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Originally Posted by StirCrazy
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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I have a heat pump on my house. It costs about a dollar a day to run. I keep my 150 gallon tank upstairs and my tank temps vary between 76 and 78. I have a pretty good exhaust fan which creates negative air pressure to draw the cool 73 degree air into the lighting area. I have two fans blowing over the tank. Water overheating problems are not an issue for me and it's strictly due to the ambient temperature of the house. Bill