Heater not heating. Heating repair and maintenance tune up. Diagnose and perform annual heater maintenance service plan on Lennox heating system. Replace capacitor and check furnace on 13 year old HVAC system. Heater maintenance complete which will help lower heating cost for this residential customer. Evaporator coil is leaking. Recommend replacement evaporator coil, leak repair, or new Comfortmaker air conditioning system. Heating system is now ready for cooler weather.