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Posted by LouB on October 19, 2009, 11:50 am
trader4@optonline.net 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?
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> 20s. Our old heat pump would shutdown when the outside temp dropped
> below 35deg. =A0Is our new machine running correctly and, if so at what
> point should it stop based on Outside temp?
> Thank you, TW in Western NC