CANADIAN ARCHITECT. Housing accounts for 17% of Canada’s secondary energy use and 15% of greenhouse gas emissions. Growth in the housing stock has contributed to a net 14% increase in household energy use since 1990. The energy consumption and greenhouse gas emissions from this sector will continue to grow if the industry does not move to build homes substantially more efficient. Net-zero energy housing (NZEH) provides a means to accomplish these reductions. Read More.