Depends on a lot of factors. One thing to keep in mind is that if you are exhausting the air into the same room where the intake is, you can use all the fans you want and still not get significant temp drops. But a cooltube is definitely worth it from my experience :twocents:
bigtopsfinn Reviewed by bigtopsfinn on . How much to expect from a Pyrex cooltube? I have a closet that is approximately 3 x 3 where I am running a 250 hps. It is hot as hell in there--approaching 90 some days despite all the ventilation I can muster up as well as leaving the door open when I can. The plants have not suffered much because I can usually leave the door open with a fan blowing on them, but this is obviously not discreet and I am wasting lisght with the door open. I want to make a Pyrex Bake-A-Round cooltube to concentrate the heat through my exhaust Rating: 5