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Extend the colder range of the weather compensation curve?

 
Air Source Heat Pumps (ASHPs)
Last Post by TheBinMan 2 hours ago
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 TheBinMan
(@thebinman)
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Joined: 2 years ago
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Topic starter 12/11/2025 2:22 pm  

In theory everyone has a heatpump designed to deliver the heat required at a certain outside design temperature for whatever part of the country you are in. Say for example a system is designed for 45DegC at ODT -4DegC.  

Now when it comes to the weather comp curve my system will allow me to input a flow temp down to an outside temp of -20DegC.   Are there any issues in extending the linear line beyond -4DegC?   

At the end of the day if it's colder than -4DegC then the heat pump input will surely need to increase flow temp to maintain internal house temp?  And for arguments sake we are going to assume my ASHP can deliver the heat required down to -20DegC.

Earlier this year I do recall some days of -8DegC and always below freezing for several days.  From memory I don't recall any complaints but just made me wonder especially if was even colder.


This topic was modified 2 hours ago 4 times by TheBinMan

   
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