savings energy 236 low energy buildings 85 heating 69 unconventional energy sources 45 thermal insulation 44 buildings (architecture) 41 more ... dwelling houses 31 power engineering 28 consumption 24 sustainable architecture 23 permanently sustainable development 21 family houses 19 simulation and modelling 19 data warehouses 17 firm 16 air-conditioning 16 ventilation and air-conditioning 16 evaluation of energy performance of buildings 15 costs 15 development 15 solar energy sources 13 working 12 ecology 11 thermal pumps 11 production 11 software 10 printing of documents 10 office buildings 9 computer technology 9 less ...