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The combination of a blower door and the tools to seal leaks in your house is one of the proven ways to cut down on costly air leakage.
Using a blower door--a device that sucks the air out of your house to simulate an especially windy day--is the best way to identify where your house leaks. For many of us, a thousand little pin pricks may add up to a hole in your house the size of a window left open 24 hours a day, 365 says per year.
By using a blower door in coordination with air sealing, we can identify the biggest leaks and get them sealed.
Video of air leakage through a light switch during a blower door test.
Here's an interesting video from our friends at Energy Vanguard that shows how much air can leak through simple things like light switches.