Since the walls of our buildings are exceptionally warm, we focus on heating the air inside, not the walls, which is why the most common solution is wall electric heaters, air conditioning with a heating function, and as an additional option we can perform an installation for the installation of underfloor heating mats. It is also possible to install a fireplace type stove. It is worth calculating the costs of additional installations, the costs of their installation and subsequent operation. In general, a supporting electrical installation is the best solution, because the cost of its installation is relatively small. For example, we are able to heat a 35 m2 house to a temperature of 20 degrees with a 1000 W stove in 60 minutes.