Condensation Problem on front window.
I pulled the curtain back covering the front windshield this morning only to find 1/4 of water along the bottom and condensation build up about 6 inches up the window. I had just finished installing R...
Forum Discussion
Fleetwood Couple wrote:
Update, tried the next night with the overhead vent cracked...ice on the inside of the window was even worse and the heater kicked on even more. Also my weather station said the inside humidity was 25% which is lower than outside so how will a dehumidifier help? Seems most folks are using the pillows that cover the vents so how are they ventilating? Cracking a window?
Keep in mind that the humidity is based on the temperature. The lower the temperature with a fixed amount of water vapor the higher the humidity. Most people that have humidity problems are using catalytic propane heaters or cooking inside with propane. Doing this dumps massive amounts of water vapor into the coach. The issue is as soon as that water vapor hits the front windshield which is single pane it will condense out. If you have low humidity inside the coach by using a mechanical dehumidifier you can mitigate the problem by using the front fans or a small fan blowing on the front windshield which should reduce the likelihood of water collecting. A good dehumidifier can drop the humidity quite a lot. You won't eliminate the condensation on the front window the idea is to keep it from collecting on the front dash area. The reason eliminating the condensation on the front window is nearly impossible is because it is single pane and you would need to drop the humidity on the inside of the coach to less than the dew point of the temperature outside. That is very difficult to do because in the winter it is 30 - 50 F warmer inside vs. outside. This means 25% - 35% RH inside at 75F would be past the due point at 30 F. Having a fan on the front window can attempt to keep the window warmer to keep the water from staying on it. Opening a window or vent only works if you are producing a lot of water vapor such as cooking using propane or showering. In that case open the vent and then close it. The only other thing you really can do is to add a cover on the outside of the window to attempt to keep the window warmer.
