At the Tipping Point of Airtightness
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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