In Pittsburg, CA, I repaired a Lennox Elite EL296 gas furnace that was blowing cold air. The issue was traced to a worn-out igniter and a dirty flame sensor. I replaced the igniter with an OEM part, polished the flame sensor, and cleaned the combustion chamber. I also inspected the heat exchanger for cracks and ensured proper venting. The system was calibrated, and all safety controls were tested for functionality. After running multiple heating cycles, the furnace was restored to full performance, providing the homeowner with reliable and efficient heating.