller, less expensive heat pump system — saving money on both the equipment and the rebate application. Insulation is often covered at 75–100% through Mass Save, making it one of the highest-ROI first steps a Massachusetts homeowner can take.

Reduces required system size (saves $1,000–$5,000 on heat pump cost)
Improves heat pump efficiency and comfort
Often required before accessing whole-home heat pump rebate path
Qualifies for federal 25C credit (30%, up to $1,200/year) in addition to Mass Save

How to access insulation rebates

1
Schedule a no-cost Home Energy Assessment
Contact your utility or use the Mass Save website to book an assessment. This is required for most insulation rebates.
2
Receive your home assessment report
The assessor will identify opportunities and confirm what rebates you're eligible for.
3
Choose a Mass Save participating contractor
Work must be done by an approved contractor to qualify for rebates.
4
Rebate is applied at time of service or via mail-in
Rebate application process varies by utility. Your contractor typically handles this.
Air sealing rebates Insulation vs heat pump first? Heat pump calculator
High confidenceLast checked: April 20252 official sources linked

Not a government website. Rebate rules can change — always verify eligibility with your utility or contractor before assuming you qualify.

Official Sources
Apr 2025
Apr 2025