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Its a thing.
Means you can get a very nice soundproof ceiling at the same time, and less work than ripping out floorboards and installing underfloor. Fitting the size radiators needed for low temp here would be annoying, and heated walls are a bit scary because walls are for hanging things.
But then I would also need new windows, one room with loads of external walls insulated and so on.
All very unlikely as I don't think I will ever get a chance to buy this place, more an exercise in what if/is there a chance to heat all the old buildings in a climate neutral way.
Heated ceilings? Surely heat rising etc would make that inefficient.