Air to air heat pump : Any regrets?

barker77

https://forums.moneysavingexpert.com/discussion/comment/82000524#Comment_82000524

personally with the mini splits I have (lg) i find the heat drafty because it’s forced air vs convection but maybe that’s just me

Newbie_John

https://forums.moneysavingexpert.com/discussion/comment/82000570#Comment_82000570

Definitely depends on your liking, as it's forced air it travels so you don't end up having one hot side and one cold like with radiators.

But I guess worth keeping in mind as in winter months my one runs 24h a day, so it's like having a fan on gentle mode through the day.

silverwhistle

But I guess worth keeping in mind as in winter months my one runs 24h a day, so it's like having a fan on gentle mode through the day.

Do you modulate yours at all? I would hope to take advantage of getting heat into the fabric of the house with a TOU tariff (Agile or IOG) and even, in the shoulder months, a bit of spare PV on those clear winter days.

Newbie_John

https://forums.moneysavingexpert.com/discussion/comment/82002368#Comment_82002368

I was on Agile over winter and on 90% days price/kWh was almost the same all day outside of 7-9am and 16-19. So had it running at like 22°C all day with 18°C between 16-19. Now on cosy so much easier to set it once and forget, but i'll go with something like 18°C during 16-19, 21°C through the day and 23°C during 4-7, 13-16.

A lot of variables to take into consideration, I enjoy hot mornings at 7am, but not so much at 4pm, but then my cheap rate is 10p and the peak rate like 40p. COP drops from 4 to 3 when there is a jump in preset temperature - but with big price differences it can be ignored. 4-7am is always the coldest so again COP is lower, 13-16 the warmest so COP highest..

silverwhistle

Many thanks, useful to me, and to others I hope.

mickyduck55

https://forums.moneysavingexpert.com/discussion/comment/81995337#Comment_81995337

Sorry for the late response, A2A is very good and did cope in winter but only in the rooms that it was installed in, living room and bedroom. I did not have any other heating source from October until January (long story ) and all was fine.. it did get down to 4C in my bathroom though! I barely heat upstairs at all as I sleep with my bedroom window open whatever the weather

silverwhistle

Thanks. But 4C!? I think on posts about heating we need to know whereabouts people live and the type of house. My south coast terrace never got below 16 even when I didn't use my GCH, so I'm hoping A2A will cope fairly easily. :-) I keep my bedroom window closed during the coldest weather though, but the door open. A MVHR unit in the bathroom helps keep the air fresh.

barker77

mini splits are bad for this and I wouldn’t recommend. Perhaps a whole home ducting will be better but I wouldn’t install mini splits for heating - having done this myself it’s just cold feeling due to the forced air.

Newbie_John

https://forums.moneysavingexpert.com/discussion/comment/82004109#Comment_82004109

I wonder what's size is yours?

We have 3.5kW Daikin and 40m2 per floor, end of terrace, 90s built - getting all the sun near Dartford and is enough to heat the entire house. The downstairs open layout is enough to heat upstairs, no house extensions, square shaped floor - and even bathroom upstairs never got below 18°C (downstairs upped to 22°C during colder spells). Max usage was I think 13kWh/day with January average of 9/kWh.

mickyduck55

https://forums.moneysavingexpert.com/discussion/comment/82004976#Comment_82004976

I live in the sunny SE, I had no heating or hot water for almost 4 months over winter due to an issue with my ASHP install being delayed. I had removed my hot water tank to clear out my airing cupboard to facilitate removal of my chimney to create space for my larger new water tank..as I said its a long story. I like a cold bedroom so did not use the upstairs A2A as it is in the bedroom so no heating used upstairs for months.