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I can't see the system performance graphs for the AC units but I'll have a proper look over lunch. It would really boil down to their efficiency at heating...
My immediate gut reaction would be that if you've got UFH in already then yes it would be worthwhile to swap to a HP for that and the DHW, it'll be a more pleasant heat than using the AC all the time which would make the place quite dry.
Nahguavkire
Soul
I have a question for you.
New build (2019) which is super efficient. We've installed AC cassettes in 7 rooms (basically all except bathrooms / hallways). We have two of these powering them.
Is it worth replacing our gas boiler with a heatpump or could / should we just run individual units to heat rooms either on a schedule or on demand with the AC and turn off the rads in those rooms?
We've got wet underfloor heating on the ground floor if that makes any difference.