I've just experienced same heat probs and I was running 270cfm exhaust with 80cfm at the intake for a 640cfm room. It was not enough, but I was running 3 600w lights. Solution was more construction to set up an in-line airflow through the lights. If this is not an option, I would upgrade my exhaust and place the 100cfm at the intake. If this is not enough just run the intake fan constantly, while the exhaust run intermittently as necessary. And as mentioned earlier, Co2 helps. Play it safe and make changes before plants are in.
snow owl Reviewed by snow owl on . check my set up so hey i just set up my grow room. i have all the equipment worked out that not what i have questions about. i have a 400w light. just catch me it iam wrong. my room temp is 90 F or over but i got a 100 cfm exhaust fan. is that good for a 400 cu. feet room? and will that cool it down? if it dosent i will buy a swamp cooler. but the room temp. should be bet ween 70-80 F right? i have me seeds germanating, in the humidity dome it is about 84 F. i am keeping the rockwool wet but not soked. i Rating: 5