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Old 07-24-2012, 09:08 AM   #15
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Yes, use the air condin to cool the air and the dehumidifier to ake the humidity down to a comf level. That way you can cool the air to only 80 to 84 degrees and have it feel much more comf. Fans help also. I am talking about the summer heat here. Jim
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Old 07-24-2012, 09:18 AM   #16
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Our experience is on the far end of the spectrum, camping in ultra high humidity, lots of air exchange (opening and closing the door), marginal cooling capacity and such. We have typically used a dehumidifyer and believe it helps.

From my perspective in our situation the AC is spending all of it's efforts in condensing the air and dumping water out the drain, very little additional capacity is available to cool the air. Everytime we open the door the cycle starts over. By adding the dehumidifyer, it pumps out the water allowing the AC unit to actually cool the air.

There are too many variables but it would be interesting to do an energy study to see it the minimal heat gain from a 200-300 W dehimidifier is enough to get the interior 'over the humidity hump' and get the AC in a cooling situation verses no-win de-humidifying mode.
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Old 07-24-2012, 11:04 AM   #17
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Originally Posted by HiHoAgRV View Post
Our experience is on the far end of the spectrum, camping in ultra high humidity, lots of air exchange (opening and closing the door), marginal cooling capacity and such. We have typically used a dehumidifyer and believe it helps.

From my perspective in our situation the AC is spending all of it's efforts in condensing the air and dumping water out the drain, very little additional capacity is available to cool the air. Everytime we open the door the cycle starts over. By adding the dehumidifyer, it pumps out the water allowing the AC unit to actually cool the air.

There are too many variables but it would be interesting to do an energy study to see it the minimal heat gain from a 200-300 W dehimidifier is enough to get the interior 'over the humidity hump' and get the AC in a cooling situation verses no-win de-humidifying mode.

Bingo, the last few posts are starting to zero in on my questions. I guess experimenting is in order in various temp/humidity levels. I absolutely wonder..."it would be interesting to do an energy study to see it the minimal heat gain from a 200-300 W dehimidifier is enough to get the interior 'over the humidity hump' and get the AC in a cooling situation verses no-win de-humidifying mode" as you stated.

Somewhere there is a btu "break even". The btu's of cooling power lost to condense the humidity out of the air vs the btu's of heat put into the AS which the A/C has to deal with and overcome.
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Old 07-24-2012, 01:08 PM   #18
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Let me add another cog to the mix here....
My dehumidifier has both a humidistat and an automatic pump. The humidistat allows the RH% setting to be modified to a desired level and the unit turns on/off accordingly. When I am not using the AS and it is in the driveway, i have the unit set at about 45% (no AC running), it runs quite a bit which is what I am intending for it to do. The unit could be easily be set at 75% or so with the pump on that will allow it to be hands free and more of a "supplement" to the AC unit automatically when the RH% in the AS reaches higher levels that are outside ideal (this may be from cooking, doors opening, showers, etc) and then cut off once the RH% lowers to a more acceptable range. You would have less of the heat gain from a constantly running DH unit and the AC can do what it is supposed to do.
Food for thought.
FYI here is my DH unit:
Air Treatment - Dehumidifiers - 45-Pint Capacity DD45P - De'Longhi USA
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Old 07-24-2012, 04:05 PM   #19
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Thanks, already have a DH and a humidistat, just only used it during cold weather.

NewAir AD-250 25 Pint Portable Room Dehumidifier With Automatic Shut-Off - FREE GROUND SHIPPING!
Dayton 1UHG2 Dehumidifier Control, Plug In 120 V
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Old 07-24-2012, 04:50 PM   #20
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We have a large window unit (25k BTU) in the front of our house (1400 square feet) and run fans to circulate the cool air throughout the the house. I lucked out and found a brand new dehumidifier with a dent in the plastic on the top for $5 at a flea market. I keep it running in the bathroom (in the back of the house), and it does make the air feel more comfortable in that end of the house. I don't know what it's costing us to run the dehumidifier, but with the summer we're having in Arkansas, it's worth it.

When I get an Airstream, I'll keep a dehumidifier running in it when it's not being used to avoid mildew.
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Old 07-25-2012, 01:24 AM   #21
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If your cooling capacity is marginal why not just get another small window or portable AC unit. It too will dehumidify and as an added bonus cool as well. When you don't need it don't use it. Sometimes you guys make things way to complicated. Something I am usually very good at.

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Old 07-25-2012, 06:32 AM   #22
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The OP asked about a dehumidifier not a second Aircon. Yes a small second unit might work. Jim
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Old 07-25-2012, 06:37 AM   #23
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The real benefit of having a dehumidifier running is to keep the inside of the trailer from getting damp and moldy. When you go inside on the hottest day, it feels dry. That is a real jump start for your AC as well. It will cool it down faster. Definitely worth having if you have the space and are on shore power... and, in the HEAT!
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Old 07-25-2012, 07:38 AM   #24
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I run a dehumidifier for when I am away from the trailer (8-14 hrs daily) in combination with the AC set to a higher temperature. My "utility bill" (at the RV park) is high, relatively, but after a long day of work in & out of humid 95-105F temps, I am pleased to come home to cool, dry & comfortable air. I use a floor standing, rolling dehumidifier purchased at LOWES a few years back for the last trailer. I usually need to dump 1-2 gallons of water once at home (toilet fill, or used for cleaning [distilled]).

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Old 07-25-2012, 08:11 AM   #25
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I had never even considered buying a dehumidifier before reading this thread. I went to 5 local businesses yesterday after work. Only one even carried them and they only had one model for over $200. Other suggestion was use a small window type AC unit. This I can buy for under $100 almost anywhere. Not sure I want to go this route as I would have to remove a window and really don't wish to go that far. Most of my windows barely work as it is. Does anyone have any suggestions for an affordable dehumidifier that would do a proper job of it in a 17ft Bambi II?
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Old 07-25-2012, 08:20 AM   #26
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Check post # 19 links. I bought this one because of it's compact size and small 25 pint capacity. It has been plenty large enough (capacity) for my 30'er in the cool weather. I will use it this weekend in some nasty hot humid weather in southern Illinois along with the A/C and report back.
I have seen cheaper ones at the big box stores, just shop around for awhile. I just wanted the easy to store size. I bungee mine inside the closet. Far less bulky than the higher capacity ones. 25 pints are not as common. a couple of other brands out there as well.
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Old 07-25-2012, 09:21 AM   #27
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dznf0g: That looks just what I need. Just placed my order, Thank you,
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Old 07-25-2012, 12:55 PM   #28
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dznf0g: That looks just what I need. Just placed my order, Thank you,
You're welcome. did you get the humidistat as well, or are you just going to run it "full bore"?
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