Furnace clean and tune. Cycled system. Checked heat exchanger, ok. Checked and cleaned burners and flame sensor. Checked and adjusted gas pressures to maximize efficiency. Checked for levels of CO and XS air in exhaust. Normal levels found. No CO found in airstream. System operating normal at this time. Found damage to two wire to ac. Looks like it may have been chewed on by a pet. I taped up wires. Looks like the integrity of the wires are intact at this time. System operating normal at this time. Job complete. Quotes given for whole home humidifier and dehumidifier. 600