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I have a Trane XC95m furnace (modulating gas valve, variable speed blower) and XL1050 thermostat. The thermostat does not work as advertised (and Trane agrees) and I am thinking to switch to the Ecobee 4. Trane says the furnace can be wired to work with a 24V thermostat. Can the Ecobee control all the functions of that furnace, and if not, what will I be giving up??? Would there be a better choice?