Souzet · Insulation Division Souzet · Heat Pumps Division
Home/Holliston

Insulation Contractor in Holliston MA

Cold upstairs rooms, drafty floors and high heating bills can point to air leaks or missing insulation. Souzet is a Holliston-based Home Performance Contractor participating in the Mass Save program. From our Washington Street office, we help local homeowners assess their homes, complete recommended insulation and air sealing work, and navigate available incentives. We also seal and insulate ductwork when those improvements are part of the plan.

Mass Save for Eversource and National Grid Customers

Eversource and National Grid are Sponsors of Mass Save. If your Holliston home is served by either utility, Souzet can help you start with a no-cost Home Energy Assessment and find out which improvements and incentives apply. We review the home and the program requirements, then explain the recommended work and estimated cost before you decide. Eligibility and incentive amounts depend on your home, utility account and current program terms.

Souzet team at its Holliston facility
Souzet is based on Washington Street in Holliston.

Insulation, air sealing and duct services in Holliston

Attic Insulation for Holliston Homes

An under-insulated attic can make the second floor uncomfortable in every season and contribute to winter heat loss. We check existing insulation during the assessment, seal accessible air leaks and recommend attic insulation where it will help. Mass Save incentives may cover 75% to 100% of approved insulation costs, depending on eligibility. Your assessment will show what applies to your home.

Air Sealing Before Insulation

Insulation works best when hidden air leaks are addressed first. We look for gaps around attic hatches, plumbing and wiring penetrations, and rim joists, then seal the accessible areas identified in the assessment. This can help reduce drafts and make rooms easier to keep comfortable. Recommended air sealing is typically completed at no cost after a qualifying Mass Save assessment.

Basement and Wall Insulation for Holliston Homes

Cold floors and hard-to-heat rooms can be signs of insulation gaps below or around the living space. Depending on the home, Souzet can insulate rim joists, basement walls, crawlspaces and exterior walls. The assessment identifies the right areas to address and whether the proposed work qualifies for Mass Save incentives.

Duct Sealing and Duct Insulation for Forced Air Systems

When ducts run through an attic, basement or crawlspace, leaks and uninsulated sections can waste heated or cooled air before it reaches the rooms you use. We seal accessible duct joints and insulate ductwork where recommended, helping the system deliver air more effectively. The assessment shows whether either service belongs in your home's improvement plan.

No Cost Mass Save Home Energy Assessment in Holliston

A Home Energy Assessment is the first step. A specialist checks insulation, air leaks and heating equipment, then provides a written report with recommended upgrades, estimated costs and applicable Mass Save incentives. Souzet helps with the program steps and rebate paperwork if you choose to move forward. To get started, request an assessment through Souzet or call (833) 717-5001.

Frequently Asked Questions

Can Eversource and National Grid customers use Mass Save in Holliston?
Eversource and National Grid are both Mass Save Sponsors. If either serves your home, a no-cost assessment can establish which services and incentives you qualify for. Souzet will review your account and home before recommending work.
Does Mass Save cover the full cost of insulation?
Some eligible homes qualify for 100% coverage of approved insulation, while others receive a partial incentive. Souzet shows the estimated incentive and your cost in the assessment report before you commit to the project.
How long does a Home Energy Assessment take?
Souzet says a typical assessment takes about 60 to 90 minutes. The specialist reviews the home from attic to basement and explains the findings and next steps.
Is an older Holliston home suitable for insulation and air sealing?
Often, yes. Older homes may have insulation gaps and air leaks, but the right work depends on the home's condition. The assessment identifies useful improvements and any issues that need attention first.
Will duct sealing help if my ducts run through a heated space?
It may still help if the ducts leak, but the benefit depends on their location and condition. Ductwork in unconditioned attics, basements or crawlspaces often has greater exposure to heat loss or gain. The assessment will show whether sealing or insulation is recommended.