Energy audits of existing residential builings in-situ with a microprocessor.

Describes an energy audit procedure developed for determining economically optimal retrofits for a residential building. This audit is a microprocessor -based, interactive, site and house specific package addressing conservation, solar and wind measures. A dymnamic model of heating and cooling load is used to evaluate fuel savings. Special attention is given to the estimation of monthly average air infiltration rates, using a model correlating pressurization results with air infiltration under natural weather conditions. Retrofits optimized for maximum net life-cycle savings can be further adjusted on site in accordance with the homeowners preference.