Gorenje air conditioners are intended for cooling of rooms as well as additional heating in low heating seasons (spring and autumn).
All air conditioners are made on the principle of a heat pump. They do not generate energy as electric heaters, they transfer it from the surrounding air into the room where it is released at a higher energy level. This requires only a third of electrical energy. The other two thirds are from the environment, at no cost. As long as surrounding temperature is above 0°C, this is certainly the most economical heating system.
Highly efficient inverter air conditioners can also be used for additional heating during the winter, depending on outside conditions (temperature, humidity, wind etc.).