I set up the lead pot and cast a mess of the new heads the other day when it was chilly in the room but just the heat shed by the hot pot had that room toasty in about twenty minutes so the insulation must be adequate.
I've been worried about the cold from the floor later on and will like hit Menards and grab a cheap piece of rubber-backed candy stripe junk for the winter. I am planning to put a full 5/8" thick rubber floor mat down next year. The rubber insulates like crazy and makes for a super nice work surface....very easy on feet and legs, plus its an excellent non-conductor if using an electric drill of something and the floor is sweat like they will in the spring.
Believe it or not, and I hate to even admit this,....I locked myself out of that room. The keys for the lockset were sitting on the work bench. I had to take the window apart to reach in with a wire to snare the keys, then re-assemble the window. That won't be happening again....forgot to put a key on my ring when I got the lockset in the door and had been testing for fit.