I was given a big old chest freezer. Don't know the deminsions, but it will easily hold 6 buckets, and my stir plate. I use a small space heater, and tape the temp probe to one of the carboys. The one problem is I like to brew different beers, and many call for different ferm temperatures. If they are too far off from each other, I just average them. But, mostly stick to 67 degrees for 7 days, then I raise it to 70 for two days, and keg it up. It works well for me.