Before you invest in AC, different lights might be cheaper. The thing I have liked about the Quantum Boards is that there is no internal electronics-cooling fan that blows heat around (like blurples), and they don't create enough heat to need them like CMH, HPS etc. They are cheaper on the electric but get better light penetration (fatter buds - even lower on the plant) - and all you really need is exhaust. the heat naturally rises.
I should add that I have a 300w, and a 600/1200w blurple in a drawer. I might bust them out if I have a light go down but that would only be for as long as it took to get a replacement QB