I've settled on a mini split. After consideration, my main concern with running natural gas to the garage is that it would require a licensed plumber to do if I want to go the permit route- which I do, just to stay above board.
The new Blueridge XS6 model, which I believe is a rebadged Gree Sapphire, is comparable to top of the line Mitsubishi and Fujitsu models. The good thing about Blueridge is that they will warranty DIY work without any certs or licenses, and have great technical support.
ashp.neep.org
www.alpinehomeair.com
The downside is that it does not come with as a DIY kit, the upside is that it's only $100 to rent all the tools necessary to do the evac. I already have a nitrogen tank and regulator for cold brew coffee, so I'll be able to go the extra mile with the triple evac.
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Regarding wood shop dust, I already planned to build out a dust collection hose system to make cleanup easier, but that won't capture airborne particles. I'm going to install something like this to run while I'm out there working and be sure to be diligent about keeping the mini split's air filter clean.