[AitchEmArsey]

> I do find it odd air-to-air source heat pumps are not considered more often in the UK

Could be due to housing density and the reputation for noise, though I'm not sure how well-deserved that really is.

Mostly I just think it is a mismatch between the age of housing stock (and the pre-existing heating solutions) with incentives.

If I were building a new house I wouldn't bother with a gas supply and would use a ground-source heat pump combined with underfloor heating - but retrofitting that to my 150 year old house is never going to be cost effective versus a boiler.

For residential developments, the government should just mandate no new domestic gas supplies and be done with it.

[hedora]

Underfloor heating has an 8 hour turn on/off lag time. It's nearly useless out here in the SF Bay area, since we go from short sleeve to jacket weather every day, almost year round.

Our air source heat pump is much quieter than old air conditioners. For efficiency, it has a giant, slow, variable speed fan. It's usually not running anywhere near full speed, and is still quiet when it does. Similarly, the blowers in the ducts are variable speed.

[dageshi]

I believe it has mandated that from 2025.