Taking a class and getting certified on a particular system is a good start. Those types of classes will give you the basics of that system. But there's no substitute for actually installing one from the ground up. Troubleshooting is the best training of all. I believe that's where you learn the most, when you're sweating bullets on a job site from somethings gone terribly wrong. As odd as that sounds, you will come away from it having learned a lot.

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