Before you replace windows and doors, insulate the attic or install new siding, find out exactly where the home is leaking energy and dollars. The best way to do this is to get a home energy audit-- an evaluation of your home's energy performance. Energy audits generally cost between $250 and $350, depending on how long it takes for the energy auditor, or rater, to get to your home.
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Do the homework when it comes to all those codes and numbers on window energy-efficiency labels.