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Old 12-18-2016, 07:42 AM   #1
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Condensation?

Good morning,

We have been staying way too far north and have experienced wild temp changes. This morning we had a soaking wet windshield as well as entry door and bottom steps. The humidity outside is around 97% and around 48% inside. Outside temp is 26 degrees. Any recommendations?

Seasons Greetings and safe travels,

Tom
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Old 12-18-2016, 08:57 AM   #2
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With the shades down you are trapping air that condenses on the cold glass. You need to move the air around. If you are in a position to do so raising the shades when you go to bed would help. Otherwise put towels along the bottom of the windows to catch the water.
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Old 12-18-2016, 09:29 AM   #3
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You have over head fans for the windshield with three settings, if the low setting does not bother you while sleeping try that setting and see if your windshield is clear next morning.
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Old 12-18-2016, 09:35 AM   #4
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Assuming you are using heat pumps on the roof, set the recirk fans manual/high. It is important to keep the return filters clean. I bought a spare set of filters and change them once a week (minimum).

This air movement will help your condensation problems along with raising the blinds when you can.
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Old 12-18-2016, 09:39 AM   #5
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You have over head fans for the windshield with three settings, if the low setting does not bother you while sleeping try that setting and see if your windshield is clear next morning.
The problem is the fans only work when the ignition is turned on.
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Old 12-18-2016, 09:52 AM   #6
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We always use the towel method of collecting water off the windshield. It only happens when it is cold enough to require the furnace instead of the heat pumps.
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Old 12-18-2016, 09:52 AM   #7
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Assuming you are using heat pumps on the roof, set the recirk fans manual/high. It is important to keep the return filters clean. I bought a spare set of filters and change them once a week (minimum).

This air movement will help your condensation problems along with raising the blinds when you can.
I think that at that low a temperature the heat pumps aren't going to work so the Oasis furnace will be in use. But that doesn't mean you can't us the a/c fans to circulate the air. If the thermostat is set to Furnace in both zones then you can still set Fan to low even though the a/c or HP is not on.
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Old 12-18-2016, 10:30 AM   #8
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Good answers already posted.

I would be concerned with venting what seems to be quite a bit of moisture. It will also condense in the walls and other places best left dry. When cooking and showering run the exhaust fans to vent moisture.
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Old 12-18-2016, 10:47 AM   #9
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We keep the ceiling fan in the rear bathroom going all night on the slowest speed and a window cracked open just a bit in the front of the coach, otherwise we have the same problem.

It's just enough to draw the moist air out from our breathing.
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Old 12-18-2016, 11:11 AM   #10
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I am assuming Tom has 3 roof units so here is what he could do if money was no object. Set Zone 1 and 3 to Furnace but set Zone 2 to Cool. You may have to tweak the temperature setting but this way you are basically creating a dehumidifier, which is what you need. Or you could go out and buy a cheap dehumidifier if this is going to be an ongoing problem. That's what I did when we were living on a boat and had that issue.
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Old 12-18-2016, 11:18 AM   #11
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Algoma, can the ACs work in low temps? I have used similar method with temps above freezing. 1 and 3 in HP mode and 2 in AC mode.

Tom
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Old 12-18-2016, 11:34 AM   #12
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Same issue here. Air movement works if humility to not too high. Am off this afternoon to buy a Haier 30 pint dehumidifier. Others have used these and the GE model to good effect.

Mark and Louene Hetrick
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Old 12-18-2016, 12:11 PM   #13
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It's all about dew point and dew. Look it up and you will find out more than you want to know.

The more air you blow on a cold surface like the glass the more water you will condense out until you heat the glass up close to room temperature. Given the poor insulation value of glass that is a lot of BTUs literally going out the window. A heavy curtain that drops to the floor with some sag to form a seal will trap cooler air near the window reducing the amount of heat loss and condensation.

47% is high humidity inside with the temperatures in the snow areas right now. Typically in a S&B you would be very dry because of the larger volume of air being heated. In an RV the problem is low air volume to less air to hold the moisture generated. Get a dehumidifier and take the moisture level down into the 30% range if you can handle it. (some folks cannot for health reasons).
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Old 12-18-2016, 12:13 PM   #14
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Algoma, can the ACs work in low temps? I have used similar method with temps above freezing. 1 and 3 in HP mode and 2 in AC mode.

Tom
I honestly don't know under what conditions they would have a problem. Give it a try and let us know.
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