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Setback savings - fact or fiction?

 
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Air Source Heat Pumps (ASHPs)
Last Post by cathodeRay 8 hours ago
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cathodeRay
 cathodeRay
(@cathoderay)
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Topic starter 19/02/2026 7:22 pm  

I also need to correct something I said by mistake earlier:

"Given the relationship between OAT and (power and) energy in is tolerably linear (energy out isn't because it is affected by changing efficiency)"

It is of course the other way round. The energy out (which is the heat loss) is tolerably linear, it is the energy in that is not linear, because as the OAT goes down efficiency goes down, and so disproportionately more energy is needed at lower OATs. The OAT vs energy in chart, to which I have now added autumn and winter 2025, should look like this:

 

image

 


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


   
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