A DIY mini split can heat and cool a garage, but check size, leaks, cold...

https://spencersexcellentcolumn.scriblorax.com/posts/how-do-i-know-if-my-garage-insulation-is-good-enough-before-buying-a-mini-split

A DIY mini split can heat and cool a garage, but check size, leaks, cold rating, line path, and panel first. A 15A breaker may not fit. This guide helps you spot key specs, plan the job, and know when to stop and call a pro before you buy or drill.