Thanks for your reply. I have to keep the brew in the garage since the wife doesn’t want the house smelling like a brewery.
I was planning to use bread yeast (dry active) for the mash since I’ve heard it provides a nice flavor. Since my initial post, I bought a brew belt for $20 online and tested it with my 6.5 gallon fermenting bucket filled only with water. It worked well, and kept the liquid at a stable 72-74 degree range for an entire week (ambient garage temp ranged between 58-65). Therefore, the brew belt should work well with fermenting my mash.