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Central heating and air conditioning HVAC systems are all controlled by some kind of wall-mounted thermostats that sense room temperature and turn the systems on and off whenever necessary. There are quite a number of different thermostat styles, ranging from the old standard mercury-contact thermostat in the familiar Honeywell dial style, to extremely modern digital thermostats that operate entirely by touch-screen controls. When an existing thermostat goes bad, it's a fairly easy matter to replace it.

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Install the thing about why most installations.

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If you have both an Rh and an Rc wire, the former powers the heating and the latter powers the cooling using two separate transformers. If, for example, you have an R wire and an Rc wire, the R wire controls the heating system. G: This wire controls the blower fan, which is responsible for pushing the warm or cool air through all the vents in your house. It is not a ground wire!

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