Rather than argue with the naysayers all over the internet who’ll claim that heat pumps don’t work, the boffins at Octopus have produced a live dashboard to chart the online data they get from all the thousands of systems they’ve installed. This is a fantastic resource. Looking at the numbers for the fleet as a whole I’m pleased to say that ‘Rosy’ (my Cosy) is bang on the norm as far as performance goes. https://octopus.energy/cosy-heat-pump-performance/?utm_medium=email&_hsenc=p2ANqtz-92N1fVWdFAehre8wYictiCqGgrnpGeD9V5_EB3att0qPTctKB8kOeNTffe3KS1P7Gv41P9c_5XE4noQ-RqhVWDvpjwnA&_hsmi=131414226&utm_content=131414226&utm_source=hs_email
@christineburns Would love to see how they propose to install them for a top floor Glasgow tenement flat.
@scotdowser There are other options. Communal housing suggests a communal solution but the experts would be able to tell you what’s best. I wouldn’t use an air source heat pump to bake a cake but the unsuitability doesn’t prove anything.

@christineburns @scotdowser Newer refrigerants (or sometimes just a better design with the same refrigerant) can actually do pretty well even for air-sourced heating.

Personally I would hope for a zoned setup for anything communal, rather than cheaper hacks that should never be used (one also sees similar hacks on water radiator heating in crappy buildings).

Some dual-conduit portable ACs can also do heating, among other options (those are the ones that don't create a negative pressure, anything that creates a negative pressure is a bad idea).