Originally Posted by
Dapaki
I would seriously consider a ductless mini split, 2 ton system for your shop. You can find them from all the box stores (online) as well as Amazon for about $1k.
a 18,000 BTU window AC unit will run 1/2 of that but they also dont normally even have a SEER rating bur expect a SEER of 9-11 for window units and up to 19 for a ductless mini split.
This is really how efficient the unit is and how many BTU you get per kW.h. If you AC for a few hours a day, the window unit may be your best choice but if its left on 24/7, you will make up the difference money wise very quickly.