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The Honeywell T87 Round Thermostat is a thermostat that Honeywell International, Inc. first manufactured in 1953. [1] Henry Dreyfuss designed the thermostat based on a concept by Honeywell engineer Carl Kronmiller .
Most programmable thermostats also have a hold feature which suspends the schedule and effectively turns the thermostat into a manual thermostat. [5] The idea of the scheduling feature is that users will set a warmer or cooler temperature when the home is unoccupied to save energy and money.
Honeywell electronic thermostat in a store. Heating and cooling losses from a building (or any other container) become greater as the difference in temperature increases. A programmable thermostat allows reduction of these losses by allowing the temperature difference to be reduced at times when the reduced amount of heating or cooling would not be objectionable.
Honeywell offers a number of products and services across its four business groups: Aerospace, Home and Building Technologies (HBT), Safety and Productivity Solutions (SPS), and Performance Materials and Technologies (PMT). This is a partial list of products manufactured and services offered by Honeywell.
Honeywell was a component of the Dow Jones Industrial Average index from 1999 to 2008. Prior to 1999, its corporate predecessors were included dating back to 1925, including early entrants in the computing and thermostat industries. [7] [8] In 2020, Honeywell rejoined the Dow Jones Industrial Average index. [9]
A thermostat exerts control by switching heating or cooling devices on or off, or by regulating the flow of a heat transfer fluid as needed, to maintain the correct temperature. A thermostat can often be the main control unit for a heating or cooling system, in applications ranging from ambient air control to automotive coolant control.
A Single-Pole, Single-Throw (SPST) mercury switch on millimetre graph paper, device length approximately 1.5 cm Another mercury switch design. A mercury switch is an electrical switch that opens and closes a circuit when a small amount of the liquid metal mercury connects metal electrodes to close the circuit.
An actuator may be driven by heat through the expansion that most solid material exhibit when the temperature increases. This principle is commonly used, for example, to operate electric switches in thermostats. Typically, a (non-electronic) thermostat contains a strip with two layers of different metals, that will bend when heated.
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