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LouB[_2_]

wrote:
On Oct 19, 9:11 am, " wrote:
Our new SEER 14 heat pump runs when outside temp drops into the low
20s. Our old heat pump would shutdown when the outside temp dropped
below 35deg. Is our new machine running correctly and, if so at what
point should it stop based on Outside temp?

Thank you, TW in Western NC

I sure hope it hasn't been in the low 20s in NC this season yet.

You new heat pump is likely working fine. New ones are more
efficient and can function efficiently at lower temps. As long as
it's heating the house sufficiently, you are likely OK.

The exact point where it makes sense to switch to aux heat depends on
factors that we don't know:

the efficiency curve of the heat pump vs outside temp
the cost of electricity
the cost of whatever fuel the aux heat uses

Has the OP asked the heat pump's maker?