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Our Experience installing a heat pump into a Grade 2 Listed stone house

 
Air Source Heat Pumps (ASHPs)
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 Travellingwave
(@travellingwave)
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Joined: 3 years ago
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Topic starter 20/02/2026 4:03 pm  

First want to thank everybody who has contributed to this forum (and the Open Energy Monitor Forum). I have pretty much learnt everything I need to know about heatpumps from reading the various topics on these forums.

At the risk of repeating much of what has already been said - I thought I would add about our experiences with a heatpump in a property that theoretically is totally not suitable for one. 

We live in a stone house/cottage in North Yorkshire which has a total floor area of c 220 M2 with a recent garden room extension bringing it up to 240 M2

Being G2 Listed there are limits to what can be done in terms of insulation upgrades - the walls are solid stone approx 450mm thick with no cavity or insulation - Ground floors are solid and uninsulated, roof has an attic room with some fiberglass insulation between the rafters. 

Existing heating was oil fired - plus an oil fired AGA in the kitchen and a wood burner in the living room

The EPC for the property is F and estimates an annual heat demand of 272 KWHr/M2 so c 60000 KWhr per annum

Despite all of this we have found it to be comfortable to live in with the combined heating from the oil burner, AGA and wood burner.

I would add that it was always clear that the EPC is a complete work of fiction since we never burned more than maybe 2500 litres of oil per year. Even with an old and inefficient oil boiler. We were both working so only heating part time.

Around 2021 it became clear that the oil boiler was reaching the end of its life - baffles were burnt out etc so time to think about replacing it.

I contacted some local companies about replacing the oil boiler and also about the possibility of a heatpump - from memory one company took one look at our EPC and told us no way would a heat pump ever work in this house , another company wanted to install 2 x 14 kw heatpumps which would require 3 phase supply to be installed , also had a quote to replace oil boiler for only a few thousand.

Being an engineer by background I decided to do some experiments with the existing oil heating system to try to understand how much heat it was actually delivering and also to see how our existing system would cope with lower flow temps.

I also took a lot of inspiration from the video on Youtube by Trystan Lee about his experience with installing a heatpump into an old stone cottage in Wales.

I will continue story in next post.



   
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