Hi, We live in a cold winter area, with night temps dropping anywhere from -10 Celcius to -20 Celcius (about 15 to zero Farenheit, sometimes colder.) We have a well-insulated chicken house with a 1-foot square vent near the top center of one wall, and in the summer I leave the door open a bit, so there is no condensation. But now I have a heat lamp on for them at night, 150 watts, and if I shut the door tight, the vent can't keep up with the humidity, so in the morning there is condensation running down the door and the plastic over the 2 small windows. So, I was wondering if it would be better to add more ventilation, which will probably mean the temperature will drop below freezing in there. What's worse? Cold or condensation? Thanks so much for any comments, Linda PS I have mostly Rhode Island Reds, a couple of Silkies, 2 English game hens, 2 Guinea fowl, a bantam frizzle and a standard size Cochin, all between 4 to 10 months of age.