Since the first passive house was built in 1991 in Germany the idea of low energy buildings goes around the world. The standard of passive houses was developed in middle Europe but also in countries with latitudes over 60° people was trying to realize building which “heat themself”. The standard was adjusted for colder climate and different techniques were getting invented to keep the houses in artic conditions warm. Among others in Finland passive houses arebuilt nowadays and getting more and more popular. A good insulation, an efficient ventilation system with heat recovery and clever devised heating systems make a passive house efficient and rentable. The invest is mostly not more than 10% higher as a usual building and the payback is often after 6 years already achieved.