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Old 02-17-2019, 09:29 AM   #1
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AC not removing humidity

Folks I'm in Florida for the first time and my AC is not removing moisture from the air. It cools fine except no moisture removal. I have an 2016 APEX 215rbk with a fairly standard Dometic AC.

Is this normal or is there a possible vent line on the roof unit plugged up or sealed up from factory?

I have a couple of temp/humidity gauges lying around because I am usually concerned with low humidity on previous travels in the Rockies, where its typically quite dry, especially in the fall inside a camper. The relative humidity reading actually goes up as it cools down here indicating little/no moisture removal. I've used the AC a few times but only in a dry climate so it might have been acting this way from the beginning.

I've been using campground showers and have done no cooking on the stove to contribute to moisture. I even leave my towel in the car to cut down on water in the trailer.

If its a vent line on the roof unit, any idea what I should be looking for? Do I need to take the cover off? Thanks.
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Old 02-17-2019, 10:41 AM   #2
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When I'm in FL and other high humidity areas the water coming off the roof is quite substantial compared to drier climates (some places no run off). Maybe you should remove the shroud (cover) and have a look see. Remember though the AC is not exchanging outside/inside air and any openings to the outside don't help.
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Old 02-17-2019, 10:45 AM   #3
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No need to tell you Florida humidity is crazy tropical compared to what you are used to. I would compare your hygrometer reading inside to what is outside. If your inside reading inside is below 70%, I'd say you're not bad. 55% would be ideal. If you have condensate dripping off roofline from A/C unit, which is what I would expect in Florida, I'd say it is working.
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Old 02-17-2019, 05:59 PM   #4
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Assuming it's just the Florida humidity and your A/C is working ok, you way want to look at one of the smaller dehumidifiers (say a 30 pint model?). They are not expensive and only run on about 3.5amps of AC power. You could attach a short hose and just sit it in your shower to drain into the grey tank when hooked to power and sewer.

It probably also depends on how we used our trailers as to how much extra moisture *WE* are adding to the air from showers, cooking, and just breathing. Start with 98% and up in Florida and that's a lot to ask from a roof top A/C unit.
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Old 02-17-2019, 09:32 PM   #5
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be very sure unit is closed up. Roof vents all closed? Windows all closed? No outside air intrusion.
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Old 02-17-2019, 09:35 PM   #6
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Use a laser temp gun. measure return air and supply air 18 to 20 degrees differential is all you can expect.
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Old 02-17-2019, 09:56 PM   #7
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If cool air is coming out of the vent then moisture is condensing on the cooling fins inside the AC unit... where is the condensate going from there? Well you will have to crawl up on the roof and take the top half of the shroud off and take a look... My condensation flows out onto the roof and drips toward the lowest part of the roof and out the gutter spout.

BUT it is not possible to get cool air out of the AC without making some water come out of the air.
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Old 02-17-2019, 10:01 PM   #8
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Welcome to the south! You are in a humid environment where the relative humidity is high. When the air is cooled, the less water it can hold. As a result, the relative humidity will rise because the air can not hold as much water. If you are getting condensation running off the roof from the A/C everything is probably working as it should.
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Old 02-17-2019, 10:52 PM   #9
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What humidity levels are you reading..
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Old 02-17-2019, 11:02 PM   #10
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Been living in Florida forever. This is not humid. If you think so just come back in August or September when it is.
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