I am 95 percent done insulating my 30 by 48 pole barn. 11ft to the bottom of the trusses and at the peak it is about 16ft. The Roof and sides are insulated with mostly R-18 rigid foam type insulation and the entire thing is wrapped in double bubble radiant barrier. Comfort in the building is considerably improved. Electrical will be done in about a week and then OSB on the walls. In the workshop space(about 850 sqft) I will eventually add hvac, probably a Mitsubishi Mr Slim. I am considering adding a drop ceiling, thinking it will greatly aid in heating and cooling but having the open trusses is pretty nice. What do you guys think, drop ceiling or open?