Heater not heating. Heating repair and maintenance tune up. Diagnose and perform annual heater maintenance service plan on Ruud heating system. Replace thermostat and check furnace on 5 year old HVAC system. Heater maintenance complete which will help lower heating cost for this residential customer. Recommend Air Scrubber to prevent mold and harmful particles from contaminating air in the home. Heating system is now ready for Texas weather.