Abstract
The work deals with the reconstruction of a family house on the part of energy for heating need. The attention was devoted to comparise individual alternatives, which are possible to realise in assessed house. In the first part of the work, the attention is devoted to describing object and to heat loses values before and after the measurements. Then alternatives of heating their annual costs for heat production and for amount of fuel, invested costs and the portion of invested and overall are particularly characterized. In the part: The economical evaluation of the comparised alternatives, simple return of investments outputs, discount time of return, net actual value and yield rate are. These values give information about the expedience of applications of individual alternatives by economical aspect.