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Old 01-27-2010, 10:50 AM   #1
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Setback thermostats & energy savings??


I have a new heat pump that was installed just before Christmas (Am Std Heritage 16). I have always used a programmable stat to set back temps during the the day and while we're sleeping. My question is: Is there a limit to energy savings based on how far you drop the temp back? We like it very cool at night and I normally set it back to 62 degrees then it goes to 69 before we wake up. Am I using more energy to heat back from that low a temp than I'm saving by keeping it low at night? Just curious if there's a threshold of energy savings vs. comfort. Thanks

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Old 01-27-2010, 10:55 AM   #2
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Setback thermostats & energy savings??


I guess the question would be, how much energy are you using to crank the house back up to 69 f/62, vs. leaving the house at 68 or so.

Seems to me, that if your place is 62, the heat required to bring it back up would be much more, negating any savings.

I've not tried this in my place - just playing devil's advocate here.

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Old 01-27-2010, 11:47 AM   #3
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Setback thermostats & energy savings??


DOes your heat pump have electric backup heat?

If so, you need to see if it is energizing to get the house temp up to the set point of the tstat.

Electric heat is $$$$ compared to HP heat.
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Old 01-27-2010, 01:33 PM   #4
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Setback thermostats & energy savings??


A setback will ALWAYS save money with a gas furnace. How much depends on your location, setback temps, how many setback and how long the setbacks. A heatpump is a bit of a crapshoot. As soon as those electric strip backups come on, it's costing you 3 times what a gas furnace or heatpump would cost. Many people recommend a constant temperature (no setback) with heatpumps, but if you can find a thermostat with TRUE Intelligent Recovery (an algorithm that delays the auxilliary heat from kicking for much longer) then you might save money. The only one I know of that does this is the Honeywell IAQ and some of the more expensive Honeywell VisionPro 8000 series.

Good luck!
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Old 01-27-2010, 03:00 PM   #5
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Setback thermostats & energy savings??


If you have electric aux heat. And its used to recover the temp. Then you Are using more electric to recover. And costing yourself money.
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Old 01-27-2010, 08:44 PM   #6
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Setback thermostats & energy savings??


Thanks. I have the Honeywell with Intelligent Recovery and no, the aux heat is not coming on to get back up to temp so I will assume that I'm better off with the setbacks the way they are.
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Old 01-28-2010, 09:22 PM   #7
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If your aux strips aren't coming on during recovery, I think you're saving money with the setbacks.
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Old 01-29-2010, 06:13 AM   #8
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Setback thermostats & energy savings??


Quote:
Originally Posted by sktn77a View Post
If your aux strips aren't coming on during recovery, I think you're saving money with the setbacks.
Key phrase.

As long as they are NOT coming on. Yes, he is saving money.

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