Each home had a unique combination of wall assembly, foundation, and heating system. We monitored the energy usage, indoor air quality, and ground temperature of the four homes to compare the performance of different building and mechanical systems. NW HOUSE RAFT FOUNDATION BRHEATHE SYSTEM REMOTE WALL NE HOUSE PILE FOUNDATION SOLAR HOT WATER + OIL BOILER REMOTE WALL SE HOUSE PILE FOUNDATION SOLAR HOT WATER + PROPANE BOILER REMOTE WALL SW HOUSE RAFT FOUNDATION BRHEATHE SYSTEM ARCTIC WALL Annual Usage ENERGY* ELECTRICITY WATER GROUND TEMP SOLAR OUTPUT *displayed in fuel oil equiv. for comparison between homes click for results > view report here