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Discussion Starter · #1 ·
Looking to add a wifi thermostat (e.g. Ecobee, Nest, Honeywell) to a home with just two wires (red and white) running to each thermostat. Heat only. I read 24 volts AC on the wires when they are open

I want to have just one ecobee for the main floor, the other two can remain on dumb thermostats.

Possible?
 
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