We offer projects of energy renovation of houses. Family houses make 65% of housing stock in Croatia. These buildings are responsible for 40% of total energy consumption at national level. Most family houses in Croatia were built before 1987 and have almost no or only minimum thermal isolation (energy class E and lower). Such houses consume 70% of energy for heating, air-conditioning and prepartion of hot water. In terms of energy consumption, energy efficiency measures reduce considerably the consumption of energy in a building, in some cases even up to 60% as compared to current energy demands.