Got a call from owner,AC isn't keeping up. After the load cal. is done,what about the tanning beds? 8 of them in a 900 square foot area. You could grow tropical plants in the place. 3 ton unit in there now,but if I have to go bigger supply will have to be changed over to a bigger size. All in a very small attic space,of course nothing is insulated and duct is almost touching the roof. I'm going to need back care if I do this job.