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.
Install the thing about why most installations.
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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