Wow, lots of interest. Cool.
My HVAC guy said to get a one ton unit. I bought a unit to cool only. Don't need a heater here in AZ. But you can buy a unit that heats and cools.
One part of the unit mounts high on the interior wall and the other part mounts outside on a pad in the ground. I'll take some photos in the daylight.
Since it has been installed, we've had record cool temps here. However, it runs very quiet and I can feel it cooling the garage. There are louvers on the interior wall unit that move up and down to rotate the direction of the cool air.
My doors are insulated, but my two exterior garage walls are not. Therefore, it will never get real cool in there. My goal was to cool the garage into the 80's. I can work comfortably in those temps.
As soon as it heats up here, I'll be able to really test it.