In winter, our house is warm and while its not really that humid, it is less humid than outside. I keep some big ziploc bags (the Big Bags ones, some will hold camera + 600/4), and put the gear in them. Probably that's overkill. But if you can slow down the warmup, that takes care of it. The camera bag/backpack helps, but if you have an unheated basement, you can move them there from outside, then bring them upstairs a few hours later.