How do I size a mini split for my woodshop?

Morning! Hope you're settling in for that poop, cause I got a wall of text coming at you.

Well, the title basically says it all. There is a lot of seemingly conflicting information on this online, and I want to make sure that I get this right.

I am turning my two car garage into a woodshop that will be somewhere between hobbyist and small business. I'm getting ready to run wire for a sub panel to power all the tools and the AC. BUT... I don't know what size mini split I will need, and so I'm not sure what I will need to consider for the sub panel.

I have found a couple of calculators online which have given me very different sizes. I learned last year when we had a guy out to service the central AC, that sizing the unit is important for humidity control. Being a wood shop for fine furniture, it is very important to me that I keep the humidity level stable.

If this helps, my garage's info: Located in Houston, TX - very high humidity Brick veneer East wall shared with interior, 1 door to exterior, 1 door to interior. Wall is insulated. South wall exterior w/ 2-car overhead door, not insulated. Walls also not insulated. West and North wall exterior, nothing. Wall is not insulated. 8'6" ceiling, not insulated. Attic air is separated from the house's attic. Concrete slab-on-grade with epoxy floors Built 1978 Roof Gable runs East-West, so the roof takes Sun all day. It is also a dark brown shingle When the West Wall gets son, there is a good amount of shade from trees.

Other considerations: I take my lung health seriously, and so I plan to run my dust collector through a cyclone and then vent outside. I expect to be venting about 1000 CFM.

It seems very difficult to find good information on this subject, so I wouldn't be mad at you if you felt like answering any of these questions, either.

Should I insulate? With what and where? Any recommendations for brands? I can get LG units at cost plus 5 from work, but I don't know if LG makes a good unit or not. Did I miss any other important considerations?

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