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®—and provides a complete overview of all aspects of residential and light commercial heating. Includes photographs of the most up-to-date equipment throughout. 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. For HVAC technicians.