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In old thermostat, one wire goes into both rh and rc. Where is this
What Is the Difference in Wiring RC and RH? | Hunker
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What is the Difference Between RH and RC Thermostat Wires
I purchased a 7-day programmable thermostat (RTH221B). Upon
hvac - How to move from RH/RC thermostat to C thermostat in AC only
hvac - How to move from RH/RC thermostat to C thermostat in AC only
All About Thermostat Wiring - Wifi Thermostat Judge
hvac - How to move from RH/RC thermostat to C thermostat in AC only
Thermostat wiring help needed ! - Other Heating Systems - BuildHub.org.uk