In this category i try to explain different heating systems and types of constructions and to write about basics. If you think about the fact, that 75% of the energy requirement inside builidings are used for heating and another 12% for water preparation there is an extrem high saving potential. But also important is the choice of the right heating system and the right energy source. Die usuage of solar heat and high efficient heating systems should the base. Where ever it seems reasonable and economical realizable decentral power supply can be used and a part of the needed energy can be produced locally. So the power supply systems can be discharged and it is possible to disclaim micropollutants power stations.