A complete, up-to-date, illustrated guide to the installation, maintenance, and service of gas, oil, and electric forced warm air heating and heat pump systems. Explores--in great detail--a large base of newer as well as traditional equipment, using the principles and practices of older furnaces as a means of understanding the newer, electronically controlled, high-efficiency furnaces. Features detailed discussion of the operation and diagnosis of controls--from the thermocouple to the SmartValve(R)--and provides a complete overview of all aspects of residential and light commercial heating. Includes photographs of the most up-to-date equipment throughout. KEY TOPICS: Climate Control and Comfort. Safety Analysis and Identification. Combustion and Fuels. Parts Common to All Furnaces. Components of Gas-Burning Furnaces. Basic Electricity and Electrical Symbols. Schematic Wiring Diagrams. Using Electrical Test Instrument and Equipment. External Service Wiring. Controls Common to All Forced-Air Furnaces. Gas Furnace Controls. High-Efficiency Furnaces. Components of Oil-Burning Furnaces. Oil Furnace Controls. Electric Heating. Estimating the Heating Load. Evaluating a Heating System. Installation Practice. Heating System Maintenance and Customer Relations. Energy Conservation. Indoor Air Quality. Zoning. Hydronic Heating. Heat Pumps and Add-On Air-Conditioning. MARKET: For HVAC technicians.