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Old 08-21-2010, 04:54 PM   #1
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Basement Air - the best you can hope for...

I remember someone in a previous thread mentioning the maximum number of degrees the AC can cool the coach below the outside air temp. Anyone have that number? I have been through a week of 102-107 degree temps in Memphis and the coach was typically 82-84 during those temps. It also seems like the thermostat reads a little high (like 4 degrees worth). I'm thinking this kind of performance is the best I can hope for in those temps - any feedback?
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Old 08-21-2010, 05:27 PM   #2
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The standard is that when an AC is working as designed, it will put out air at a temp of 20 degrees below the air temp at the intake ...that is NOT necessarily the OUTSIDE temp, it is the temp at the ac air intake which is at/near the air filter inside the coach. That said, with the dual compressor unit that Winnebago has in the basement, I have consistently tested my unit at ceiling vents vs intake grill at apx 20 degrees difference with only one compressor running, and apx 40 degrees difference with BOTH compressors running. If on 30a or generator, you should see apx 17 apm on the EMS display when one compressor is running, and 23 amp on the EMS display when BOTH compressors are running.
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Old 08-22-2010, 01:44 AM   #3
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Hi Jim,

1 compressor, 25F. 2 compressors 45F. Outside air 100F, inside temperature 74F or less, but then thats too cold for us. Airflow out the gazoo, its like a hurricane so we never use high fan. Thermal blankets in the windshield, bedroom windows, and bathroom window (see Photos section).

Thermostat on the Adventurer and Journey corrected years ago by adding just the right amount of resistance across the temperature sensing diode. Used a temperature probe for my Fluke Meter and a decade resistance box to determine the correct resistor. I dont remember the value but seems like 100s of kohms was correct.

The Horizons thermostat would have to have a resistor added in series to correct it and since it only reads a couple of degrees high, I elected to leave it alone. We set the thermostat to 78F or 79F and the air temperature is then normally around 76F , which is very comfortable for us.
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Old 08-22-2010, 10:09 AM   #4
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Quote:
Originally Posted by jimjr View Post
I remember someone in a previous thread mentioning the maximum number of degrees the AC can cool the coach below the outside air temp. Anyone have that number? I have been through a week of 102-107 degree temps in Memphis and the coach was typically 82-84 during those temps. It also seems like the thermostat reads a little high (like 4 degrees worth). I'm thinking this kind of performance is the best I can hope for in those temps - any feedback?
From my experience, you're doing about as well as can be expected.
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Old 08-22-2010, 03:21 PM   #5
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Quote:
It also seems like the thermostat reads a little high
Another thought ... the thermostat can be skewed by a ceiling vent blowing on it, of by nearby heat sources. Sometimes that might be helpful, other times not ...
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Old 08-22-2010, 03:41 PM   #6
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I agree with AFChap. I can change the temp in our rig just by redirecting the airflow from the ceiling vents. When I want it cooler, I direct it away. I haven't touched our actual thermostat setting in about a week.
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Old 08-22-2010, 06:19 PM   #7
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The basement air in my coach also has a hard time keeping up if it is real hot. I almost feel the subject of basement air not cooling well enough should be a sticky on the forum. I added a 13,500 btu coleman power saver yesterday. I am a strong believer in backup and if the basement ac fails while you are out on the road, you are screwed. In addition, I feel that while in direct sunlight, even with awnings, shades and everything else you can do, the cooling put out by the basement ac just is not enough to keep up with the heat coming in. The addition of the roof top unit is a piece of cake. Hardest part is snaking the wires.
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Old 08-22-2010, 06:43 PM   #8
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Sounds about right.

We were visiting the grandkids in Platte City MO just north of KC last 2 weeks. Almost every day was above 100. We always ran about 20 to 25 degrees below outside temp. One day it was 106 with a heat index of 112 and the coach stayed around 80 to 85 degrees. Surprisingly it felt comfortable when you came in from the outside.

Now we are back home in Carlsbad, CA and remembered why it cost so much to live here. Today was a blisteing 78 degrees. and in the mornings 68.
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Old 08-22-2010, 07:01 PM   #9
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I have no problem keeping my coach in the 70's when it is 100 degrees or greater outside. I have found the key is to close everything up and start you AC early so your not playing catch up later in the day. Late morning and late afternoon, my AC will cycle. But during the hottest part of the day it will run continuously. I am very pleased with the AC/Heat pump unit.
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Old 08-22-2010, 07:41 PM   #10
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Is the btu's in the basement air on the sun cruisers, the same as the btu's on the larger units? I am saying this bc my basement air just did not do it for me alone. Maybe it works on the shorter units but no way is it keeping me cool as I would like it to. I had a technician look at it and they told me the unit is working as it should be.
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Old 08-22-2010, 08:08 PM   #11
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Quote:
Originally Posted by stardalo View Post
Is the btu's in the basement air on the sun cruisers, the same as the btu's on the larger units? I am saying this bc my basement air just did not do it for me alone. Maybe it works on the shorter units but no way is it keeping me cool as I would like it to. I had a technician look at it and they told me the unit is working as it should be.
I don't know this first hand, but it was mentioned on this forum that the units are the same regardless of the coach size. Also, the basement compressors were made larger in 2009. We got fed up with closing the coach like a cave just to go camping. What good is it to sit there with insulation or whatever covering the windows. Might as well stay home. We added roof air and now we keep the windows uncovered and enjoy camping. We don't have to live in a cave anymore. Joe
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Old 08-22-2010, 08:30 PM   #12
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my basement air does not cool enough in july and august. plugged into 50 amp which has been checked, my green light only shows 30 amp and no green light on comp#2. i'm taking in next week hoping it can be fixed. in the past, it has worked fine.
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Old 08-23-2010, 05:50 AM   #13
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Have been watching these basement air threads for a while now. Mine also seems to struggle when it's real hot outside. So my question is, what tells you whether one compressor or two is running? Could one be bad and you not know it?

Thanks for any feedback
Bobby
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Old 08-23-2010, 08:20 AM   #14
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Originally Posted by droneb View Post
Have been watching these basement air threads for a while now. Mine also seems to struggle when it's real hot outside. So my question is, what tells you whether one compressor or two is running? Could one be bad and you not know it?

Thanks for any feedback
Bobby
When running on the generator look at the amp readout on the "One Place Panel". If both compressors are running it should read around 22 to 24 amps. Joe
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