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Home Repair - - If it ain't broken, don't fix it. Otherwise look here.
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Posted by SteveB on December 24, 2007, 7:07 pm
What is the operating temperature range for a heat pump? Mainly the low
end. I know heat pumps work by heat transfer, even from cold air, but what
is the lowest outside temperature before their efficiency starts to drop
off?
Thanks
Steve
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Posted by Roy Starrin on December 25, 2007, 9:55 am
On Mon, 24 Dec 2007 16:07:14 -0800, "SteveB"
>What is the operating temperature range for a heat pump? Mainly the low
>end. I know heat pumps work by heat transfer, even from cold air, but what
>is the lowest outside temperature before their efficiency starts to drop
>off?
There are lots of experts who will undoubtedly reply to this. I am
simply a VA homeowner with a fairly new heat 16i pump. It
depends on many things. But, theoretically, I guess it is at or near
32 degrees.
Do you have strip heaters as part of the installation? When they come
on the cost to operate the system really goes up.
I have alternative heat available. I watch current temp, as well as
the forecast temp, before turning one off and the other on. I
usually do this about 35 degrees; no science behind it - I just sort
of decided on that as close enough. I have been told that ti is
possible to compute it for a given heat pump, in a given location, but
that is beyond me.
Also, my boiler can heat the house faster than the heat pump, so I
frequently turn it on in the a.m. and let it bring the house up to
operating temperature, before turning on the heat pump. I work
online, starting about 5 a.m., and I appreciate the quick warm up,
since I turn all heat off at night. This also allows the outside temp
to warm up, meaning it operates more efficiently
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