A thermostat is a device for maintaining the temperature of a system within a range by controlling, either directly or indirectly, the flow of heat energy into or out of the system.
=Mechanical=
Mechanical thermostats are used to regulate dampers in rooftop turbine vents, reducing building heat loss in cool or cold periods.
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Heating, Ventilating, and Air Conditioning :: Mechanical
Heating and Cooling :: Electronics and Electrical
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CornerHardware - Instructions for installing a programmable thermostat.
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How Stuff Works - Detailed illustrations on how thermostats work, wiring, and components.
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On Q - Installation and wiring instructions for thermostat with remote monitoring capabilty.
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Thermostats USA - Information on application, features and benefits, and troubleshooting.
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White-Rodgers - Installation and operating information for digital programmable thermostats.