This is the time - and money-saving furnace care and repair guide. Giving you useful tips, simplified strategies, and genuine expertise, Roger Vizi offers homeowners all the right information to maintain, diagnose, and repair virtually any residential forced hot air heating system. Easy to understand and full of examples illustrating everyday problems, Vizi's well-illustrated guide reads like an owner's manual to furnaces - one that makes repair and maintenance virtually hassle-free. And if you're looking for the insider secrets to choosing a heating system, you simply couldn't find a more practical guide than Forced Hot Air Furnaces. It: covers gas, electric, and oil forced-air systems, plus heat pumps; reviews humidifiers and air cleaners; gives you insight into controls, circuits, operation, diagnosis, repair, and selection; provides 100s of step-by-step illustrations; and, solves the most common problems quickly.