Frequently asked questions

What is Mass Save®?

Mass Save is an initiative sponsored by Massachusetts’ natural gas and electric utilities and energy efficiency service providers, including Berkshire Gas Company, Cape Light Compact, Eversource, Liberty, National Grid, and Unitil. The Sponsors of Mass Save work closely with the Massachusetts Department of Energy Resources to provide a wide range of services, incentives, trainings, and information promoting energy efficiency that help residents and businesses manage energy use and related costs.

How is the Mass Save program funded?

The Mass Save Program is funded by the energy efficiency charge on all customers’ gas and electric bills.

What are the qualifications of the Energy Specialist who will complete my home energy assessment?

All Mass Save Energy Specialists are certified as “Building Analysts” by the Building Performance Institute (BPI), the nation's premier credentialing, quality assurance, and standards setting organization for home performance professionals.

Can I get my work inspected after it has been completed?

Yes, quality assurance inspections on weatherization installations are offered at no cost and we encourage you to request an inspection by calling 1-866-527-SAVE (7283). The program also conducts third-party random inspections of both weatherization work and home energy assessments for quality control purposes. These are separate inspections from any that may be required by local municipal building codes.

How are my energy efficiency recommendations determined?

Building science standards, set by the Building Performance Institute (BPI), are used as the framework for all recommendations that are made as part of the home energy assessment. During the assessment, the Energy Specialist uses a whole-house approach to evaluate the residence, including a review of the building’s heating, cooling, and water heating systems, lighting, thermal envelope (insulation and air sealing), and appliances.

Which prices are set by the Mass Save Program, and which prices are open-market?

Pricing for air sealing and insulation improvements is set by the utilities and energy efficiency service providers who sponsor Mass Save. Pricing for weatherization will remain the same regardless of the contractor you use for qualified improvements.

Home Performance Contractors may also offer recommendations for additional energy related equipment or services priced at their own discretion. These services, if provided by the Contractor, may require additional payment and are at pricing that is agreed upon between the customer and the contractor. Pricing is NOT set by Mass Save for the following services: heating systems, water heating systems, air conditioning systems, solar systems, heat pumps, siding, roofing, and windows.

How do participating Independent Installation Contractors and Home Performance Contractors qualify to be a part of the Mass Save Program?

Mass Save works with certified Home Performance Contractors (HPCs) and Independent Installation Contractors (IICs) to provide high-quality Home Energy Assessments and insulation and air sealing installations. All HPCs and IICs have met training and certification requirements to be eligible to work within the Home Energy Services Program.

Can I choose my own contractor to install my recommended air sealing and/or insulation work?

You may elect to have a contractor assigned to you, or choose from our list of Mass Save certified Independent Installation Contractors by visiting

How do I apply for rebates that are recommended for my home?

To apply for rebates based on the recommendations determined during your assessment, visit You can apply online or by mail.