Heat Pump Heats the House… But It’s Not Cosy. Emitter Changes or System Tweak?

alastair · 2025-11-25T17:21:39Z

Hello all We've lived with our Daikin 14kW Altherma monoblock since Feb 2022 and it heats the house pretty reasonably. I'd never say that the house is cosy though - the main bedroom and living room can be, but the rest of the house isn't. When we had the heat loss survey done and the system installed we were told to upsize all our radiators apart from two, which we did. We are now thinking of upgrading one of the radiators and adding a second bigger radiator two one of the rooms (we can't do a replacement for the rad in that room for various reasons). I don't think changing the heat emitters on the system should affect the efficacy of the heat pump but I wanted to post here to make sure that we're not about to make some horrendous error. Let me know if this is a bad idea :-) We've also done all the draught proofing and insulation that we can and we still see a drop of temperature in most rooms of about 0.4C per hour. before it stabilises at about 13-14 C. Having never been interested in measuring internal temperatures or losses whilst we had a gas boiler I now find myself wondering whether this is a good, bad or indifferent rate of temperature decrease for a year 2000 build 4-bed house? Any views on this? All opinions and pointers welcome as I don't want to spend if I don't need to, and all it might need is a system tweak somewhere that I am unaware of. Cheers Al

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Air Source Heat Pumps (ASHPs)

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alastair

(@alastair)

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Topic starter 23/12/2025 4:31 pm

Thanks everyone for your responses and apologies for the slow reply.

Mars, you hit the nail on the head - what we are after is a better distribution of heat. I've been around the radiators and tweaked things here and there and it's made some difference in previously cool areas like the hall. The kitchen does seem to require more effort - the radiator is defo undersized and the kitchen roofspace (despite us being told otherwise when we bought the house) has next to no insulation so we'll be getting that fixed.

I'll also make a new year's resolution to stop being so grumbly!

👍

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