The (colder) air is blown back outside, so I suspect that it has no impact on the indoor temperature. I have not noticed anything so far in the affected basement room.
Hello. Thank you for the answers. We do not want an indoor unit for various reasons. First and foremost: lack of space in the technical room, which we want to use for a separate apartment. Another reason is the possible problems with condensation at the wall penetrations, etc. But above all stands the space. Therefore, definitely an outdoor unit. And no, also no split variant. It is a monoblock.