Improvement in energy efficiency and indoor climate in naturally ventilated houses.

In Sweden there are close to 500000 one-family houses heated by electric baseboard heaters. Of them 90 % were built before 1980. In this group the most common ventilation system is natural ventilation. Half of all houses 'with electric baseboard heaters were built between 1971 and 1980. The Swedish Council for Building Research has been asked by the Swedish government to carry out a program concerning the efficient use of electricity in buildings. Consequently one-family houses with electric baseboard heaters and with a high consumption of electricity are an area where research and development and demonstration projects are needed. Making the use of electricity efficient in one-family houses with electric heating includes measures to reduce the consumption and to reduce the power demand. In one project, which is carried out in four different cities (UmeA, Stockholm, Goteborg and Lund), 37 one-family houses have been investigated. The objective of the project is to show how electrically heated one-family houses can use electricity more efficiently employing existing techniques. The indoor climate is to be kept at the same level or improved. This paper deals with the investigation in Lund (Blomsterberg 1993).