How much air circulation do you have in the grow tent itself? If you don't have any I would suggest this as your next course of action. The addition of fans dropped my grow room temps about 3 to 4 degrees above ambient room temps during lights on and about the same lower during lights off. Which means about 75-76 degrees for highs and 68-69 for lows.

You really need to get the air moving around inside the tent. Your plants will love you for it.
ditdotter Reviewed by ditdotter on . 400W HPS w/4" Sunleaves Windtunnel Fan Just a heads up to everyone. I've looked all over this forum and had to piece together info from several posts. My setup is the following: Carbon Scrubber (18" long x 6" Diameter - Closed cap on one end and 6" to 4" reducer on the the other) That is directly connected to the inlet of the 4" Sunleaves Windtunnel fan. I then have a 4" elbow to a 4" to 6" increaser. Then 6" aluminum flexible ducting to the bulb end of the cooltube. After that it's just 6" flexible ducting out of the Rating: 5