At the Tipping Point of Airtightness

September/October 2014
A version of this article appears in the September/October 2014 issue of Home Energy Magazine.
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September 03, 2014
Forty years ago, after the first oil shock, people began to look at residential energy efficiency and realized that it was terrible. People vaguely knew that houses were drafty and that they wasted energy, but they didn’t know what to do about it, or even how to measure air infiltration. Not only was there no Internet, there wasn’t even a blower door. The best technology was measuring the length of cracks with a ruler.

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