Remember, with a temp controller, the AC unit won't be running continuously, only once in a while. Especially if you've insulated your fermentation chamber well.
Best Regards, James
My beer blog: http://brewdujour.blogspot.com
My website: http://www.carbon111.com
Fermenting: Carbon's Grizzly Bear, Young's Special London Ale (clone)
Bottled/Conditioning:Siberian Raven Winter Ale, Cherry Tree Porter, Victoria's Dirty Secret
Drinking: Montgomery Scottish Ale, Thames American Bitter, Crow's Beak Old Ale, Bastet Brown, Carbon's Cascade Ale, Red Silo Honey IPA