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Yes, I have to say that that is a worry, though presumably the compressor is on the (fugly - another worry) outside unit.
I also slightly doubt that it will be needed very often. The conversion is so well insultated now, and is obviously at the top of the house that I suspect that it will generally be warm. But I might think that because it is currently summer.
Is this loft-converted room going to be a bedroom?
Heat pumps use compressors,
and,
depending upon the output, produce more noise than a domestic fridge.
You need to check the COP,
especially at low temperatures, to see if it could efficiently supply all the heat the room will need.