LateBirdFarms
Crowing
What breeds do you have? Anything with monster combs and wattles? My girls tend to keep the coop anywhere from 10-15 degrees warmer than the outside temps if the winds aren't wicked. The water was the aspect of winter i struggled with the longest, and I think you're entirely right on the trial and error front, there's dozens of fantastic ideas and diy plans out there but it's going to be a matter of what works best for you and your setup.