Bill Smith Plumbing & Heating repairs Rheem, Trane, Lennox, and Goodman furnaces. Gas furnaces are complex machines with many parts that work hard to heat your home. In the fall of each year, furnaces should be inspected to make sure they are running to manufacturer’s specifications. A well-tuned furnace heats more efficiently. This decreases monthly natural gas bills and saves homeowners money. Furnaces get dirty and they need to be cleaned. Their motors need to be serviced and lubricated. Our heating technician will clean your furnace, and oil its motors.