We have one gym that is 14,900 sq. ft. We have 24 ton on that one. We are opening a new 11,000 sq. ft. location and installing two RTU's for a total of 15 ton. The new location is a newer (well insulated) building that sits between two other units (less exterior walls).
AC for a warehouse is a major expense. It can run $25K to well over $100K.