Mine is dropping hair like crazy as well. We had a day of good temps and sunshine last week so I took the opportunity to give him a full bath and used a soft curry on him. The hair in the drain when I cleaned it out for the next person was enough to make a small pony. It's been nice the past couple of days not to get brushes full of hair at two strokes :)
If it seems you are going to get a plummeting temp then think about blanketing. My barn usually blankets if the temps will drop below 42 right now and I have a medium weight blanket on mine generally, but we also had two nights in the past couple of weeks that went down to the teens where I swapped out to his heavweight.
I look at it as what they are used to. If they are out of the wind and generally used to the mid to high 30s to 40s, I won't necessarily blanket. When I look at a thin coat now, or rather thinner as he still has some thick areas, and the temps take a sharp drop, I'll blanket accordingly.