heat is a deceptive bitch. I just had to replace a 6000btu w/a 15000btu and it's fall. i added 1k to the room and the temp went up 8-10 degrees. i thought the 6k could do it, but i was wrong. my 4way hybreds are picky, picky, and started yellowing in 2 cycles of light. yep that fast. no central ac is making this fun and challenging, but hey, what else would i be doing? 9to5...lol

gl hn and heat will cause those spots too. heat + not much air movment?