Compressor Minimum Outdoor Temperature

Hey all, I’m a first time homeowner and also first time ecobee user and as it’s gotten colder at night, I noticed that my aux heat has been running for a significant amount of time through the ecobee alerts.

After googling a bit and looking on here, I was able to see that the default of 35° for the compressor minimum outdoor temperature was too high so I set that value down to 25°. I live in South Carolina so it only gets below that on the coldest nights.

My question though, am I able to set this below 25° so that, in practice, aux heat is ONLY used when my heat pump just can’t keep up? I’m worried with ecobee saying running the compressor at too low a temperature could damage my unit and the manufacturer has not been too helpful in advising a minimum outdoor temperature when I have reached out to them.

My compressor is a Goodman/Daikin Comfort GSZB402410A

My air handler is a Goodman/Daikin Comfort AMST24BU1400

None of the documents I have nor anything I found online gave me an answer of “do not run the compressor when the temperature is lower than x°”, but I did find this manual: https://www.goodmanmfg.com/docs/librariesprovider6/default-document-library/ss-gszb4.pdf?view=true&mobiledevice=true that gives the information in the image I included with my post. Since this has a COP above 1 at -5°, can I/should I set the minimum outdoor temperature for my compressor even lower?

Thanks for any guidance anyone can give me on this!

Hey all, I’m a first time homeowner and also first time ecobee user and as it’s gotten colder at night, I noticed that my aux heat has been running for a significant amount of time through the ecobee alerts.

After googling a bit and looking on here, I was able to see that the default of 35° for the compressor minimum outdoor temperature was too high so I set that value down to 25°. I live in South Carolina so it only gets below that on the coldest nights.

My question though, am I able to set this below 25° so that, in practice, aux heat is ONLY used when my heat pump just can’t keep up? I’m worried with ecobee saying running the compressor at too low a temperature could damage my unit and the manufacturer has not been too helpful in advising a minimum outdoor temperature when I have reached out to them.

My compressor is a Goodman/Daikin Comfort GSZB402410A

My air handler is a Goodman/Daikin Comfort AMST24BU1400

None of the documents I have nor anything I found online gave me an answer of “do not run the compressor when the temperature is lower than x°”, but I did find this manual: https://www.goodmanmfg.com/docs/librariesprovider6/default-document-library/ss-gszb4.pdf?view=true&mobiledevice=true that gives the information in the image I included with my post. Since this has a COP above 1 at -5°, can I/should I set the minimum outdoor temperature for my compressor even lower?

Thanks for any guidance anyone can give me on this!