Poland (and the rest of EU, I believe), has an energy certificate:
It shows the building's yearly non-renewable energy usage in kWh per sq. meter of floor area. It is required for every new building, and for buildings undergoing a large renovation. It was implemented a few years ago to help buyers choose buildings with lower heating costs, which would force builders/sellers to invest in efficiency. In practice people haven't learned to pay attention to it. I guess that a pretty house is more important an efficient one
