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Oh interesting. What bit of the industry do you work in? Have you heard of Homely? Looks great for ASHP with bad built in controllers.
dbr-
Oh I haven't actually, I'll take a look into them though!
We've got a family business that's been in heat pumps for the last twenty-five years almost, we started off doing domestic installations and gradually moved into bigger commercial projects and then when Covid happened we did a complete about turn and switched to building modular heat pump plant rooms so they're basically fully turnkey plant rooms for commercial and industrial applications.
We don't really have an upper limit on size but our minimum would be around 100kW (we have done an odd one for "special" domestic clients but they're not exactly affordable...) and we can also do up to 140°c steam with heat pumps now so some pretty interesting stuff!
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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!