chrisgreen

Our installation was delayed a bit but should be in this week. Will be interesting to see what happens in this upcoming cold weather... @Hanksy - how have your units been getting on?

Hi All and thanks so much Hanksy for keeping us updated with your figures. We've taken the plunge and bought 2 x 5kw Daiken ac units to heat our large kitchen diner. Having them installed this week - will let you know how things go...

Thanks Ferdinand! In this house we have no existing central heating: no rads no nothing! Just one logburner in the lounge... Good point about placement of any future rads on internal walls.

Hanksy, I meant to also ask - the cost per day you've calculated e.g. 79p/day, is that figure including a saving due to having PV? Or is that the figure before taking anything off?

Wow, thanks for all that useful info Hanksy!! A few questions if that's ok: What made you switch from pellets to Aircon? Why did you pick Aircon over A2Water heat pump? And are you in a warm part of the country? How many hours are in the day you're using? The PV is covering some of the AC cost? A 10kw PV array - fabulous! Do you get much from it in winter? Is it worth the initial outlay? Have you been able to predict at all what your cost per day might be in mid winter (would that be possible to work out based on your existing cost and COP ratio thingame, and the manufacturers' COP for a colder temp (if they provide it?). And can you recommend a good online heat load calculator!? Thanks in advance! Please do post your monthly winter data if you have time!!!

Wondering the same... Could we have two systems - an A2A in the loft, and a A2W for downstairs... Or storage heaters upstairs and A2W downstairs given a good chunk of the downstairs is new build/better insulated...

Thanks ProDave. If we have larger low heat rads in the house then does that mean we can run the ASHP at low temp (35degrees?) and would this mean higher COP and lower ASHP running cost?

Will check with our builder on his logic and get back to you! Heat load: as we only have a log burner, I don't have any energy/hr info I'm afraid... I understand from another thread that the thing to do is calculate our heat loss per room to them workout how many kWh we need to heat each room?

Thanks for all the replies!

Hi! Wish we did, but the house has no central heating at all - just a log burner in the lounge. I've kicked off a thread with more info...would be great if you all could take a look and see what you think! https://forum.buildhub.org.uk/topic/23627-will-ashp-or-air-to-air-be-better-for-a-1930s-detached-or-storage-heaters/

Hello everyone! I'm new to the forum but have been reading it and it's great. We've recently moved into a 1930s detached brick cavity house (off the gas network, no current central heating). We're in Cumbria so it gets chilly! We've been grappling with how to heat the house. It has no central heating, no ufh, no rads, just a log burner in lounge. The previous owners used an assortment of plug in and kerosene heaters. We've put in a (solar friendly) 250l unvented HW tank with immersion. We want to work out which would be best: ASHP with low heat heaters (as there's no UFH), or Air-to-Air system (seem less popular than ASHP...why? Not as good?), or storage heaters, and how best to heat HW (solar thermal seems long pay back times though might be putting in with current RHI scheme?). Energy prices are of course a big concern!! (We've discounted oil due to environmental issues). The house: has 3 beds and family bathroom upstairs, and lounge, hall, dining room, utility all on suspended wooden floors which we took up, insulated between joists, then boarded before putting down limestone tiles. Builder warned us against cavity insulation for existing brick walls due to cavity bridging issue. (But not sure we could get ASHP RHI payments without it?!). We've added on a 30m2 kitchen extension to ground floor side of house earlier this year - The new extension is a vaulted ceiling 25m2 kitchen extension off the existing dining room to the side of the house. It has insulated concrete floor plus insulated block walls. We didn't futureproof with an UFH wet system (oh dear!) as we thought ASHP + low heat wall rads were a non-starter and would not manage to heat an older leaky house even with our added insulation measures, so we thought the only option was storage heaters with potentially solar thermal for HW. We're revisiting our decision due to the crazy current cost of electricity. We discounted solar PV at present as is expensive to put in and doesn't seem to give us enough energy when we need it. Main house has double glazed windows put in 6 yrs ago, and new bifolds and double glazed windows in the extension put in earlier this year. We've added lots of loft insulation and added internal wall insulation to the rooms on the east wall of the house (lounge and 2x beds). We aren't trade or DIYers as is probably clear with how I've described things! I've tried researching myself, but hard to make sense of the jargon. Also the sellers of heat lumps seem so keen to sell that we don't know if it's actually right for us or not! We had a ground source person come and quote but it was v expensive as we'd need bore holes as not enough space for horizontal array...this expense seemed risky given we weren't sure if a low heat systems would work in our older house! Any advice would a GREATLY appreciated! Feel like we're going round and round and definitely feeling our lack of technical know how!

Hi Greenbot! I'm writing to ask how you got in with your ASHP project? We've recently bought a 1930s detached, and like you want to find a planet-friendly way of heating it. Found your thread and would be so grateful to hear your experience and learnings.