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@Nahguavkire
My DIY (spoiler: I work in the trade so not really DIY) heatpump installation went off without a hitch over the Christmas break and I've just gotten my BER assessor back around to redo the certificate for the place...
We've gone from a C3 rating to an A3 and he noted that upgrading the windows would most likely get us to an A1 rating which is a bit mad for an apartment built in 2004.
I'll take some pictures when I get home later on and a bit of info on the process but I wouldn't say it's outside the realms of DIY for a competent doer!