I think I'd be way more concerned with increasing ventilation than rigging up heat.@aart
So I picked up a nifty little sensor to track my temp and humidity - I hung it about 18 inches from the ceiling, midway, (so just shy of probably 5.5 feet there ceiling to floor). And inside temps held pretty much 2-3 degrees a higher than "outside" temps, but the humidity was high! It started around 70% by morning it was above 90%!
This was with only 1 window open and almost no wind last night. Tonight it's supposed to be close to 25 degrees with significant wind.
I did fashion a heat lamp in the Coop that I can remotely turn on/off, haven't tested it yet. I've also yet to make any additional "vent holes."
Thoughts?
What was the temp?
What was the humidity outside?