Exactly. All you need is a space or container colder than the one you're trying to cool, and a conductive tube or duct to exchange the heat. Works nicely with orchids since we're often growing them in conditions only slightly warmer than outdoors or a cool basement.
Just a heads up for you guys who are hesitating about trying Disas. Now the flowering season has started!
One of my plants are very early a D. Kewensis "May"