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One room is colder than the rest of the house

 
Air Source Heat Pumps (ASHPs)
Last Post by JamesPa 3 hours ago
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 Pie_Eater
(@pie_eater)
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Joined: 1 year ago
Posts: 37
Topic starter 27/10/2025 9:51 am  

Hi all

heating season starting- exciting times!

my AsHp daikin 8kw installed by octopus has performed excellently over the last year . It’s used around 400 kw more power than the quote but we have our house at 21 not 20. So all good really only positive things to say.

one minor issue is that our loft /spare bedroom is around 0.5-1 degree cooler than the rest of the house (1 loop all on same temp). It was sort of expected, initially radiators we recommended to be replaced but we pushed back (all the other rooms are fine as expected).however the room is only used as a study 2 or 3 days a week and rest of the time empty. And as a bedroom the temp at 19.5 ish is totally fine. So to heat it to 21 the whole week feel totally wasteful.My wife uses it and feels the cold more than I do so would want to improve it.  

In this case , better to use a portable small heater to provide heat on days she works there? Or still better to upgrade radiators?


This topic was modified 3 hours ago by Mars

   
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 JamesPa
(@jamespa)
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Joined: 3 years ago
Posts: 3184
27/10/2025 9:56 am  

Posted by: @pie_eater
↑

In this case , better to use a portable small heater to provide heat on days she works there? Or still better to upgrade radiators?

Upgrading radiators is almost never a bad thing to do, what's the payback time and is there a requirement for it to be cooler at night (if so how do you plan to achieve that?)

Personally I would upgrade the radiator, you are talking about the loft so heating it will reduce the heat loss from the rooms immediately below.  You may even find you can knock back your WC a degree or two increasing overall efficiency. 


4kW peak of solar PV since 2011; EV and a 1930s house which has been partially renovated to improve its efficiency. 7kW Vaillant heat pump.


   
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