I read some of the discussions on heating the coop vs not heating. It seems the argument to not heat is that the day/night temp differences will stress the hens and that they are better off at a more constant temp? Please correct me if I have misinterpreted. In my location I question this logic because of our climate. Winter is our dry season, typically we have little snow and it doesn't last long. Humidity often ranges from the high teens down to unmeasurable, I have seen it read zero humidity. This causes us to have huge temperature swings most days, we had about a 45 degree day to night swing yesterday, and 55 degree changes are not unknown. The coop has been running 20 to 25 degrees warmer than outside with one window still cracked a bit. Certainly no problems with cold yet. However, when the cold really comes we can have single digits at night and 60's in the day. We are thinking about moving an unused solar collector from the greenhouse to the side of the coop, it will warm water for a 55 gallon drum that we can stash under one row of nest boxes inside the coop. Has anyone else tried this? The coop is 8X10 and has 19 hens now (I want more in spring). It is well insulated with double paned glass windows. I realize the hens are in no real danger from the cold, but they are pets and I try to treat all my pets as well as I am able to. The two real questions I am presenting are: about the impact of daily temperature swings on hens, and if there is anyone using solar heating similar to what I discribe.