Most simple split domestic aircon setups seem to have a wall mounted unit which is more or less opposite the external chiller.
The most logical setup for me would be the fan unit on the upstairs landing on the ceiling, so it could (attempt to) cool the whole house.
Presumably no more complex that installing a loft hatch, possibly easier.
Has anyone on here done this kind of installation?
More Googling this evening but the sun is shining...
Cheers
Dave R