Hey guys

Got a 30x40 pole barn with metal sides that I've converted the back 20x30 part of it into a workshop. I've studded up and insulated the walls with R-19 and added sheetrock. I've now installed a drop ceiling grid with 12 led troffer lights. I'm to the point of wanting to insulate the ceiling and add the tiles . I'm trying to decide if I need to spend the extra money for R-38 here in the Nashville area or if I can get by with R-30 which is quite a bit cheaper.

I'll be heating and cooling the space with an 18k btu Pioneer minisplit heat pump.

Thanks!