I use glass carboys bio-reactors, and also have a couple stainless steel cone bottom bio-reactors. The first, not so fancy; temperature control is accomplished by moving them to a room that has something approximating the apppropriate temp. The second has a tap near the bottom, and a hole for an airlock on top. I do have a couple heat belts, if I needed to raise temp, as they came cheap from a kombucha operation that was shutting down. Hmm, for that matter I do have that instipot for making natto or yogurt, it's a bioreactor too, now. Come to think of it, so is this silly sphere in space we're conversing upon. Cheers!