Assessment and control of indoor air quality in a super-insulated, retrofit house.

A single family residence in St. Paul, Minnesota, constructed in 1957, was retrofitted in 1983. This resulted in approximately 50% reduction in annual heating consumption compared to the average consumption over the previous three years. However, the occupants complained of poor air quality. Measurements indicated that total particulates, CO, CO2, relative humidity, and temperature were at levels of some concern; NO2, radon and formaldehyde concentrations were not significant. To improve indoor air quality while maintaining energy efficiency, additional modifications to the HVAC system were made. Results indicate that acceptable environmental quality can be achieved with minimal impact on energy consumption.