Gary, here is mine (I don't know if it helps, though):
(oops, I noticed the color balance is quite a bit off).
If you need quite a bit of cooling (I think your place is pretty warm/hot), did you consider a modded refrigerator? If you use something like HygroTherm, you can control the night and day temp/humidity. You can use household ultrasonic humidifier connected to HygroTherm. LED is probably better bet because you can mount it inside. The efficiency of LED increases with lower temp (unlike fluorescent light).
I'm guessing that a modern fridge is more energy efficient than cooling with aquarium water cooler + heat exchanger.
If you want to make a custom enclosure, some people attach a portable AC unit (
Karma has a nice setup).
If you have cold well water, it might be a good source of cooling, but it could be quite a bit tricky.
To make a custom enclosure, plywood may be a cheap/easy way. There are quite a few plywood aquarium web sites (they use epoxy to make it waterproof). But elastomeric paint used for roofing seems to work pretty well (easier and cheaper). I have a couple water-catch trays made with plywood+ elastomeric paint, and they are holding up pretty well. Or maybe something like
Ray's enclosure made from rigid foam insulation. Insulation will definitely help to lower running cost.
Knowing that you jump in deeply (e.g. flasking lab), I'll not be surprised that
Percival Environmental Chamber is installed in your place next week!
oke: