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If there is not an extra unused wire running from the thermostat to the furnace, and using the g-wire as a common wire is not an option, in most cases, installing an Emerson Thermostat Common Wire kit is the best solution.
See how easy it is to install and connect a Sensi Touch 2 smart thermostat.
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A how-to guide to installing the base of your Sensi smart thermostat.
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See how easy it is to connect Sensi room sensors. Sensi room sensors are designed to remotely monitor temperature and humidity in different rooms when paired with a compatible Sensi smart thermostat.
3:32
A how-to guide to removing the existing thermostat base before installing your Sensi™ thermostat.
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A how-to guide to removing your old thermostat before you install your new Sensi thermostat.
1:20
This video demonstrates how to install and connect your Sensi smart thermostat
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