I agree, it's not just the room, it's the redundant heat sources, redundant temperature controls etc. I've only used a single incubator in the past and I worried about it every year. I set up a second incubator this year (hovabator) and ended up losing all of my burm eggs to a hugh temperature spike. But at least my main incubator (natures spirit) held steady and I didn't lose any balls. I'm getting to the point though that I'd going to have to either set up a closet incubator or build another stand alone.