Condensation and Roof Construction Concerns

pianotuna wrote:
Hi klawklr,

Cracking a window. The idea is that hot moist air rises drawing in cool air. As the cool air warms it drops the relative humidity inside the RV. I would relocate the electric heater to where the air is coming in. You can experiment with the size of the openings needed. Make a crude draft gauge from a piece of Kleenex. Use the roof vent to control the amount of air flow while measuring the draft at the window.

I am full timing in a class C. Right now the temperature is -7 C (19 f) and the low is forecast to be -10 C (14 f)

I've used my RV at -37 C (-34 f) and have boondocked for 5 days where the high was -27 C (-16.6f)

klawklr650 wrote:

pianotuna wrote:
Hi,

Crack a roof vent and open the window (a bit) that is farthest from it. Place one of the electric heaters near the window.

Condensation is about keeping the surfaces above the dew point temperature. I have been known to run a humidifier inside my class C in winter time, but I live in the North American equivalent of Siberia.

Thanks Don, I have opened the bathroom vent about 1.5 inches. Are you suggesting cracking a window farthest from that vent? Or cracking a roof vent, say, in the living area and cracking a window in the bedroom which would be farthest from the roof vent? I would suppose then I should relocate an elec heater to the bedroom where the window is cracked? Are you using your class C in winter time?

Pianotuna, thanks for the picture you've drawn for me. I can now visualize what you and others have discussed. I'll start experimenting with vent and window adjustments. I have to say, the temps you are in are no where near where we are. Our lowest this season has been 26. I cannot even imagine the temps you have been in with the level of insulation this unit is constructed with.