Forums

Forums
Renewable Heating
Air Source Heat Pum...
Setback savings - f...
 
Notifications
Clear all

Setback savings - fact or fiction?

 
Page 13 / 13
Air Source Heat Pumps (ASHPs)
Last Post by cathodeRay 2 days ago
147 Posts
12 Users
23 Reactions
8,321 Views
RSS
cathodeRay
 cathodeRay
(@cathoderay)
Illustrious Member Moderator
Joined: 4 years ago
Posts: 2533
Topic starter 05/01/2026 6:47 pm  

@sunandair — it is certainly interesting, because we have very different properties. Listed grade II, solid stone walls and concrete slab floor downstairs, and the only insulation I have is in the loft, and on some of the windows (secondary removable glazing, which doesn't fall foul of the Listed Building requirements, and it is also a major draft stopper). The net effect is a high fabric thermal mass. But what is exactly going on in the walls for example? The outside will in the absence of solar gain be near the OAT, and the inside close to the IAT, but what happens to the gradient during a setback and recovery? And does it matter? And as @jamespa pointed out, the immediate environment (eg local ground temp) will also change with the seasons, what influence, if any, does that have?

These and other unknown unknowns are why I prefer a matched control empirical approach, but as you know that has proved easier said than done. I am hoping that if I run without a setback this spring, having run with a setback last spring, then I may find comparable days, one with a setback and one without, and in the meantime I hope to refine my method for selecting matched controls. It seems I am in this for the long game, whether I like it or not! 

 


Midea 14kW (for now...) ASHP heating both building and DHW


   
ReplyQuote
SUNandAIR
 SUNandAIR
(@sunandair)
Noble Member Member
Joined: 3 years ago
Posts: 514
05/01/2026 7:05 pm  

@cathoderay interesting house…. Before I retired listed buildings was my thing.

i wish you every success.

 



   
ReplyQuote
cathodeRay
 cathodeRay
(@cathoderay)
Illustrious Member Moderator
Joined: 4 years ago
Posts: 2533
Topic starter 05/01/2026 7:09 pm  

Posted by: @sunandair
↑

Before I retired listed buildings was my thing

They are lovely, and I feel lucky to live in one, but they do have their downsides too! 


Midea 14kW (for now...) ASHP heating both building and DHW


   
ReplyQuote
Page 13 / 13
Forum Jump:
  Previous Topic
Next Topic  



Share:

Join Us!

Worth Watching

Latest Posts

Click to access the login or register cheese
x Powerful Protection for WordPress, from Shield Security
This Site Is Protected By
ShieldPRO →