Thats one less worry...i think its really due to the hot weather at the moment. I started my first grow in the middle of summer...winter should be a lot easier!i am sure you will as 80-90 is not too hot but you should aim for 75* (day temp) and 65* (night temp) for optimum results.
(good luck).
CHRIS.
Got more ducting yesterday, another large server fan and some block connections to wire them up. Will get that done today and see how it goes!