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Rebate Guide

Massachusetts Air Sealing Rebates

Air sealing and insulation are typically done together through Mass Save. Coverage can reach 75–100% of project cost.

High confidenceLast checked: April 20251 official source
Quick Answer

How much does Mass Save cover for air sealing in Massachusetts?

Massachusetts homeowners may have 75–100% of air sealing costs covered through Mass Save, typically as part of a combined insulation and air sealing scope. A no-cost Home Energy Assessment is required to identify what work is needed and unlock the rebate. Eligibility depends on your utility, home type, and whether previous weatherization work has been completed. Air sealing is often a prerequisite for accessing the highest heat pump rebate tiers through Mass Save.

Insulation rebates Heat pump calculator
Why it matters before a heat pump

Air sealing prevents conditioned air from escaping through gaps in the building envelope. For heat pumps, a well-sealed home means smaller required equipment, better efficiency, and more even comfort. Mass Save often recommends air sealing before or alongside heat pump installation — and may require it for the whole-home rebate path.

Reduces heat loss — a well-sealed home needs a smaller, less expensive heat pump
Improves heat pump efficiency by reducing infiltration load
Often done in the same contractor visit as insulation — no separate scheduling
Covered at 75–100% through Mass Save — lower net cost than most upgrades
Qualifies for 30% federal 25C tax credit (up to $1,200/year) alongside insulation
How to access air sealing rebates
1
Schedule a no-cost Home Energy Assessment
Contact your utility or the Mass Save website. The assessment identifies air sealing and insulation opportunities and confirms your eligibility.
2
Work with a Mass Save participating contractor
Air sealing and insulation must be done by an approved contractor. Your assessor will typically provide a referral.
3
Rebate applied to project cost
The rebate reduces your out-of-pocket cost directly — typically at time of service. Your contractor handles the paperwork.
Source-backedMassachusettsLast reviewed: April 2025
Program:Mass Save is administered by participating Massachusetts utilities (Eversource, National Grid, Unitil, Cape Light Compact) under Massachusetts Department of Public Utilities oversight. Rebate tiers and eligibility criteria vary by utility.
Federal:IRS 25C (heat pumps, insulation) and 25D (battery storage) tax credits apply to many Mass Save-eligible upgrades and are generally stackable with state rebates. Verify with a tax professional.

Not a government website. Not affiliated with Mass Save, any Massachusetts utility, the IRS, or any state agency. Rebate program rules, tiers, and amounts change without notice — always verify current eligibility with your utility or the Mass Save website before treating any estimate as confirmed.

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