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Old 12-16-2008, 02:34 PM   #31
An old Tradesmen
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Honeywell VisionPro Thermostat

I have never left an electric aux heat set to 9.

It can actually cause you to have a higher heating bill.

If you use 9 for your aux CPH. You end up having the HP go into continuous run when its only 2 or 3 degrees below the HPs thermal balance point.

You end up using more electric that way at mild outdoor temps.

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Old 12-16-2008, 06:24 PM   #32
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Honeywell VisionPro Thermostat

But I thought that nine would bring the aux. on more often, and 3 would bring it on less often.

Wouldn't it coming on more often bring the desired temp up faster than less often?

One of my main complaints is that my unit runs almost continuously when the od temps are like 37 and below. Based on what you're saying, my run time would be reduced if I change it to 3, right?

Last edited by jeepgrady; 12-16-2008 at 06:45 PM.
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Old 12-17-2008, 03:44 AM   #33
An old Tradesmen
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Honeywell VisionPro Thermostat

Yes, setting it to 3 will reduce your run times.
Set it to 2, and it will reduce it a bit more.

Setting it to 9, means your heat pump will run 24/7 as long as the outdoor temps are below thermal balance point. Since the aux can't cycle 9 times if it satisfies the heat call, and the HP is set to 3 CPH.

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