Heat Pump COP

[djn602]

Might one of you pros be able to post the various COPs for my American Standard 20 seer 5 ton dual stage heat pump? I had it installed last spring. I can get the exact model if needed. I found a niffty on-line cost calculator and think that a 25 degree lock out is too low for what I pay, .10 kw and .84 a therm. TIA

[beenthere]

I don't have the COP's for Trane. But, with the rates you posted. The heat pump would have to be operating at a COP above 3.48 for the heat pump to be cheaper. Doubt that its anywhere close to that at 25°F outdoor temp.

Would need full model numbers of the outdoor unit, indoor coil, and furnace for anyone to find the COP's for your unit.

[sjones]

I dont do American Stardard but Carrier show 3.7 for Low stage on the 19 seer and 3.5 on High stage

[beenthere]

I dont do American Stardard but Carrier show 3.7 for Low stage on the 19 seer and 3.5 on High stage

At what outdoor temp?

[djn602]

I will get the info tomorrow. Last week (and before our cold snap hit I set the cut off at 35. I think I am in the ball park. I also wonder if I should set the gas heat cut off at 50 or?

[djn602]

Took me awhile but I got the numbers. From scouring the Internet I think it looks like the COP is 3.3 at 47 degrees. Eeek, doesn't make much sense to use the heat pump if that is right.

Furnace: AUH2D120A9V5VAC
Coil: 4TXCD010CC3HCAA
Heat Pump: 4A6Z0060A1000BA

What do you think, should I set the cut off at 45 degrees and move on? Should the gas rate go up a bit I can revisit the issue and use the handy on-line calculator.

[beenthere]

Probably should lock it out at 50.

[motoguy128]

A COP of 1.0 is more efficient than even a 99% afue furnace. You'll have to decide which if the cheapest rate wise to create a million BTU's I'll bet money its still cheaper wit the HP

Not at his electric and gas rates. IF gas rate go up more than electric rates in the furture, he might be able to lower his balance point.

A heat pump isn't more efficient if you factor in losses at the power plant and ditribution in supplying that electricity. A 95% furnace close to the same fossil fuel as a geothermal or inverter based heat pump system. IF oyu care abotu carbon emmissions... then a furnace wins since most electricity comes from coal.

[beenthere]

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[tipsrfine]

Might one of you pros be able to post the various COPs for my American Standard 20 seer 5 ton dual stage heat pump? I had it installed last spring. I can get the exact model if needed. I found a niffty on-line cost calculator and think that a 25 degree lock out is too low for what I pay, .10 kw and .84 a therm. TIA

Post a link to that calculator please. Your conclussions back up my own calculations for the St. Louis area. I could see the sense in having a duel fuel set up, just because anything could happen in the future; but for the time being it seems like natural gas is the way to go for heat in my area.