The subject of this article is to analyze the heating performance of the heat pump driven by an internal combustion engine for natural gas in the system of the air / water. In recent years, increased attention has been paid to gas heat pumps in heating, ventilation and air conditioning due to its advantage and to reduce power consumption during heating and cooling. Gas heat pumps have significant advantages over electric heat pumps, although do not reach a significant coefficient of performance. The advantage of gas heat pumps is the ability to use the waste heat from the engine cooling and exhaust gas while saving fossil fuels in connection with the production of energy from renewable sources - air.