How To Seal Air Leaks In Your Home And Save Energy

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Air leaks in your home can drastically increase energy consumption. Sealing air leaks is therefore one of the first things you should think of if you want to lower the carbon footprint of your home. A professional energy audit is the gold standard when it comes to dealing with air leaks, but by following this article you can detect and seal the most obvious leaks – the same air leaks that leaves the largest footprints in your energy bills.


To be able to detect and seal air leaks in your home, you house needs to be depressurized. This is best done on a windy and cold day, but don’t necessarily need those weather conditions to work. Follow the following simple procedure to do this:

  1. Switch off furnaces, ovens, air-conditioners, or similar devices.
  2. Make sure that every window and door in your house is completely closed.
  3. The last step is to provide some airflow outwards from the home by using either an exhaust fan or a dryer. If this is not possible, use a large fan in an open window to push air from the house and out this window that will create suction.

The point of these steps is to either generate an airflow out or in from the house. Since the windows and doors are closed the air has go to through leaks, which we can detect using one of the methods below:

Detecting Air Leaks

There are several ways that can be used to find air leaks, but I would recommend using the incense stick method. This is the most reliable way and this is usually how professional energy auditors assess air leakage also.

When you hold the incense stick close to a place where you suspect an air leak, the smoking coming of the top of the incense stick will either be sucked into the leak or pushed away from it (depending on if you push air into or outwards from the house).

These are some of the most typical places you should check for air leaks:

  • Around the moldings of windows and door
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