Locating and eliminating obscure but major energy losses in residential housing.

Outlines a number of experimental approaches for determining the energy consumption of a building, with emphasis on air infiltration. The combined use of depressurization of the house and infrared scan permits the location of "bypass" vents through which warm air is leaving the structure. Describes several types of bypasses and evidence for their widespread existance is documented. Discusses the side effects of retrofitting these and other energy loss sites with regard to fire safety, air quality and moisture.