We are building a new home for ourselves with the aim of being energy efficient. As a result we are going to build to the Passivhaus standards which require our house to meet some very low energy consumption targets.
Principally the house cannot use any more than 15 kWh/m2 per annum for all the heating, and it must have a maximum heating load of 10w/m2.
Compared to normal low energy housing this represents a big improvement in terms of energy used for heating:
Despite the reduction in energy required to heat the house, it should still be warm (20C) and comfortable.