For every degree of temperature increased in home, the energy consumption is increased a 7%, but a well-insulated house is much more energy efficient, enabling an interesting economic saving. In addition, for each degree of temperature we increase in home, the energy consumption grows about 7 %, which implies a rise in the energy bill.

http://www.energynews.es/por-cada-grado-que-se-aumenta-la-temperatura-en-casa-el-consumo-de-energia-crece-un-7/