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Old 05-05-2016, 03:37 PM   #1
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Foggy windows in the morning

Maybe it is just more of a problem because of our cooler and sometimes wetter springs up here near Seattle, but thought I would check with others. If I don't leave one of the roof vents open and one of the fantastic fans running at night when we go to bed, most of the windows in the coach will be fogged up when I raise the night shades in the morning. I hate to waste the extra heat out of the roof vent, but better that than the fogged up windows that take forever to clear up in the morning. Anyone else have this issue? We have 2 adults and 2 kids sleeping in the Berk when we have it out, so that might also attribute to it a bit.
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Old 05-05-2016, 04:10 PM   #2
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Glenn if the nights are cool and night shades down our windows fog up as well. Raising the shades and turning on the front windshield fans generally clears them up in a little while.


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Old 05-05-2016, 04:16 PM   #3
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Cover the insides with something like RainX anti-fog. Single pane windows allow that condensation transfer. We always have this problem.
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Old 05-05-2016, 04:54 PM   #4
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Originally Posted by bitNine View Post
Cover the insides with something like RainX anti-fog. Single pane windows allow that condensation transfer. We always have this problem.
X2 RainX is DA BOMB! -worth your time to put it on all of your coach's windows!
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Old 05-06-2016, 02:32 PM   #5
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If the Rain-X prevents condensation on the interior windows then where does all that moisture go?
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Old 05-06-2016, 02:52 PM   #6
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Into your walls and everything this else that can absorb it..

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Old 05-06-2016, 03:29 PM   #7
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If the Rain-X prevents condensation on the interior windows then where does all that moisture go?
It doesn't "go" anywhere, nor does it prevent condensation. An anti-fog treatment simply alters the surface of the glass, making it hydrophilic (opposite of hydrophobic), meaning it acts like a sponge and loves water. A hydrophobic (literally a phobia of water) surface causes water to bead up, meaning a water droplet looks more spherical, making it easy for the eye to see the droplet due to the way it refracts light from its surroundings. Fog is made up of a large number of these tiny little droplets, and because of their shape, it makes seeing past them nearly impossible. Hydrophilic surfaces cause a droplet of water to flatten, more like a contact lens sitting on a flat surface. This means you can see through it, and it refracts light differently.

The water still condenses on your window, and therefore it will still be wet, but you can see through the droplets because of their shape.
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Old 05-06-2016, 04:50 PM   #8
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It doesn't "go" anywhere, nor does it prevent condensation. An anti-fog treatment simply alters the surface of the glass, making it hydrophilic (opposite of hydrophobic), meaning it acts like a sponge and loves water. A hydrophobic (literally a phobia of water) surface causes water to bead up, meaning a water droplet looks more spherical, making it easy for the eye to see the droplet due to the way it refracts light from its surroundings. Fog is made up of a large number of these tiny little droplets, and because of their shape, it makes seeing past them nearly impossible. Hydrophilic surfaces cause a droplet of water to flatten, more like a contact lens sitting on a flat surface. This means you can see through it, and it refracts light differently.

The water still condenses on your window, and therefore it will still be wet, but you can see through the droplets because of their shape.
Wow, great explanation. Thanks.
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Old 05-06-2016, 05:00 PM   #9
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If your windows are fogging up ( water condensation) then the same thing will happen on other cool surfaces throughout your RV. This can cause some minor water damage if serious enough. Your solution of leaving a vent open is a good option. You can try opening an un-powered vent and crack a window in the other end of the unit to get some cross ventilation. As long as you are inside and breathing, and it is cold outside you will have the possibility of condensation on cool surfaces.
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Old 05-06-2016, 06:02 PM   #10
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Look on the bright side. Using micro fiber chamois it's the best window cleaner going. Not to mention absorbing all the condensate that collects at the bottom of the window.


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