I've tried this many times over the years but when the walls are already heated up and the temperature outside stays high during the night it makes very little difference to confort levels. The heat just radiates from the walls and heats the inside air all night. Until I got proper air conditioning installed I just suffered during the summer.

That does work (mainly at night). But it's annoying when the walls don't cool down. I've found that it's better to have very large windows because they don't retain the heat (just close the blinds during the day).

The cheap ones are noisy

That is surprising. I've had two in the last dacade, the last one bought 3 years ago and they are around 60dB which is standard from what I've seen. I checked the local midea models and they still say >60dB in their spec. No decent central or split system gets close to that kind of noise and personally I find it impossible to live with.

I also have pot smoking neighbours. But at least they are really nice!
(I get to eat all the crazy excess foodstuff they buy while getting the munchies... 😁 )