Building professionals have a few tools to determine how energy efficient a building is, including infrared cameras that pick up heat. They can take a photo of a door or drop-down attic staircase, for example, to see how much heat is being lost to air leakage or lack of insulation. Another important tool to determine air leakage is a blower door.
March 21, 2011 1:50 PM PDT
Photo by: Martin LaMonica/CNET
| Caption by: Martin LaMonica
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