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Old 10-24-2011, 05:41 PM   #1
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what is the best temp. to cut off a heat pump

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Old 10-24-2011, 07:03 PM   #2
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What do you mean by cut off?
Are we talking about a dual fuel system, or a thermostat setting?

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Old 10-24-2011, 07:04 PM   #3
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depends on home heat retention and area that you live in. For most of my customers I set it at 35F so they don't get hit with "cool" air in a dual fuel system.
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Old 10-24-2011, 07:59 PM   #4
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Also depends on the back up heat source. If it's electric heat you don't want the heat pump locked out above 0F since the heat pump will run with the elements and the HP is still more cost effective then just the elements. With a gas back up there's
1-comfort level as tech stated
2- the balance point where the HP can't keep up and the gas takes over 3-economic balance point where it's actually cheaper to run the gas then the HP
With the price of gas being cheap right now 1 and 3 are in the mid 30's. The house balance point(2) will be much lower. My 1000 square foot home for example has a 2 ton heat pump and it can keep up down to 9 degrees. Having 82 degree air coming out the register is neither comfortable or cost effective with currant gas prices though so ours is set on 34 degrees right now.
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Old 10-24-2011, 11:30 PM   #5
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Interesting answers. I was thinking of posting the same question. I guess it comes down to the rates the utilities charge.
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Old 10-25-2011, 08:58 AM   #6
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Can also depend on the type of heat pump you are using. I have installed some new 2 stage heat pumps which claim to be effective to -5F. Customers have been happy so far (2 yrs).

It is also dependant on the location of the coil in relation to your secondary heat source. If the Hp coil is ahead of the heat exchanger (like some fan coil units) then I would be tempted to run it to lower temps, if the coil is after the secondary heat source (like your standard furnace set up)then there is no advantage to have it running any time the secondary is needed for heating.

I typically cut out single stage units at about 32F. I have been using the Honeywell 8000 with an outdoor temp sensor for this set up and have been very happy with the adaptabliity of the control.
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Old 10-25-2011, 01:17 PM   #7
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It really depends on energy costs as well as the comfort level you want.

For gas aux: If electrical costs are low (relative to gas) and your heat pump can heat at 0F, then that might be better. If you like warmer supply air, 35F might be better. Or somewhere in between ...

For electric aux: If your heat pump can heat at 0F, then that might be better. If you like warmer supply air, 35F might be better. Or somewhere in between ...

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