Oh, well done. You now can count with ~11W/m²K instead of 7W/m²K and may be the difference on the ceiling is also 1-2K higher than at the ground which makes it easier for your heat pump to permanently get rid of the cooling energy. And I assume your cooling is reacting much quicker compared to a floor heating - I usually need to start cooling hours ahead of the heat period. The bad part is what you mentioned: it provides little capacity for storing the cooling energy, so it makes it also more likely that the heat pump needs to switch on and off when the cooling requirement is reduced. I assume your are not using the floor heating to increase the cooling capacity and store some of the cooling energy? - I was also considering ceiling circuits when planning my house. Today I think, that putting the cooling circuits deep into the concrete of the ceiling may have been the most effective solution with respect to keeping a building cool during a long heat period. One would need to start cooling down the ceiling two or more days ahead to store the around ~0,6kWh/m², but this is quite possible to do. Today I understand, why smart people combine a concrete core activated heating with a floor heating - at least for the top most ceiling this is a really great addition with really little costs. Unfortunately, I forgot to request the 6 additional circuits it would have taken in my house to implement this in my top most concrete ceiling. I assume this would have made it easy to keep the upper floor 2K colder than now. Best regards Gwyn
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