Heating maintenance in Dunwoody. Tested operation of 1 furnace. Discovered furnace under firing and needs to be calibrated. All other components tested within normal manufacturing spec. Discovered mini split low on charge. Tighten all connections and adjusted charge. System operating normal at this time. Discovered slight kink in suction line. If problem persists, need to replace section of suction line. Both systems heating at this time. Calibrated furnace combustion. Homeowner use $50 gift card