How to lower temps inside a terrarium?

[swords]

I thought putting a circulation fan in my terrarium would bring the temps down but actually it raised the temps about 5 degrees from 81-86*F(!!!).

Is there a secret to cooling a terrarium lit with Power Compacts w/o hooking the actual chamber up to a window AC and ultrasonic humidifier like I used to for my alpine Nepenthes. I don't need highland temps but I'd like to bring it down from 80 to 75*F max daytime and maybe 65*F at night.

I'd be interested in hearing what you folks do to maintain good temps. I'd like to know your terrarium rooms ambient temp and the temp in the chamber if possible.