Once again I agree wholeheartedly with iwiw. SHE'S usually pretty spot on with HER advice. Ventilation is absolutely the key - not a draft and not located in a spot where it ruffles their feathers, but enough to allow the warmer, moist air out. To do that effectively you need air flow - not wind, but air flow. That means exit points for that warm, moist air above their heads so the cold, moist air doesn't settle directly on them.
I noticed you said that you turn the litter over twice per day. Is there a reason you do that, maybe an ammonia odor? If there is an odor, that's another sign that your coop is too airtight and is holding damp air instead of letting it escape. You shouldn't have to turn it over that often. Part of the reason for the deep pine shavings is to absorb moisture from the feces, drying it out where it lands, rather than letting that moisture escape into the air. All of us who use deep litter turn it over on occasion, or toss some scratch in to let the chickens do the work for us, but we don't feel we need to do it twice a day. If your reason for turning it over so often is just your personal choice, that's fine, but if it's because you are detecting an even slight ammonia or "chicken house" smell, then your air circulation is definitely inadequate.
Try iwiw's suggestion about the plastic on the window, so there is air flow but not a direct breeze on them. Or, when the weather warms up a bit, drill some ventilation holes up near the top and cover them with hardware cloth. I have three windows, one on each of three sides so I can have the downwind ones open a crack at all times and close the one where the wind is coming from. I also have open areas between the rafters and the walls, and a gable vent on the east side, up high. I usually keep the pop door to their run open - their run is warmer than the coop simply because it's wrapped in clear plastic, ala greenhouse style. Our temps have been below zero for a week now - getting as low as -16 - and my chickens are doing just fine. Good luck! I hope you can resolve your condensation problem.
