stock has been slow in Denmark, which has, in turn, slowed down theimprovements in energy efficiency. Because new buildings are ingeneral much more energy efficient than older buildings, moreemphasis should be given to retrofitting older buildings. The SwedishMillion Programme offers a summary of the possible difficulties inimproving the energy efficiency of buildings. Initially, the programmewas set up by the Swedish Parliament with the goal of building 100 000dwellings per year between 1965 and 1974. These buildings need to beretrofitted due to their age and could provide an opportunity for furtherenergy savings. However, various barriers exist preventing this fromhappening. Energy efficiency improvements do not reduce the operatingcosts of these buildings and, therefore, rents must be raised. Theseapartments are in low-income areas and the residents might not be