Thermostats are a key component in any heating, cooling and ventilation system, as thermostats are the primary control unit that regulate the temperature of your home or business.
The term thermostat is derived from the Greek work “thermos”, meaning hot, and “statos”, meaning stationary. Thermostats sense the temperature of their environment and maintain your HVAC system's temperature at a desired setpoint.
Thermostats are considered to be “closed loop” control devices because they seek to reduce the error between the desired temperature and the temperature that is measured by the thermostat. And then the thermostat establishes control by switching the heating or cooling device on or off as needed.
Thermostats are constructed using a wide variety of methods, with varying technologies that allow the thermostat to measure the ambient air temperature and turn the heating and cooling system off and on.
Today, thermostats commonly use thermistor or bimetallic strips, expanding wax pellets or electric thermocouples to measure and control the temperature in your heating and cooling system. Is your thermostat broken or not functioning the way it should?
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