Prior to the study period, sprayfoam insulation and foam-board insulation were installed to reduce thermal losses through doors, leakage through vents and along cracks, and repair holes. The electricity consumption during the study was recorded over time from an electric meter. Propane use was recorded from the propane tank dial and converted to kWh based on the energy content at sea level. Energy costs were estimated based on local energy rates: $0.10/kWh for electricity and $0.11/kWh for propane (or $3.00 per gallon).