The CAP fuzzy logic is better than the one I use now---C.A.P. PPM3---it's better on the juice-----I run my exhaust only at night when the co2 is off. Saves on the juice and the co2 during the days gives them all the co2 and o2 they need---my lights are passive and my room rarely goes over 82 in summer---I have an port A/C set to 85 but it never kicks-on(mostly a safety measure if something goes wrong with my passive light fans.) I'm still using a 20 pound tank a week at 1500ppm's---my room is 1200 cubic feet---my room cost 150-200 a cycle dep on strain---I have a nat gas burner for winter-I only run juice in the summer.