How do electromechanical, manual, and programmable thermostats differ?
Electromechanical – or manual – thermostats are the old-fashioned mercury units that have internal coils to expand or contract in response to temperature change. This type is becoming obsolete for two reasons: digital thermostats are able to more accurately register and respond to temperature changes, and the purchase of products containing mercury has been restricted or banned in many states. However, manual thermostats remain popular due to their low cost, the familiarity of their controls’ design, and the ease of their use. Manual digital thermostats use an electronic temperature sensor to register changes in the room temperature that then compare these changes with the settings selected by the user. If there is a difference between the room temperature and the set temperature, a command is sent to the heating or cooling system that action is needed. For this type of unit, you will still have to physically adjust the setting of your preferences whenever you would like to adjust the
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