Resideo, which makes Honeywell Home thermostats ... which powers the thermostat. “We recommend using a C-wire to provide ...

The primary power for this thermostat is supplied via 24 vac source. A "C" wire is not required if using ... programmed only using the app. About The Honeywell Home T9 RCHT9510WF is part of ...

The Honeywell ... whether the thermostat provides some sort of password protection - which limits the ability to change the thermostat's settings. Indicates, when using a 2-wire setup, whether ...