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Grumpy_Git
@dbr
Ours is a 1949 mid terrace. 80mm cavity that we've filled with polystyrene balls out of a space-age beanbag, 300mm+ loft insulation (including 50% area covered by scavenged 150mm PIR boards), new triple glazing, ASHP, underfloor in the extension and rads in existing house.
£6/day during the last couple of coldest days, but that's all electricity usage not just heating. Around 19ºc