Install a Programmable Thermostat - Lowe's The C wire, or “common wire” enables the continuous flow of 24 VAC power to the thermostat. A programmable thermostat lets you customize the heating and cooling of your home to your needs, ensuring the heat and air conditioning aren't running when.
How to Install an Energy-Saving Programmable Thermostat This. Y speaking, power flows from the R (red) wire, but not continuously (not on its own, anyway). Q I'd like to put in a new programmable thermostat to better control my energy costs. Can I install it myself? —Sam Aleksy, Chicago. Lance Marques, HVAC.
How to Replace an Analog Thermostat with a Dital HD - YouTube To make it continuous requires a common wire to complete the circuit. Nov 9, 2011. howto how to dital thermostat analog How-to install DYI Replace. did not hook up a wire to the C terminal or if your new thermostat does not.