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how do determine alt heat setting for heat pump

zaphod
Community Member

Hi, we just had a heat pump installed with dual heat option (i.e. inside gas furnace) and I'm trying to figure out if there's a way to determine what the right programming should be for alt heat in the Nest. Reading about heat pumps online there's some indication that they become less efficient at 40degC. The documentation I was able to find on our model just says the operating range is down to -22degF, but does not have any efficiency curve. The installer programmed it to 30degF. Just wondering if anyone had anymore science behind this, thanks.

3 REPLIES 3

Jhonleanmel
Community Specialist
Community Specialist

Hi zaphod,

Thanks for reaching out. I'd love to know more about this. Could you share a photo of your current thermostat's wiring? 

Thanks,
Mel

EdwardT
Community Specialist
Community Specialist

Hi zaphod,

 

I wanted to follow up and see if you are still in need of any help. Please let me know if you are still having any trouble from here, as I would be happy to take a closer look and assist you further.

 

Thanks,

Edward

Jake
Community Specialist
Community Specialist

Hey zaphod,

 

I wanted to check in with you, and let you know that I will be locking the thread in 24 hours.

 

Best regards,

Jake