Two system heat maintenance in Atlanta. Arrived on site, changed filters and cleared barometric ports. Checked ignition systems, electrical connections, amp draw and capacitance. Found left side main floor system ( in crawl space) with inadequate amount of duct work putting a great deal of stress on system. Recommended installing more to help system to better move air throughout the space. Also recommend installing surge protectors for each system to protect electrical systems and Uv purifier to improve air quality inside house. Both systems are operating at this time