Why it matters to you
In mapped Charleston County flood zones, replacement HVAC systems must be elevated, and a substantial improvement requires the system at or above base flood elevation plus freeboard — so height is a code requirement, not a preference.
Practical guidance
Look up your zone on the FEMA Flood Map Service Center before planning equipment, and treat your next replacement as the moment to correct elevation. Even outside mapped zones, a yard that has held standing water is worth elevating for.
