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Trying to upgrade to Nest. What is O/B wire & why is white wire in W2/Aux? : r/Nest
hvac - Why W (heat contactor) and E Aux Heat connected in Thermostat - Home Improvement Stack Exchange
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Have a question about Honeywell Home 7-Day Programmable Thermostat with Digital Backlit Display? - Pg 4 - The Home Depot
What is Auxiliary Heat? (2023 Guide)
Thermostat Wiring and Operation (with Heat Pump) - Home - Wyze Forum
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NOTE: This item is non-programmable thermostat Easy to see read backlit display with soft-touch button interface Quality temperature control for heat
Honeywell Home RTH3100C1002 Digital Non-Programmable Heat/Cool Pump Thermostats