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| Sometimes there's rooms that don't count because the ceiling is too low or the heating doesn't work on the top floor (would need a space heater, etc...) | |
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I don't think heating has any part to play in calculating dimensions. Ceiling height, certainly, with, IIRC, anything lower than 1.5m being excluded from the calculated surface area.
And windows too, I believe, so an attic room with only a small Velux window, for example, may 'lose' even more of its floor area, based on a specified minimum window size per countable square metre of floor space in any given room.