I think I have a good idea
I've read about and seen on this site many clever ideas for proof boxes. Now that it's cold out (and in my house) I decided to try my idea. Have any of you heard of or seen a plastic microwaveable disc used to keep pets warm for up to 12 hours? It's a flat, washable, pink plastic disc about 1" thick filled with some kind of gel and you heat it for about 6-7 min. in the microwave. Since I no longer raise puppies, I've been using mine between the sheets at the foot of the bed in winter. Aaaaah. Well today I put a folded wet-with-hot-water towel in the bottom of a large clear plastic tote and placed the super warm disc on top of the towel and closed the lid, which did not fit tightly. I had taped an old thermometer inside facing out so I could see it easily. My heatable disc is at least 10 yrs. old and doesn't get quite as hot as it use to but it did warm that tote up to almost 75 degrees and kept it there for, well, at this point, over 5 hours. Everytime I've opened it it's nice and warm and humid in there. My thought is to put a rack in there to set loaf pans of dough on, etc. An air tight cooler would work even better. I like that the warmer is plastic, washable and dual purpose...raising bread by day, warming feet by night! Will be trying it out w/ dough this week.