Danny, if spending the money anyway, you might want to go with a homemade chiller. You can use a "dorm room" refrigerator. Basically, you drill a hole in the refrig. and run tubing through, coiling a bunch inside. The tubing runs back out via a second drilled hole, and then back into the tank. You just place a small pump in the tank to pump water into the refrig. Regulate so only a small amount of water gets through. The water that runs back into the tank will be quite cold and will reduce the water temp. considerably. Hence, you would lower the temp. of the tank. Obviously, this would only work for aquatic newts.
All that being said, I wouldn't want to start off with the expense or extra space involved with a homemade chiller, though I might do something like that later.
Jon, we have central heat/air, and no window units. Therefore, there is no good way to put near an air conditioner.
Thanks for the heads-up on the FAQ, Jennifer. I'll check it out.