mine too. 79-82 is where i like to keep my reef tanks. 80 for me is perfect. how big is your tank? does it have a canopy? what kind of lights? i bought 4 computer variable cooler fans with a temp probe for $50 including the transformers and pugs. for my canopy, then got a 10000 btu air conditioner window mount, for i think it was $160 at sears. keeps the tank nice and cool. as a bounus keeps me nice and cool too. could have use a 5000BTU one but the 10000BTU does not have to work hard to keep it nice.