Advanced Air Sealing

Reduce the amount of cold or warm air that leaks in and out of your home for

Comfort & Savings

Your home may have energy-efficient insulation to regulate the temperature throughout the year, but that is not the only way to cut down heating and cooling costs. Air sealing significantly reduces the amount of cold or warm air that leaks in and out of your home.

Sealing Penetrations in Living Spaces

We spray foam into the holes and cracks where plumbing lies between your walls and floors. We also apply caulk to your window frames, door frames, and baseboards. For further air sealing, we can weather-strip your windows and install foam sheets behind electric outlets.

Attic Floor Air Sealing and Insulation

We use urethane foam spray, caulk, and other high-quality materials to seal holes, vents, wall intersections, and recessed lighting in the attic floor. Then, we add insulation to strengthen the attic ceiling’s thermal blanket.

Our team of building scientists prioritizes corrective measures to maximize cost effectiveness, comfort and energy-efficiency. We focus on the home performance fundamentals: air sealing and insulation.

Basement Air Sealing

We use spray foam to seal the sill plate of the basement. We can also seal holes around basement plumbing, wires, and cracks to prevent the intrusion of harmful air associated with dampness, heating fuel, and furnace combustion.

As we progress from basic to advanced air sealing measures, we increasingly make the home envelope tight and fortify the thermal barrier of the home.

Exterior Wall Insulation

We blow high-density cellulose into wall cavities for both air sealing and insulation. Our strategic placement of cellulose in your exterior walls blocks any leakage that can weaken the wall’s insulation and cause indoor temperatures to become colder.

Infrared Imaging: Tools of Advanced Air Sealing

  • Cold objects as dark (black)
  • Hot objects as light (yellow)​

Infrared imaging reveals:

  • Heat passing through walls
  • Heat passing through windows
  • Heat escaping the basement
  • Heat warming the roof deck

Schedule a Home Energy Solutions energy audit

Gain access to powerful, financial incentives to invest in and to upgrade your home.

Subsidized home efficiency diagnostics and improvements

Rebates for insulation, windows, heating systems, water heating

Financing at 0% or 4.99% interest for comprehensive upgrades

Where to Insulate

1. In unfinished attic spaces, insulate between and over the floor joists to seal off living spaces below. If the air distribution is in the attic space, then consider insulating the rafters to move the distribution into the conditioned space.

(1A) Attic access door

2. In finished attic rooms with or without dormer,

(2A) between the studs of "knee" walls

(2B) between the studs and rafters of exterior walls and roof,

(2C) and ceilings with cold spaces above.

(2D) Extend insulation into joist space to reduce air flows.

5. Band joists.

6. Replacement or storm windows and caulk and seal around all windows and doors.

3. All exterior walls, including

(3A) walls between living spaces and unheated garages, shed roofs, or storage areas;

(3B) foundation walls above ground level;

(3C) foundation walls in heated basements, full wall either interior or exterior.

4. Floors above cold spaces, such as vented crawl spaces and unheated garages. Also insulate

(4A) any portion of the floor in a room that is cantilevered beyond the exterior wall below;

(4B) slab floors built directly on the ground;

(4C) as an alternative to floor insulation, foundation walls of unvented crawl spaces.

(4D) Extend insulation into joist space to reduce air flows.

Yes! For a limited time, Energize Connecticut is covering between 75% and 100% of Home Insulation Costs through Home Energy Solutions! We have the expertise to find all the rebates and low-interest payment plans for which you qualify. Get started now.

During an Home Energy Solutions (HES) visit, a utility-certified technician will evaluate your home’s energy performance and install energy-saving measures such as sealing air leaks and installing energy-efficient lighting, faucet aerators and low-flow showerheads. The technicians will also provide written recommendations for deeper energy -saving measures such as insulation, high-efficiency heating and cooling, water heating, windows and appliances. To help you in making smart energy choices, your recommendations will include information on rebates and financing along with payback and investment information specific to your home.

Before You Go...

Its Your


Every month, you’re paying a small charge on your utility bill for the purpose of helping Connecticut residents make their homes more energy efficient.

Why not benefit from it?

2,750 Recently Completed Jobs

Thousands of your neighbors recently chose HCP to perform their Home Energy Solutions (H.E.S.) Assessments.

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