temps got a little crazy a couple days(up to 90) but was able to keep them below 85. Realized this week I've been running an undersized exhaust fan(4" 165CFM) when I should've been running a 6". With my size room, ducting, and a carbon filter I need a minimum 260CFM. The 6" is rated at 400CFM which is more than enough. Can't believe I'm just now realizing this. Should bring temps down significantly