4 Wire To 5 Wire Thermostat

Upgrading From A 4 Wire Thermostat To A 5 Wire Thermostat
Upgrading from a 4 Wire Thermostat to a 5 Wire Thermostat . Bob installs a smart thermostat, which requires a five wire connection. Our older thermostat has only four wires. Bob shows you how to upgrade from a four wi... www.youtube.com

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