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

Depends on how it is set up. Does it have an outside thermostat? If
so the you probably can vary the point. What's your backup heat,
electric or gas? Some units never quit, they just start augmenting
with electric when they can not maintain the inside set point any
more. If your backup heat source is electric then it has to get
pretty cold before it's cheaper to use all electric.