Mebee smart people don't melt in water, but some of us drop our hot projos in snow. I do it to some when I feel like it. Got the idea for quenching in snow, because it doesn't splash back, just go out and reload the bucket everyonce in a while. I really don't know if I am accomplishing much, as I also feel the working of the sides in the sizer likely removes any surface hardening that might have taken place. 'Twas a good idea at first, but have since discontinued it.
I heat my garage in the dead of winter. Besides being a wussy sitting there freezing my toes off, it's also hard to keep the top of the pot good and hot when the ambient temp is that cold. Just warm enough that I don't sweat, and thusly, don't drop my beer, ha.
We also have our BIG melt in the winter out at the farm shed. We accumulate about 3-400# of WW, get the big propane burner out, set it under a 16" steel pipe cap with legs (holds 200# after skimming clips) and it still gets toasty right around the pot. Holy cow, would that job be a hot one in the summer. We run 4 ingot moulds, and still dip them in water after pouring in the lead to keep them from overheating. Got a big ladle and it goes fast. We have an airhose to dry off the mould each time before repouring.
Better than sex, I tell ya