I have done this for years...I am trying to help. Just as you think you are...?
I run heat only enough to keep my water from freezing. My window is never steamed or frosted over. I use sand in my coop! My birds lay all winter. If OP is interested in my method they will ask. Other than that, it's a mute point.
Cheers!
You asked why everyone asks about ventilation first, I answered. We are all just sharing our methods and experiences here. No need to get defensive - no one said you were wrong...