Metal Halide and no Chiller?

[Quinster]

I have 4 X 250W MH and 4 X 54W T5 inside of a canopy on my 180G.

I have a controller to turn on fans at a certain temp (79.5°), then to start shutting off lighting if the temps get too high (82.5° for 2 X MH, 83° for 2 X MH and 85° for the T5's). Rarely do I see it turning off the lights, tank usually hits a high of 82°.

I do have central air in the summer as well to help.