Benefits of Weatherization

Air-sealing and insulating your home helps you reduce overall energy consumption. ​

Lower greenhouse gas emissions

Protect the climate by using less energy

Cost competitive

Save money on monthly heating and cooling costs​


Increase comfort by reducing drafts and uneven temperatures​

Lower energy demand

Buy a smaller, less expensive heating or cooling system next time you need to replace it​

The Technology

How It Works

Diagram illustrating ways to weatherize your home

Air-sealing your home, and sealing and insulating ductwork, ensures that there are as few gaps as possible for indoor hot air to escape and cold outdoor air to get in. This reduces the heating load in a home. Adding insulation is another important step: it slows heat transfer from the inside of your house to the outside. Think of air-sealing as patching up holes in your clothing, and insulation as the addition of a nice warm winter jacket. It’s cozy—and efficient.


Weatherization and Home Energy Assessment from Eversource

Eversource | 1 min. 46 sec.

A couple describes their experience weatherizing their home. The result: “We have a house that is much less drafty, much less humid, so we are much more comfortable in the house than we were before.”


Window Air Sealing Techniques

Ask This Old House | 5 min. 42 sec.

The This Old House team explains different insulating techniques, including shrink wrap, weather stripping, and caulk. Anything you can do to decrease airflow and leakage will drastically increase comfort and energy savings.

Incentives and Financing

Mass Save logo

Mass Save®

FREE Home Energy Assessment​:
75%–100% off insulation, air sealing, and weather stripping and​ $75/window rebate for replacing single pane windows with triple pane windows.

Federal Tax Credits

Inflation Reduction Act: Federal tax credit of 30% up to $1,200/year.

Federal Rebates

Inflation Reduction Act: Up to $1,600 depending on your household size and income.

Financing Options

Mass Save® HEAT LoanUp to $25,000 at 0% interest over terms of up to 7 years. 

Example Cost for a 2,000 FT2 Home

Cost after incentives is estimated by applying Mass Save incentive of 75% off weatherization and Federal Tax Credit.
Through Mass Save, the cost after incentives may be substantially lower if:
– Your household is income-qualified.
– Your home is in a 1-4 unit building where all the owners agree to have the building and units weatherized as part of the same project.

Example up-front cost before incentives


Example cost after


Things to Consider

If you answer yes to ANY of these questions, weatherization is a good fit for your home​

Because your home ages and Mass Save is able to provide more efficiency and electrification solutions than in the past, it’s a good idea to have your home evaluated periodically. For residents within its service territory, the Mass Save program offers home energy assessments every 3 years free of charge.

Temperature variations within your home may be a symptom of incomplete air sealing and/or insulation.

Single pane windows are much less energy efficient than double- or triple-pane windows.

Doors often leak air where the door meets the door frame. Weatherstripping can block this air flow.

Knee walls are short walls on the top floor that support the roof rafters for a pitched roof. When they aren’t insulated it’s difficult to keep the adjacent living space comfortable in extreme temperatures.

Icicles are a symptom of ice dams, which are caused by uneven melting of snow on your roof. A well-insulated attic will reduce the likelihood of ice dams, which also cause roof leaks.


View full collection of Resources >>

To schedule a home energy assessment and/or pick a home performance contractor, choose a provider that serves your electric utility.
Mass Save® | Energy New England | NextZero

Air-source heat pump installer testing a heat pump system

Cut heating costs and emissions with an air-source heat pump

We’re In This Together

Pledge to reduce your home’s carbon footprint by replacing old systems and appliances with clean energy technologies over time.

Join the Clean Energy Transformation

Let's work together to reduce greenhouse gas emissions from our homes and build a clean energy future for Massachusetts.