Measured space heating and total energy-consumption values are presented for a one-year monitoring period for a group of 27 low-energy houses in Saskatoon, Saskatchewan, Canada. The average space heating energy consumption for the 27 houses was 43.7 kJ/m x°C-d (2.1 Btu/ft² x °F-d) for the period from May 1980 to May 1981. The total energy consumption averaged 365 MJ/m² (32,200 Btu/ft²); and space heating energy consumption averaged 228 MJ/m² (20,100 Btu/ft²). These low-energy houses have a number of energy-conserving features--air tightness, controlled ventilation, air-to-air heat exchangers, use of south windows for passive solar gain, and high insulation levels--that distinguish them from conventional housing stock.