Why not start off with building codes for new construction. Why not require appropriate passive heating and cooling systems as part of building permits. We already set certain standards like ceiling height, foundation standards, size and accessibility of bedroom windows and plumbing and electrical standards. Why not require solar panels, solar efficiency in placement of windows, floors/patio slabs that maintain even temperature. When incorporated in new construction the cost is much less than when added to existing buildings and will lower energy usage over the entire life of the house.