It sounds like you need a Crestron system.
The thing about getting into professional automation/control systems is that you’ll need to pick brand, apply to be a dealer, and go through training. If you have no experience with this, getting a Crestron dealership may be tough.
With any of these companies, you’ll have to meet minimum sales goals and likely have to build a showroom.
My advice is to find a reputable dealer you can work with on projects like this. I do some basic automation/control systems, primarily Legrand for lighting controls and Nuvo for audio. For large projects though I bring in a Control4 dealer if that’s what is right for the customer. The Legrand stuff I sell and install integrates with Control4 and other 3rd party systems. I’ll do all the cabling and terminations, install the devices, and bring in the dealer for setup and support.
You really need to have a firm grasp of this stuff before you start selling it to be able to support your customer.
If you can get a few projects under your belt working with a dealer, that will help you to learn what options are available and how to design and install a system.
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