Courtesy New York State Energy Research and Development Authorityand Learning Solutions Winstanley

This article assumes that readers know their way around an infrared camera for doing thermal imaging. If you're unfamiliar with these tools, please review " Getting Started in Infrared," Nov/11.

Finding air leaks in existing homes can be a trying task. Driven by air pressure from inside and outside the building, air can sneak in through any crack or crevice in a building's envelope and move through any number of convoluted pathways within framing cavities. It's impossible to seal every hole in an existing building, so the real task is...

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