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Air leakage control

Reducing the leakage of cold outside air into the house in winter is the most common type of weatherization measure in Pennsylvania. Typically, work crews add caulking and weather stripping around windows and doors to reduce drafts. Old, drafty homes are not only uncomfortable, but they are also very costly to heat and cool.

Researchers have discovered, however, that tests using blower doors reveal more precisely the holes in the building envelope where outside air infiltrates into the house. Such holes often occur near the base of the building and near the roof and are unobservable to the naked eye. Hence, the widespread adoption of blower doors as a key diagnostic tool in home energy building science.

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Commission on Economic Opportunity Weatherization