i used to run mine at 84 without problem. then our air conditioner broke. it took me a day to get it fixed and in that time the temp rose to around 88-90 i lost a colt, star polips, leather and part of my yellow colony. computer fans in my hood fixed the problem nicely, i only needed two of them to drop the temp to a consistant 79. if you live in austin you can get them at the goodwill computer store for a couple of bucks per fan, its well worth it.