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Old 10-07-2015, 01:07 PM   #15
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Originally Posted by Jacob D View Post
Add gas heat to the list of moisture sources. Running A/C and furnace together is a good idea. I enjoy cool sleeping weather so I open windows wide, put on an extra blanket and snooze away. Any breeze will keep the inside dry unless it is raining. With shore power, I use an electric heater which does not give off moisture as gas heat does.
Burning propane does produce water vapor in the combustion exhaust, but with the Airstream furnace that exhaust is all vented outside the trailer. Same with the water heater and the fridge. However if you use an unvented propane catalytic heater or cook with the gas range that water vapor is released inside the trailer.

So heating with the furnace will not add to the moisture level, and when used with an open window or roof vent can help remove moisture. Warm air can take up more moisture than cool air, and thereby vent more moisture from breathing, showering, cooking to the outside.
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Old 10-07-2015, 01:21 PM   #16
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In the morning, lift up the mattress and check for dampness. Especially if there are 2 of you, your bodies produce moisture all night that can collect on the colder side of the mattress. It's a scary hidden place to find mold. I use Hypervent material under the mattress to keep it from turning into a mold problem. It's the only safe way I've found to keep the cabin temp lower and use an electric blanket to save on heating costs.

HyperVent Marine - Putting An End To Condensation

You can also add lots of slats/dowels under there, or drill lots of holes in the platform, but that can make the bed colder.

I also use a small dehumidifier. It's a pain, and noisy, but essential to prevent mold. Don't buy a thermoelectric one (no Peltier units) — it won't function at the lower temperatures in your cabin -- if you read the fine print they only reach peak effectiveness above room temperature (in the 80s). So you need one with a compressor. A bonus is, it produces some waste heat.
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Old 10-07-2015, 01:28 PM   #17
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I use this dehumidifier in the winter. It's kind of noisy, but it can collect more than a quart of moisture overnight -- just from one person breathing vapor into the air!

http://amzn.to/1j8KSOz

If anyone else has a unit they use, love and swear by (not swear at), I'd love recommendations on quiet small units. If you can tell how much water it pulls from the air overnight (in ounces, etc) that'd be amazing.
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Old 10-08-2015, 01:45 AM   #18
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+1 for hypervent. It's great stuff.

We also have vent covers for our fantastic fans which allows us to leave them open at least a bit in nearly any weather. This definitely helps.
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Old 10-08-2015, 01:57 AM   #19
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You breathe, you cook, you bathe - all put moisture in the air that collects on cold surfaces and can find its way to your plywood subfloor and in a few years be an even bigger problem.
Open a window or vent, use a dehumidifier, run the AC and heat together (so the AC acts like a dehumidifier).
Ok, I'll bite. How do you run the A/C and heat together.


George
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Old 10-08-2015, 06:45 AM   #20
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We have experienced this problem. When we turn on the heat pump, it gets worse. What we have been doing is to turn on the gas furnace to heat up the trailer a bit. Then we switch over to heat pump. This seems to do the trick for us.

Brian
We do exactly as Moostags, PLUS we open the one fantastic vent we have and leave it open all night, just about an inch or so. The fan is not on. With the two of us and two Labrador Retrievers there is a lot of moisture in our unit and doing the above the only time we can see condensation is in rainy cold (below 50) weather.

The vent seems to be key.
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Old 10-08-2015, 08:54 AM   #21
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With just one person I get by with leaving the shower and bathroom vents open. I do notice that if I forget to turn on the fan while showering a LOT of condensation forms inside.

I don't ever let the teapot boil for a long time, or do a lot of indoor cooking - heck with my induction burner I can boil spaghetti or make soup outside.

When I've had guests I've definitely noticed that the moisture builds up fast even if they're just staying for a couple of hours. BTW if you wash out anything by hand, hang it outside or it's likely to mildew before it dries.

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Old 10-08-2015, 09:10 AM   #22
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Ok, I'll bite. How do you run the A/C and heat together.


George

Turn them BOTH on ...
Andy mentioned it in another thread, or perhaps this one, personally I think it's silly.
We have a very small dehumidifier, works fine, isn't noisy, no drain hose ...
https://www.eva-dry.com/dehumidifier...-dehumidifier/
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Old 10-08-2015, 09:20 AM   #23
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Turn them BOTH on
Not in newer units with the electronic thermostat. It controls heat and a/c and only does one at a time.

Opening vents works fine for us, which is one of the reasons I switched to MaxAir fans- they stay open and run even in the rain.
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Old 10-08-2015, 09:35 AM   #24
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We always had condensation issues. Nothing we did with various vents etc helped much. Actually it didn't help at all. That said we sleep 5 in our AS (2 adults and 3 kids). I forgot the numbers, but I looked up how much water vapor a person exhales at night and it was surprising. I finally bought a dehumidifier, and we've had no condensation since. Best purchase I've made for the AS! It does make some noise, but we always sleep with white noise (we usually turn the AC fan on low and let it run all night). With the AC fan running you don't even hear the dehumidifier.


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Old 10-08-2015, 10:53 AM   #25
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Add gas heat to the list of moisture sources. Running A/C and furnace together is a good idea. I enjoy cool sleeping weather so I open windows wide, put on an extra blanket and snooze away. Any breeze will keep the inside dry unless it is raining. With shore power, I use an electric heater which does not give off moisture as gas heat does.
How does gas heat put moisture inside any building. Gas heat must be direct vented or you run the risk of carbon monoxide. That is why both a trailer furnace and hot water tank draw in combustion air from outside and vent directly outside. If you are using an infra red gas heater you should have a window open to replenish combustion air.
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Old 10-08-2015, 06:26 PM   #26
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In addition to venting with the fan off, What do you do about shades and curtains? Use nite shades? Day shades? No shades but use curtains? No curtains? We just had 10+ days of rain getting i to the 50's at nite and condensarion IS an issue...better when we left windows without curtai s or shades( except in the bedroom) and it made a difference- will try fan vent tonite....I love this forum!
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Old 10-08-2015, 06:53 PM   #27
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At night we pull down the shades and close the curtains in the wrap-around windows, but the skylights and the oval windows that look upward are usually un-shaded. If we have electric and it's above 40F outside, we set the heat pump to ~60F and leave the vents open. If below 40F and/or no electric, we run the furnace at a slightly lower temp and still leave the vents open a bit.

Your mileage may vary depending how many folks are in the trailer, how cold it is outside, how humid the air is, and how low you're willing to set the thermostat.

We also have a pair of what we call "Liberace Robes" which are actually fake sheepskins. They are wonderful for wearing about the trailer over our shoulders while relaxing, and for tossing on the bed for those long cold nights. Product Categories FAUX FUR THROWS |
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Old 10-08-2015, 07:56 PM   #28
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We leave the bathroom window open 3" all the time while camping.

If its cold we use a cube heater set on low in the middle of the trailer pointed toward the bathroom.

It works like a charm and no condensation.
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