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Old 02-27-2008, 08:30 PM   #15
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get the Heat pump/AC/Heat strip como. IT is nice for keeping the trailer warm when the temp is above 40. Belwo 40 I use the Furnace.
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Old 02-27-2008, 09:19 PM   #16
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The heat strip is a firly cheap add with a new AC so that drove me. If I had the cash, do the heat pump (which may have a heat strip for emergency heat). If you still have the gas heater, your covered all around. Some threads even look at adding propane ceramic heaters...and of course there is the wood burning stove...which if done right really works well...until three AM when ya have to put on more wood Yes...there is a law (caution: wood burners require combustion air intake...sorry, the lawyers made me say that)

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Old 02-27-2008, 09:34 PM   #17
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Looking from a different angle

Hi, I'm looking from a different angle; So I have an 11,000 BTU A/C with heat strip and it works fine for me. If you go with an A/C with heat pump, it will have to be a larger unit. [13,500 or 15,000 BTU] I'm hopeing to run my A/C with a Yamaha 2400 generator. They say it should work with an 11,000 BTU system, but not with the larger A/C units. So if you get the heat pump A/C you will have to have 3,000 to 4,000 [generator] watts to run it. Which means one larger, heavier, or two medium size generators. This is only if you plan to have generator power.
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Old 02-27-2008, 10:11 PM   #18
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We have the heat pump unit on our 2005 Safari. We do quite a bit of cold weather camping, and have used both the heat pump and the gas furnace extensively.

We have found the heat pump to work very well down to about freezing when it becomes useless. We then use the furnace.

Brian
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Old 03-23-2008, 08:13 PM   #19
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Consider a Heat Pump

Quote:
Originally Posted by evelitalian
my a/c is shot,i was looking into the a/c heat pump combo,one unit dual purpose,what do you think?any suggestions,anyone have this?
To me one of the most important points when considering a straight AC unit (that cools only) versus a HP unit (that heats or cools) is that the heat pump does not use propane when it is in heating mode it is electric.

Any time the outside temperature is below say 70 degrees F and above 45 degrees F the heat pump does just fine maintaing a comfortable inside temperature.

We have a heat pump in our 2008 International and so far are satisfied with its performance. The HVAC system switches over to propane automatically when the temperature is below 40 degrees F.

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Old 03-26-2008, 09:20 PM   #20
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Rivet Heat Pump

I just, about an hour ago, finished most of the install of a Carrier AirV 15,000 Btu heat pump. The cover can wait till tomorrow morning when itís light again. It is 69 outside tonight, but I would not be surprised to see more cold weather before it really warms up. We had a frost last week. When that happens I will be better able to comment on the heat pump. Mine is designed to switch to its built-in heat strip when the temp drops below the 40s.

Little Rockís weather is usually pretty mild most of the time in winter, so I anticipate getting a great deal of service from the heat pump.
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Old 03-26-2008, 09:30 PM   #21
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Quote:
Originally Posted by evelitalian
my a/c is shot,i was looking into the a/c heat pump combo,one unit dual purpose,what do you think?any suggestions,anyone have this?
Heat pumps wear out much faster, than a regular AC.

When a heat pump is in operation, either in the AC mode or heat mode, the compressor always runs. You basically reverse the two coils, internally.

With a regular AC, the compressor only runs when it's in the "cool" mode.

And as some have pointed out, the heat pump model, when in the "heat" mode, is noisy.

Purchasing a new AC with a heat strip option, costs very little extra, and is not noisy in the heat mode.

Andy
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Old 03-26-2008, 09:38 PM   #22
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Rivet Heat Pump Life in the South

Hi Andy,

Valid point about the life of the unit. It certainly is bound to shorten the life somewhat. However, here in Little Rock or in Georgia where evelitalian is located, it wonít shorten the life very much since it will be cooling most of the time anyway. I did take the effect on the effective life of the unit into consideration.
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Old 04-15-2008, 09:28 PM   #23
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Rivet Cool Weather Update

Well, Arkansas weather came through for a heat pump evaluation. Last weekend we had 75 degrees and a tornado. Night before last, it got down to 34.5 with freeze warnings for last night, but it didnít make it below the previous nights low. Anyway, the heat pump performed very well. My primary heat is an oil radiator with the AC as supplemental heat. The heat pump switched over to the heat strip when the temperature dropped, and when it got back to 40 switched back. This morning I noticed that the heat pump was running and blowing warm air at 36, so I am not quite sure where the switching takes place. It did keep the place very comfortable, though. Iím glad I got it.
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Old 04-17-2008, 03:32 AM   #24
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Might as well chime in here with my 2 cents...we have a heat pump and find it great for day time warming when it's not too awfully cold out...it's noisy at night but so is the AC (and sometimes in AZ you need the AC even at night)...so we are used to sleeping through it...whether it's the heat pump or the AC on... I'd rather use the heat pump and use the electricity we're paying for in a park rather than our propane, though the furnace is more efficient and quieter. I'm glad we have both.
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Old 04-17-2008, 10:27 AM   #25
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Lot's of folks have talked about the "noise" from a heat pump, but in reality the noise is typically the noise of the fan and the air flow. Technically the additional noise that a heat pump generates is the sound of the compressor running and is the same noise that occurs when you are in the cooling mode.

That sound in my trailer is a low hum and is really inconsequential to the noise that the fan and air flow produces. When you have a heat strip you still have the sound of the fan and air flow. From my perspective the difference in inside sound levels between a heat pump running and a heat strip running are really minor. The convenience of the heat pump/AC side being thermostatically controlled is really a plus. Keep in mind that at least with the Duo-Therm thermostat, you can set the heat pump/AC unit to automatic mode which completely shuts down the fan and compressor when cooling or heating isn't being called for, much like the furnace. Again that's something you can only do manually with a heat strip.

Personally I think the furnace and its whine is a lot more annoying that the heat pump.

Jack
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Old 04-17-2008, 12:04 PM   #26
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Jack made a good point about the noise coming from the blower. My Carrier AirV seems to only have 2 speeds, Extra High and Scream like a Banshee. My older Excella doesn’t have an external thermostat like Jack’s, so the difference in the heat pump and heat strip is moot. It’s on all the time.

Here in Little Rock, the AC gets used a lot too, so I am getting used to the sound pretty quickly.
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Old 04-17-2008, 01:39 PM   #27
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Quote:
Originally Posted by vswingfield
Jack made a good point about the noise coming from the blower. My Carrier AirV seems to only have 2 speeds, Extra High and Scream like a Banshee. .
The difference in speeds for most air conditioner fans is really minor since there is a minimal amount of air flow needed to make the system work properly. The Duo-Therm thermostat used on the heat pump units has an excellent option of setting the unit on auto, and cycling the fan and compressor off once you hit set point. It however, has another side which I think is awful. When set to auto, the thermostat determines which fan speed to use. The problem is the decision point as to what fan speed to use. That decision is determined by the difference in the actual trailer temp, and the set point of the thermostat.

For example when doing the initial startup in a hot trailer, my cool set point is 77 degrees. The unit starts up on high producing maximum cooling. Once the inside air temp cools down to 87, the fan automatically kicks down to a lower speed. Bad side is 87 is still obviously too warm. So I have to either kick the thermostat down to a lower temp, to keep the fan up high, or I turn the fan mode from auto to high. Not too bad you say.

Ok here's a much more common scene. I like to use auto since in a cooling mode, it keeps humidity levels fairly low (using constant fan on blows air over the coils when the compressor isn't running thus introducing more humidity into the air). Problem is when you are in full sun hot climes in auto mode (and the trailer is cool to begin with, say early am,), the fan and compressor will cycle in low speed mode. Now the morning heats up and the fan/compressor run time gets longer to get the trailer back to set point. Eventually you reach a point where the fan speed is insufficient to provide enough air flow to provide proper cooling and the temperature starts to climb in the trailer above the set point. Unfortunately the high speed won't activate until the thermostat shows a 10 degree difference, and my trailer now is at 88 degrees before the additional blower speed is activated.

This I think is a bad design and probably in retrospect the auto function should default to high speed once you pass 4 degrees over/under set point. Right now the way we have to deal with it takes some of the auto out of "auto". The same issue happens in heat pump mode where you want fast recovery when entering a cold trailer, or as outside temps start going down. Running constant fan when the compressor is cycling, makes for some cold drafts. A proper auto fan speed selection would make it a lot more comfortable.

Jack
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Old 04-18-2008, 08:21 PM   #28
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Our Safari had just a heat strip and it wasn't worth the effort to turn it on. Our Limited has the heat pump and it works well - much better.

But what works best, when you have AC, of course, is our Vornado. That little thing heats our 31 footer very well - and the temp is pretty constant, top to bottom. And quiet. When it reaches the set temp, it just idles down to near nothing. Great to sleep with.

I've never found anything that works as well.

Pat
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