Tank Overheating, Help!

I have used the clip on for over 10 years now and always have a couple around. i have one over my sump blowing across the length and I have to be careful of it kicks the heater on. I sold my 1/4HP chiller the beginning of last summer since it had not run in two years due to a clip on fan over the sump and two 120mm computer fans in the canopy. Thats in Phoenix with a 100G with 2x250w MH and 2x140w VHO in a completely enclosed canopy and the house has a digital setback thermostat so its warm while we are at work.

Dorm fridges are not designed for continous duty so fail quickly. Plastic tubing is also horrible at exchanging heat and cold so they are extremely inefficient at best. the cost to operate one is higher than the benefit you receive from it. Study the laws of thermodynamics and you will see for yourself.