Infiltration measurement and control in the context of an energy audit.

Describes an energy audit being developed at LBL to determine economically optimal retrofits for residential buildings, based on actual, on-site measurements of key indices of the house. Measurements are analyzed on a microprocessor and retrofit combinations compatible with minimum life-cycle cost and occupant preferences are then determined. An important element of this audit is its treatment of infiltration. A measurement of the effective leakage area of the house using fan pressurisation is combined with weather data and local terrain information to predict average infiltration using amodel developed at LBL. `House-doctoring' of the largest leakage sites during the audit reduces the leakage area by approximately 25%.