Cavity Wall Insulation and BER rating

P

Poida

Guest
My house is B3 certified according the BER rating. It's a new built semi-detached estate house fitted with a Air-to-Water heat pump with UFH on both floors.
With a flow temperature of 30C and heating unit running about 7 hours a day the average temperature inside the house would be around 20C
I wonder how the performance is gonna improve if I get the wall cavity pumped with bead. How noticeable is the change regarding the general comfort of living and the electricity bill?
 
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