well, lets just say, when our rabbits compete in the lower 48, fur class is a give-me
I know of lots, if not the outside, I know that they loose some, but you give them a box with straw to hide in, and a sheet over the cages you usually are good
water is the major issue (it was -033 at the show this morning, BUT Wednesday and Thursday were +40*) talk about a bit of a swing, it's -18 right now (I'm defrosting my face right now)
You give just enough water for the day
Me, I'm killing myself with the electric bill, most of the time I don't heat, but once you go below about 5, the rabbit mass isn't enough to keep my insulated barn (I have a leaky roof on purpose this year trying to keep the ammonia down) but a 750 watt heater ceramic heater and a box fan will keep it above freezing about 35-40ish
That said, mine don't have near the fur of some of my competitors, but I have better condition.