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Old 09-25-2019, 10:59 AM   #1
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90+ Degrees with 1 A/C Unit

The original owners of our Carri-Lite ordered only 1 air conditioning unit (15,000 BTU ducted throughout the trailer) since they kept it at a park in Michigan. We are mostly in Florida and once the temp is 85 and above, it's just not capable of keeping it cool inside. The trailer is pre-wired for a 2nd rooftop unit. But before spending the big $$ on that, I decided to try a cheap portable A/C unit.

I bought an 8,000 BTU portable for around $250. It works unbelievably well. In fact, we now use it as our primary A/C (I'd rather burn this out then the rooftop unit). At about 85-90 degrees outdoors, we also turn the central HVAC fan on manual to circulate the cool air through the ductwork. Above 90, we turn the main central A/C on (with the portable running also). It is chilly inside even with outdoor temps in the mid-90s.

Easy install if you have the floor space. I vented it out a small openable window with an adapter I made to replace the screen.

So if you need extra cooling, these portables are definitely an option.
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Old 09-25-2019, 12:52 PM   #2
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Good job. If it works then it's the thing to do. What about condensation of the portable unit?
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Old 09-25-2019, 05:01 PM   #3
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It evaporates normal condensation. If humidity is extremely high, it will trigger an alarm and shut down. It can also be run as a dehumidifier and has a drain attachment. Pretty sure they all operate this way.
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Old 09-25-2019, 05:57 PM   #4
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just a dehumidifier running will dry the air out and make the rooftoo more efficient. Drier air is easier to move resulting in more airflow.
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Old 09-25-2019, 06:23 PM   #5
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Good for you!
You have found a cheap solution for your problem, and are passing it on to others !!
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Old 09-26-2019, 11:42 AM   #6
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BTW, there's confusion regarding BTU ratings on portable A/C units. I think this year's models are the same standard as other HVAC equipment, but older units and some still use an obscure rating that grossly over-states capacity. I went with the room size rating, which was 350 SF on my portable.
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Old 09-26-2019, 03:10 PM   #7
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Great idea. Some donít work so great. Whatís the make and model of yours?
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Old 09-26-2019, 07:02 PM   #8
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Something to think about
I too have a Carriage with one unit that I had to replace two years ago.
Had a Carrier but they got out of the RV market so replaced with a Atwood 15000 Btu supposed to equal a 18000 Btu. In Full sun on Cape Cod outside temp is 100 plus in the summer I can maintain 80-82F and it's cool and dry enough but plan on traveling the country next year.
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Old 09-26-2019, 07:17 PM   #9
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Quote:
Originally Posted by 08Carriage View Post
Something to think about
I too have a Carriage with one unit that I had to replace two years ago.
Had a Carrier but they got out of the RV market so replaced with a Atwood 15000 Btu supposed to equal a 18000 Btu. In Full sun on Cape Cod outside temp is 100 plus in the summer I can maintain 80-82F and it's cool and dry enough but plan on traveling the country next year.
Did your Carrier have the remote control thermostat and controls? If so, how did you manage the controls?
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Old 10-01-2019, 06:44 PM   #10
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It did and new AC units do not.
You have to aim at the new wall mounted controller.(or push the buttons on the controller)
The dealer ran wiring across inside the ceiling to the dry goods closet and down inside the closet, came out like it had been there the hole time.
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Old 10-03-2019, 02:13 PM   #11
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The portable AC unit I have is a Magnavox P-08NPE 8,000 BTU. It was a cheap clearance item purchased at Ollie's discount store (didn't want to spend much in case it didn't work well). One thing I noticed is it has a large 6"-diameter vent. Others I looked at had 4"-5" vents.

I also read about dual-vent units - with an inlet and an exhaust hose. These eliminate negative pressure inside the RV caused by a single vent unit like mine. They are more expensive and use more electricity. I haven't noticed any adverse affect from the negative pressure.

BTW: my original Carrier unit is still going strong (knock on wood ...)
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Old 10-06-2019, 10:48 AM   #12
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Originally Posted by AtomicRT View Post
The original owners of our Carri-Lite ordered only 1 air conditioning unit (15,000 BTU ducted throughout the trailer) since they kept it at a park in Michigan. We are mostly in Florida and once the temp is 85 and above, it's just not capable of keeping it cool inside. The trailer is pre-wired for a 2nd rooftop unit. But before spending the big $$ on that, I decided to try a cheap portable A/C unit.

I bought an 8,000 BTU portable for around $250. It works unbelievably well. In fact, we now use it as our primary A/C (I'd rather burn this out then the rooftop unit). At about 85-90 degrees outdoors, we also turn the central HVAC fan on manual to circulate the cool air through the ductwork. Above 90, we turn the main central A/C on (with the portable running also). It is chilly inside even with outdoor temps in the mid-90s.

Easy install if you have the floor space. I vented it out a small openable window with an adapter I made to replace the screen.

So if you need extra cooling, these portables are definitely an option.

I have a portable AC setting in my Den, It would be nice to use it in my 5er. Would you post a better photo of your window install for the vent
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Old 10-06-2019, 10:53 AM   #13
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for a more perament solution, i would install a mini split. We have two 12k in our 40' Teton. We can get it any temp we desire.
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Old 10-06-2019, 06:45 PM   #14
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Sounds like a very nice setup Glenn. For this, my goal was to see if the problem could be solved for a couple of hundred bucks before deciding on something permanently installed.

danny - there are small (about 8x14 inches) openable sections at the bottom of the tall narrow windows at the back of our trailer. The screens pull out. I removed the screen material (the screen would significantly restrict air flow) and made a panel out of corrugated vinyl sign material from Lowes. I needed something that could be easily cut with an Xacto knife so I could cut the hole to mount the hose termination that came with the AC unit. I riveted the panel directly to the metal screen frame. I initially just had a cardboard panel taped on to the screen. After seeing that it was going to work, I made the more permanent panel.

Depending on window size, the adapters for house windows that come with the units might work too.
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