7 Simple Ways to Air Seal your Home to Save on Energy

air sealing your home

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air sealing your home

Energy loss is the main reason for high heating and cooling costs. In winter, cold air outside tries to ply inside and warm air inside tries to escape out through roof, window, holes and cracks. In summer, the flow of energy reverses, radiation and convection of heat from the roof pushing the hot air into the house while the cool air inside running away. The best strategy to reduce energy loss is to air seal your home. Here are seven simple ways to make your house airtight and save on your energy bill. 

1. Weatherstrip Doors and Windows

When a house is old, there are probably many gaps and cracks in walls and doors where cold air sneaks in. Seal those gaps will make your home warmer in winter and cooler in summer, and save up to 15% of the energy bill.

Choose a weather strip product for each specific location. The frequently used types of door seal are screw seal (1a) and adhesive seal (1b). To weather strip a door, you need to take the old seal off the door jam and apply new door seal.

1a. M-D Building Products 5090 Triple Fin Door Sweep DV-1, 36 Inches, Aluminum

1b. M-D Building Products 43304 Cinch Door Seal Tops and Sides


There are many different types of window weather strip. Window weatherstrip seal for small gaps is usually self-adhesive such as foam tape (1c) and vinyl strips (1d). The weatherstripping you use should create a tight seal when the door or window is closed but still allow it to open freely.

1c. Duck Brand 284427 Self Adhesive Foam Weatherstrip Seal for Small Gaps


1d. M-D Building Products 78196 Vinyl Gasket Weatherstrip

2. Reglaze Old Windows

After years of exposure to the sun and rain, the glazing of windows deteriorates over time, either with cracks or missing. Cold air can sneak in through the cracked glazing. The simplest way to fix this is to reglaze the window. You need to use a putty knife (2a) to remove the old putty. Heat gun (2b) can help soften the old glazing for easier removal.

2a. Marshalltown 16140 Double-Ended Window Tool

2b.Wagner 0503008 HT1000 1,200-watt Heat Gun


Then apply new putty (2c) on the glass panel. It is recommended to reglaze the window when outside temperature is between 40 and 80F degree. When it is too cold or too hot, the putty compound won’t stick well to the glass panel.

2c. C.R. LAURENCE 33HPW CRL White Dap “33” Glazing Compound

3. Caulk Cracks

You may also notice small cracks between window frames and walls. Simply caulk around window and door frames to close those gaps and cracks.

Dap Inc 18152 6 Pack 10.1 oz. Alex Plus Acrylic Latex Caulk Plus Silicone, White

4. Use Spray Foam to Seal Gaps

When the gaps or cracks are too big to use caulk to seal, you may want to use spray foam.

GREAT STUFF Big Gap Filler 12 oz Insulating Foam Sealant

5. Insulate Electrical Outlets and Light Switches

Cold air can come in through electric outlets and light switches. Go over your outlets and check whether there are any serious drafts. If so, gasket covers can be an easy solution to stop the cold air.


Gasket Covers, Electrical Outlet & Light Switch Plate Draft Stopper Foam Gaskets

6. Insulate Recessed Light

The recessed light can also create a significant draft of air. On the attic floor, you can place recessed light insulation cover to stop air draft from a recessed light fixture and keep flammable insulation at a safe distance from hot recessed lights.

Tenmat FF130-E Draft Stop Covers for Recessed Lighting

7. Home Energy Audit

Last but not least, conduct a home energy audit to find out where the issues are with your house regarding the energy loss. Usually, the utility company provides subsidies to cover most cost of the audit. In my case, the audit only cost me $100 while the power company covered $300. An audit report will be provided to you a list of insulation work needed to reduce energy costs.

To lower your energy bill requires reduction of possible energy loss. Making your house airtight is the key to conserving energy and cutting energy spending.  

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air sealing your home


  1. Thanks for these tips!

    What would you use for a sink? We have cold air coming in through the sink drain and around the edges since installing granite counter tops. Thanks!

    1. Thanks for stopping by. You may want to check whether that is a plumbing issue or an air seal issue. I suggest you call plumber for assessment and estimate. All the best.

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