@sapitonmix in my parents' house, build in the 60s, the living room is in the centre, you have basically no sane option to put an AC there. and you need a certain clearance from the neighbours for the outdoor unit, so that is another limiting factor.
@sapitonmix this. mounting location is problematic, and you have retarded regulations about the refrigerant usage, so you need a technician to install it, at least in Hungary. also old houses were not build with ACs in mind.