Professional energy auditor Karl Rosenau sets up a blower door at the start of a recent energy audit in Cloquet. The blower door blows air out of the house, which causes cold air to come in all the cracks and poorly insulated spots, making them easier to identify. Jana Peterson/jpeterson@pinejournal.com
Read the article: Energy audits take the guesswork out of making a home more energy efficient (and heating bills lower)
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