If you are an avid DIYer, then I'm sure you take great pride in your workshop. You might even think that your workshop is the best on the block. Do you have the latest and greatest tools? Do you have a top-of-the-line air filtration system and workbench? Are you able to control the temperature of your compressed air? No? Then consider building your own vortex tube.
According to Avery Thompson for Popular Mechanics: "So you've hooked up a source of compressed air in your shop. It's super useful for blasting away dust and stuff, but wouldn't it also be great if you could control the temperature? If you had easy access to cold compressed air, for example, you could cool off your tools when they get too hot.
What you need is a vortex tube. A vortex tube is a piece of metal that splits a stream of compressed air into two streams: one hot and one cold. Typical vortex tubes can cost upwards of a hundred dollars, so here's a way you can make your own, courtesy of YouTuber This Old Tony."