These units are installed through the wall of your cellar (window style) and are suitable for insulated and air-tight cellars up to 25 m³.

The C25 and C25S should be installed internally, into an adjoining room, hallway, garage etc but not externally as they do not have a heating belt on the compressor.  The room/area into which these units vent must be well ventilated (see installation guide, paragraph 1.1)

The C25SR does have a heating belt and can therefore be mounted on an external wall.

Both the C25S and C25SR models provide cellar heating and cooling and the C25 provides cooling only.