I have been looking for such a device and had me read through many recessions, just for the reason because energy is expensive enough and, therefore, the device should work well. The device is installed quickly and without coupling fits on heimeyer valves. The working volume of the engine is very quiet and disrupts almost not.
The device brings the room as shown in the display on the temperature. These things I have checked with a thermometer. Window open function also works reliably.
