Condensation on upper inside walls ral cold morn

luberhill wrote:
So if I winterize and put in my pole barn should I leave window and vents open ?

Maybe, but there's no obvious source of moisture then.

NO, if you run a dehumidifier close all windows and vents then open everything inside.
Jay D.

So if I winterize and put in my pole barn should I leave window and vents open ?

ktmrfs wrote:

rhagfo wrote:
Get a small dehumidifier, not dry-z-air, and electric unit. We have zero condensation in cold damp locations, spent six months at the Oregon Coast.

exactly. you've got several things working against you.
1) same amount of perspiration etc. as in a house but less air volume
2) anytime you run the stove for every gallon of propane burned you are putting almost 1 gallon of water in the air
3) even with fans on you get added moisture when showering.
4) less insulation than a sticks and bricks.

All this means a higher indoor humidity than sticks and bricks, combined with lower insulation, much easier to hit the dew point on any cool surface. Windows, walls, ceiling etc.

As long as you have 120V available run a small compressor driven dehumidifier 24/7. When at the oregon coast we will pull 5+ gallons of water out of the air in the first 12 hours, then it drops down. But if we come in with damp clothes or humidity goes up, the amount the dehumidifier pulls out goes up. And still open vents when showering etc.

AND. it keeps the windows from fogging up in the morning as well.

Best $100 you will spend

this ^^^ is the best cure for your problem. check Amazon for a Ivation I have the 2200 cu ft. model priced at 59.99 its small and quiet and works great.
Jay D.

Get a small dehumidifier.

rhagfo wrote:
Get a small dehumidifier, not dry-z-air, and electric unit. We have zero condensation in cold damp locations, spent six months at the Oregon Coast.

exactly. you've got several things working against you.
1) same amount of perspiration etc. as in a house but less air volume
2) anytime you run the stove for every gallon of propane burned you are putting almost 1 gallon of water in the air
3) even with fans on you get added moisture when showering.
4) less insulation than a sticks and bricks.

All this means a higher indoor humidity than sticks and bricks, combined with lower insulation, much easier to hit the dew point on any cool surface. Windows, walls, ceiling etc.

As long as you have 120V available run a small compressor driven dehumidifier 24/7. When at the oregon coast we will pull 5+ gallons of water out of the air in the first 12 hours, then it drops down. But if we come in with damp clothes or humidity goes up, the amount the dehumidifier pulls out goes up. And still open vents when showering etc.

AND. it keeps the windows from fogging up in the morning as well.

Best $100 you will spend

If you're running on electricity, just get a dehumidifier. However, a little condensation overnight is no big deal as long as you are rid of it soon after waking.

luberhill wrote:
What do you mean the “fan temp” ??

I have adjustable exhaust fans (thermostat and opening) in the bathroom and living room. I use them to keep the air moving. I set them to automatic when not using the RV. When on a trip I run them manually, moving the moisture laden air out during the day. At night, I leave them cracked open, but leave the fan off, letting the humidity rise somewhat overnight so as not to feel "drafty". Then during the day, open them wide and get fresh air into the RV. For me, the AC has nothing to do with this, and I do not use it at all when the furnace is on. There are many ways to this end, but the upshot is, you must get fresh air into the RV and keep the humidity as low as possible.

We always crack a roof vent - yeah we lose some heat but two adults and dogs create alot of moisture. We also run an electric heater which has a good fan ... keeps condensation to a minimum.

What do you mean the “fan temp” ??
I have a small elect heater the po left...I turned the heat down last night to 63 maybe I should leave it at 70 ??
I know I’m ocd and the damp I feel is about an inch wide path on the very top of the wall where it meets the ceiling.
Just in the back bedroom and in the shower.
Again it rained hard all night last night but I didn’t have a window or vent open but all the heavy shades were closed
I set the fan on the Dometic stat to low so the ac fan comes on when the furnace does but it doesn’t shut off when the furnace does
It also makes it drafty cold feeling