When the Canadian winter sets in and heating bills start to climb, much of the warmth escaping from your home may be slipping out through small gaps around doors and windows. Sealing these leaks is one of the simplest and most affordable ways to reduce heat loss and improve comfort. With a few materials and a bit of time, you can make a noticeable difference in both your energy use and your indoor comfort.

Why Sealing Makes a Difference

Even tiny drafts can have a big impact. When warm air leaks out and cold air seeps in, your heating system has to work harder to maintain a comfortable temperature. That means higher energy consumption and increased greenhouse gas emissions.

A well-sealed home can:

• Reduce heat loss by up to 10–15% in older houses.
• Improve comfort by eliminating drafts and cold spots.
• Lower outside noise, especially in urban areas.
• Extend the life of doors and windows by protecting them from moisture and wear.

How to Check for Drafts

You don’t need special tools to find air leaks. Try these simple methods:

• Candle test: Hold a lit candle or incense stick near the edges of a window or door. If the flame flickers or the smoke wavers, there’s likely a draft.
• Hand test: On a cold day, run your hand along the frame. If you feel a chill, air is getting through.
• Paper test: Close a piece of paper in the door or window. If you can pull it out easily, the seal isn’t tight enough.

Choosing the Right Weatherstripping

There are several types of weatherstripping, and the best choice depends on the size of the gap and the material of your door or window.

• Rubber (EPDM) strips – flexible, durable, and suitable for most doors and windows.
• Foam strips – inexpensive and easy to install, but they wear out faster.
• Silicone seals – very elastic and ideal for uneven surfaces.
• Brush strips – great for exterior or sliding doors where there’s more movement.

Measure the gap before buying. A strip that’s too thick can prevent proper closing, while one that’s too thin won’t seal effectively.

Step-by-Step Installation

1. Clean the surface. Remove old seals, paint residue, and dirt. Use a scraper and a bit of rubbing alcohol if needed.
2. Measure and cut. Measure the sides to be sealed and cut the strip to length.
3. Apply the strip. Most weatherstripping has an adhesive backing. Press it firmly along the edge, starting from the top and working downward.
4. Check the fit. Close the door or window to ensure it still shuts smoothly.
5. Inspect regularly. Weatherstripping wears over time and should be checked every year or two.

Extra Tips for Saving Energy

• Seal mail slots with a brush or interior flap to prevent drafts.
• Insulate attic hatches – warm air often escapes through the ceiling.
• Close curtains or thermal blinds at night to keep heat in.
• Consider upgrading to energy-efficient windows if yours are very old – it’s a bigger investment but can significantly reduce heat loss.

A Small Effort with Big Results

Sealing doors and windows is a classic do-it-yourself project that pays off quickly. It doesn’t require professional skills or expensive tools, yet it can make a real difference in comfort and heating costs. It’s also a simple step toward a more energy-efficient and sustainable home – good for your wallet, your comfort, and the environment.