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@Howard
Trigger warning: air con / room cooling chat.
This is a good description of the key differences between split / window / mono block units.
tl;dw - only buy a mono block if you have to - they do the job but the are less efficient than both window and split units - because they use some of the cool air they've just created to move captured heat to the outside of the building.
https://www.youtube.com/watch?v=_-mBeYC2KGc