Ventilation Help! **pictures included**

[Nwchickma]

From what I can tell, the roof slopes down toward the run.  You said there was an opening from the run to the coop, right? Is the opening at the top of the wall that faces the run or bottom?  What direction is opposite the run?  Does that side face into your prevailing winter wind?

It does slope toward the run. I have a PVC roofing material over both. The opening that is into the run is the top 4inches, and under that is the pop door that stays open. The front of my coop is facing NW I think. That would make the back of the run SE. I'm not sure about the wind question, we just moved into this house in March, which way does wind typically go?

 

[MeepBeep]

which way does wind typically go?

Northern IL wind is generally from the South West, but arctic fronts can make it come from the North West also being a Chicago burb (me too) on the East side of the state we get the weather fronts bouncing off the Lake or stalling because of the Lake and then all best are off and the wind can swirl in any direction...

 

[Amberjem]

leaving top of run open sounds good think that may be causing alot of your humidity issues

 

[NotAFarm]

My thoughts:
If the run is completely enclosed with plastic, the warm moist air is traveling up (rising) along the roof and entering the coop. If it doesn't have a way to continue rising along the roof and a place to exit, it will accumulate in the coop itself. Openings at the top of the run, mentioned by others, will allow the warm air to escape before entering the coop. I would close off the opening between the coop and the run that is high and leave the lower door opening as the "air intake" for the coop. Put a vent on the high wall of the coop, just below the roof, across from the door from the run (I'm assuming the roost for the chickens is on the opposite end from the door to the run). If you find that rain/snow are entering the coop through the vent, make a shield or overhang to prevent it.

 

[Nwchickma]

Thanks all! Snow forecasted for this week so better get going! Darn Chicago weather! Why do I live here?!