I want to install a 2-ton Mini-Split ductless system in my
garage/workshop. It's a 3-car garage with insulated walls, ceiling, and
doors, approximately 660 sq ft with 11-ft ceilings. It has been
recommended that I look for a unit with an SEER rating of 15 or better,
but I can't seem to locate one.

Any suggestions? I'm near Sacramento CA

Thanks!

--Steve