Installing a mini split yourself can save money, but it takes careful planning....
https://wiki-coast.win/index.php/Mini_Split_for_a_Workshop_600_sq_ft:_Is_18,000_BTU_Enough%3F
Installing a mini split yourself can save money, but it takes careful planning. In this article, I walk you through drilling the right 3-3.5 inch hole through your wall without damaging wiring or pipes