Many commercial and industrial buildings in Florida have roof top mounted HVAC systems. These systems include curb mounted HVAC units as well as smaller package units that are set on sleepers or other types of dunnage. Using sleepers (e.g. wood blocking or concrete pavers) to support these types of mechanical units can have a negative impact on the long-term performance of the surrounding roof system.
The roof system represents one of the largest surfaces of the building structure. In fact, if your building is a single story structure there is a good chance that the roof system is actually larger than all of the wall surfaces of the building put together. Addressing the energy efficiency of the commercial roofing system on your building may be part of your solution to controlling the energy costs for your building.