Like many things these days (eg. appliances), there are many more brands out there than there are actual manufacturers. Mini-Splits is one of these things. The good news is that if I do have to wait a few days for a repair part, it is my garage/shop, not my home, so I can either tough it out or wait it out
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The one concern that I do have with any Mini-Split in a garage shop is keeping it clean. They don't have filters like your typical home units do that are disposable. They have these mesh sections that you pull down and wash off periodically. I feel like I will really need to stay on top of this or it could be trouble. The return air on all of these units is the top, which is exactly where all the dust that gets stirred up in a shop is going to land. I plan on monitoring mine closely and if I need to I'll build a housing over the top that will allow for using a sizable bank of disposable filters. There are many YouTube videos of people doing this.
For what it is worth (not much, LOL) I recently retired from a 35 year career in HVAC, Building Controls/Automation, etc. Granted, my experience is not as a refrigeration technician (engineer, project manager, then leadership) and not residential (Commercial, Industrial, Data Centers, Military, etc...) but I am confident that a Mini-Split, of some sort, is the right solution for most small shops.