Brewing outside this time of of year can be tough, especially when mashing in a metal pot that conducts heat easily. What are some effective ways to prevent heat loss when brewing inside isn't an option?

Hi all, I'm from Ohio, particularly the Columbus area, and have Ben brewing for almost 6 moths now. I have 5 batches under my belt in that time, all partial boil extract. When my girlfriend got me a 16 gallon pot and propane burner I decided that full boil BIAB was the way to go. I heard about this ...