Read link in my siggy. Yes. You may need BOTH an exhaust and an a/c depending on where you live and if you have a nice cool place to intake air from.

When you buy your LIGHT, ask the guy at the grow shop to recommend the correct size BLOWER to exhaust it. An air-cooled hood is worth its weight in dankies. The light, hood, and exhaust should be considered a single unit- a lot of people struggle with this at first and suffer high temps and the associated ills as a result.

Read Rhizome's sticky about growroom setup.