The Aussie's are lucky, why you say? It's because they have to build with rammed earth or else the sun will cook them to death. In case you did't know rammed earth keeps you cooler in the summer and warmer in the winter because of the thick walls. These houses are from Ramco Perth in Australia
Insulation inside the walls is a good idea in Canada, this should make the house warmer than an igloo. The builders making this are Clifton Schooley and associates.