I think any significant ASIC farm is using continuous cooling year found. A guy at the plant where I work has dedicated a room to bit mining. It never needs heating even when temps got to freezing.
Yes, but it will mean fewer degree-days of cooling.
And, you're forgetting adjacent (or, better, overhead) locations. I'm in a building where heating comes from the room next door...I often don't need to have the heat on at all. In the summer, though, we have to have the A/C on. So the winter months mean there's less electricity use.