Low-energy buildings up to the passive house level slowly become generallyaccepted also in Tschechien, which is naturally connected with suitable ventilationstrategies. The contribution presents the most frequently used technical systems anddiscusses those properties and acceptance. The number of built very low-energyhouses in Tschechien tends to rise, the absolute numbers are still very low. Stillseveral barriers are to be overcome, whereby the technical questions represent only one part.