Air Sealing































When a home is not properly sealed, outside air can leak in to your home causing reduced comfort. Additionally, outside air mixes with air from your heating and cooling systems, which contributes to larger amounts of energy waste. A quick and easy solution to prevent such air leaks is to add weatherstripping and air sealing to windows and doors. This is cost-effective and will reduce your utility bills. Below you can find a few methods that will help you identify and seal these leaks with appropriate materials.

The graphic above shows common air sealing troublespots within a home. There are 19 key areas of the home where air sealing can improve a home’s energy efficiency, comfort, and building durability. 

What can you do about it?

Air seal around all entrance doors and windows.

Weatherstripping and caulking limit air leaks that could account for 15% to 30% of heating and cooling energy requirements.


Common Types of Weatherstripping

Seal air leaks.

Use caulk, foam spray, and weather-stripping around electrical outlets, cable and other wiring. 

Did you know?

Air Sealing vs. Insulation


Insulation is like a fuzzy wool sweater on a winter day. It will certainly keep you warm if the air is calm. But if the wind picks up, you are going to need a windbreaker to keep the breeze from carrying away the heat. Air sealing is like adding the windbreaker. It keeps the conditioned air where it belongs.

Fix gaps around chimney and furnace flues.

Seal air leaks around fireplace chimneys, furnaces, and gas-fired water heater vents with fire-resistant materials such as sheet metal or sheetrock and furnace cement caulk. Also, keep the fireplace flue damper tightly closed when not in use.

Funded by the Local Government Strategic Plan Strategies Program

under the auspices of the California Public Utilities Commission.

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