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Old 06-25-2009, 07:43 PM   #29
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heat fix with blanket

The wife complained about cold beds in the shoulder season, so I put an auto electric blanket below the sheets. That worked until I tripped over the wire... Also, we forgot to turn it off. So I bought a manual 60 min timer for 120 V, wired in another 12 V outlet by the lower head of the bed. Plugged in the blanket permanently. Now she just turns on the timer an hour before bed and is comfy toasty.
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Old 07-14-2009, 10:00 PM   #30
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I am two weeks into full-timing while working far from home. I am at an RV park that has separate electric meters for each site, and charges the monthly campers for electricity. My question is: which is cheaper to use when the nightly lows are in the 50's - the heat pump or the furnace?
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Old 07-14-2009, 10:22 PM   #31
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Propane is roughly 90,000 btu per gallon. Heat pumps produce very roughly 10,000 btu per kilowatt hour.

No telling what the efficiencies of your heat pump and furnace.

If one doesn't look like a clear winner it may not hurt to experiment and see which is cheaper to run.
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Old 07-14-2009, 11:15 PM   #32
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Propane is roughly 90,000 btu per gallon. Heat pumps produce very roughly 10,000 btu per kilowatt hour.

No telling what the efficiencies of your heat pump and furnace.

If one doesn't look like a clear winner it may not hurt to experiment and see which is cheaper to run.
Assuming the furnace is 80% efficient, and propane costs $4/gal, the cost per 10 kbtu of heat is $4/gal * 1 gal/90 kbtu *1 kbtu input/.80 kbtu output= $.056 for 10 kbtu

The Duo-Therm heat pump puts out 15,000 btu on 16 amps (assuming the efficiency of the heat pump mode is similar to the efficeincy of air conditioner mode). At 120 V that is 120 * 16 = 1920 watts. 15000 btu/1920 watts = 7.8 btu/watt. Producing 10K btu requires 10,000/7.8 = 1282 watts. At $.10/kwh the cost per 10K btu is 1282 watts * 1 kwh/1000 watts * $.10/kwh = $.13 for 10 kbtu

If my pricing and math are right, it looks like the heat pump costs twice as much to run as the furnace.
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Old 07-15-2009, 12:24 AM   #33
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Assuming the furnace is 80% efficient, and propane costs $4/gal, the cost per 10 kbtu of heat is $4/gal * 1 gal/90 kbtu *1 kbtu input/.80 kbtu output= $.056 for 10 kbtu
I'm sleepy right now but I think you have the decimal over an extra place on the propane. (actually .56 instead of .056). But maybe after a night's sleep I'll think otherwise.
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Old 07-15-2009, 08:15 AM   #34
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does the cost of the power for the furnace blower fan factor into this?
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Old 07-15-2009, 08:25 AM   #35
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I have tried the heat pump in or trailer a few times just to see how well it worked. Having said that, my choice is just to use one of the $20 ceramic "cube" heaters when I need a little heat to save wear and tear on the trailer's AC unit. We just move the small heater from one end of the trailer to the other depending on need.

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Old 07-15-2009, 08:44 AM   #36
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I have tried the heat pump in or trailer a few times just to see how well it worked. Having said that, my choice is just to use one of the $20 ceramic "cube" heaters when I need a little heat to save wear and tear on the trailer's AC unit. We just move the small heater from one end of the trailer to the other depending on need.

Brian.
I agree with you. It really doesn't take many BTUs to heat a small trailer when the outside temps are in the 30s and 40s, and a simple electric heater is quiet. We like to sleep with the windows open in weather down into the 50s and it's annoying to listen to the neighbors LP furnace cycling on and off like a big blowtorch.
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Old 07-15-2009, 08:51 AM   #37
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I'm sleepy right now but I think you have the decimal over an extra place on the propane. (actually .56 instead of .056). But maybe after a night's sleep I'll think otherwise.
I think you are right... I divided by 90 when I should have divided by 9 to get cost per 10,000 btu. New version is:
Assuming the furnace is 80% efficient, and propane costs $4/gal, the cost per 10 kbtu of heat is $4/gal * 1 gal/9 10Kbtu *1 kbtu input/.80 kbtu output= $.56 for 10 kbtu
The heat pump is still at $.13 for 10 kbtu, so running the furnace costs 4X the heat pump!

The cost of electricity to run the furnace fan should be small, probably less than the errors in my estimates for the calculation, so I'm not including it.
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Old 07-16-2009, 10:08 PM   #38
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Cool

Our heat pump is great for our 23' coach. We plug in a small fan to circulate the air a little better. We like the hum. The furnace is wonderful, even, quiet heat (having the bathroom warm is great too) but we do most of our touring down south. If it gets too cold at night, out furnace automatically cuts on. Also, with our thermostat back by the bed, we can get too warm up front with the furnace going most days. I have also run out of propane totally on a long stay without a decent fill-up plan (true confessions) and had to make a trip to the local quick mart to pick up a 20# tank to rig for the night. It's OK, I use it for my grill.
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Old 10-28-2016, 08:58 PM   #39
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Ceramic heater vs. heat pump vs. lP furnace

After 15 yrs. of camping, we finally came to the conclusion that we use a ceramic heater as our mainstay, since I am a light sleeper. We use the heat pump in the mornings and early evenings in cold weather, less than 32 deg. We use the lP furnace only below 32 deg. As it really uses a lot of LP and fogs up the windows. Use as much of the RV Parks electricity as you can, because you are paying for it, anyways.
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