The fan is a 12 volt fan with on/off switch and built in ac/dc converter. Pretty neat fans for the price and so quiet you normally don't hear them Corallife makes a larger version also 12 volt (I think 4")
I don't have or use coolers except in my cigar humidor. My tank is in basement that maintains pretty cool temps day and night. Yes I have linked to a few peltier cooling units, etc. but don't have much first-hand knowledge except as used in a cigar humidor. My humidor temp is set to 70 degreesF and the cooling unit does not run in winter (duh). In summer it generates so much humidity I need to use 3 tubs of "Damp Rid" to keep humidity below 70% (my target for cigars is 66%). I think the combo would be great for orchids except for one thing: my humidor is insulated - your orchidarium won't be. The cooling unit would run 24/7 whenever temps exceed the controller set point. Don't know if this will damage the unit or not. If cool temps are a must for your needs, I would have a special double-wall tank made (can use twin wall greenhouse glazing) just to house the cool growers, and don't worry about temps in the intermediate/warm orchidarium. Just a thought.
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Ross
http://orchids-ross.blogspot.com/
I don't do most Dendros or large, "floofy orchids". For me it's minis (like Angraecoides), Masdies, Paphs, and others that crept in somewhere along the line. See my orchid list for complete collection (usually not current.)
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