two thowys are going to be super hot especially with only one duct fan. that fan is just to keep the air moving thru the lights, its not cold air unless youre pulling from outside lol. Everywhere ive read says ideal blooming temps are 70-77degreesF. 86 and higher and 55 and lower will stop/ stunt growth. you should stay within a 15 degree window or you could stress your babies for example if youre at 75 degrees lights on, then you shouldnt go any lower than 60 when theyre sleeping. just an example, some people keep their rooms at 58-65degrees to make that chlorophyll start turning, its all preferance, thats the beauty of it all:)