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Old 07-02-2023, 05:16 PM   #1
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Dehumidifying

Oh my gosh; am visiting daughter in NC. It is so humid here! What do people recommend for keeping the humidity in check? I’m FT in a 32’ Jayco Melbourne. This humidity can’t be good for the motorhome!
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Old 07-02-2023, 05:21 PM   #2
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Quote:
Originally Posted by marycontrary View Post
Oh my gosh; am visiting daughter in NC. It is so humid here! What do people recommend for keeping the humidity in check? I’m FT in a 32’ Jayco Melbourne. This humidity can’t be good for the motorhome!
Hello, you have a built in dehumidifyer on your roof, just turn your a/c on. Pretty sure that humidity alone is not going to kill your rv, if it did people would not be living in them in Florida. Good luck, lol.
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Old 07-02-2023, 05:21 PM   #3
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While in storage or are you living in it?
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Old 07-02-2023, 06:09 PM   #4
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I use 6 damp rids
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Old 07-02-2023, 08:59 PM   #5
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Sorry, forgot to mention, daughters house does not have a 30amp plug, so am tied into their 110, which will not run the AC without tripping something. I dont use the ac during the day as Im not in the rig much, but at night have been running the generator for ac for an hour or so just to cool it down some. Hope to be moving to another location that has better elec next week. Everything feels damp in here? Ick.
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Old 07-02-2023, 08:59 PM   #6
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Living in it
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Old 07-02-2023, 09:31 PM   #7
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Live with it

if you can't run the a/c. A dehumidifier will and heat to the inside.
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Old 07-02-2023, 09:35 PM   #8
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See post #4, It is now sold in buckets that last a long time, downside_ you must keep all doors and windows closed 24/7 for it to work properly.


You are right to be concerned about mold/mildew. If you spot any, buy a spray bottle of Concrobium mold and mildew eliminator.
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Old 07-02-2023, 11:58 PM   #9
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Originally Posted by marycontrary View Post
Sorry, forgot to mention, daughters house does not have a 30amp plug, so am tied into their 110, which will not run the AC without tripping something. I dont use the ac during the day as Im not in the rig much, but at night have been running the generator for ac for an hour or so just to cool it down some. Hope to be moving to another location that has better elec next week. Everything feels damp in here? Ick.
How far away is the nearest 15 amp receptacle? It's not ideal but a single a/c unit will most likely run ok on one if it's not too far away and used with a good 12 or 14 gauge extension cord. You'd probably need to turn everything else off and you'd want to monitor the connections to make sure they weren't getting too warm. Doesn't have to be cold in there, just need to set the thermostat so that the a/c does cycle on from time to time.

I did that with our 14,8k btu roof top unit a couple of times before I installed 30 amp service. Using a 25 foot cord with the 30/15 adapter, voltage showed a decent 115 volts (dropped about 4 volts) in the motorhome with the converter/charger and a/c running.

Edited to add: Living in SE Texas, I do use a dehumidifier when in storage. It works great but the expense may not be worth it since you have around a week before moving. I did try the damp rid stuff before getting the dehumidifier and it did take some moisture out of the air. Wasn't enough though.
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Old 07-03-2023, 07:52 AM   #10
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A Supco SPP6 Hard start kit can mean difference between starting or not with 15-20 amp . At about $15 and 30-60 minutes to install. Soft start is about $300 much easier to start ACs.
It helps if batteries are at float range or reduced charge via inverter control if equipped. Fridge and WH on LP obviously.
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Old 07-06-2023, 03:38 PM   #11
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This link

Get this, put the drain tube in the sink.

https://www.walmart.com/browse/home-...112918_2340010
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Old 07-06-2023, 08:02 PM   #12
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Originally Posted by shepardmike
Get this, put the drain tube in the sink.

https://www.walmart.com/browse/home-...112918_2340010
Pretty much. My canned thoughts on dehumidifiers:

Short version:
They work very well if sized properly. "Sized properly" means an adequate "pints per hour" rating and a decent-sized tank. I'd prefer a tank size of closer to 1 gallon than to 1/2 gallon.

Long version:
Good dehumidifiers are rated in "pints" and use a compressor, essentially a small air conditioner in design but without the cooling.

The "pint" rating is the number of pints of water that can be removed from the air in 24 hours under optimum conditions. There are 8 pints per gallon, 128 ounces per gallon, and 3,785 milliliters (ml) per gallon.

We use a 30 pint unit in our 38' motorhome (about 300 sq. ft.) and it removes 0.4 gallons of water overnight. I know because that's the tank size and it beeps that it's full between 10 and 12 hours day or night when we set it to 50% humidity. 🙂
----------
BUT 30 pints is the equivalent of 3.75 GALLONS yet ours barely removes 1/3rd to 1/4 of that in 24 hours of running continuously.

Supposedly, our 30 pint compressor dehumidifier is good for 1,500 square feet but our motorhome is only about 300 square feet.

The takeaway is to buy LARGER than the advertised "square foot" rating because the manufacturers lie. 🙂
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In a shorter RV that 30-pint unit would lower the humidity faster and its tank would fill more slowly. A friend with the same 38' motorhome uses a 70 pint unit and his unit drops the humidity a lot faster than ours.

When in Florida for the winter I need to empty the 0.4 gallon tank twice a day and sometimes three times a day.

That means our 30-pint dehumidifier is removing 0.8 GALLONS of water each day from the air and sometimes more. Yes, we keep the entry door closed and the windows and vents closed.

To be honest, that 30-pint unit sometimes struggles to lower the humidity so I'll go with a 40-pint or larger unit with a larger tank next time. We keep the dehumidifier in the bedroom set to 50% humidity and it rarely shuts off. A humidity percentage meter in the main living area sits in the 50's generally and only occasionally drops into the 40's. Yes, this is with both air conditioners running almost constantly.

Some inexpensive dehumidifiers use "Peltier" technology and are rated in "ounces". A large Peltier unit is 95 ounces but 95 ounces is only 6 pints of water removed from the air in 24 hours under optimum conditions and there are 8 pints per gallon. Yet people think that "95" is a big number so that's good. But it's not.

0.4 gallons, what ours removes overnight, is equivalent to 51 ounces. Or about 3.2 pints. But you'll never see that in real life.

In summary, the amount of water that can be removed from the air is what's important, not some "square foot" rating because people live in cubic feet. The advertised water removal rate is the absolute maximum and ours performs at about 50% of its advertised rating. So "go large" rather than "just enough".

As a rule, the smaller the size of the tank the lower the performance. A dehumidifier that advertises a 1,000 ml tank only holds one-quarter of one gallon.

Ray
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