Well, seeing as I have nothing but live rock I don't care this summer about the temp, my chiller is shut down, no lights on the new tank as all it has is water. (don't want to add anything till painting and new skimmer are done, well maybe the rock soon) but if I had to keep things cool a chiller would be the only way for this weather as evaporative cooling like Sam said is good for 5 or 6 degrees, but on my tank before the chiller I could easily get up to 100+ degrees so 5 or 6 didn't cut it as my tank used to get up to low 90's on hot days like this.
Central air is good for a little bit of cooling and if you don't have MH it will probably be enough, but remember air is a very pour source of cooling power as it heat value is about 1/4 that of water so you would need a lot of cool air flow to remove the heat caused by MH light and I don't know of any central ACs that are affordable that could keep up to the demands of a large tank.
Steve
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