
Thermostats
What These 24VAC Thermostats Do Not Support
The fastest way to rule a system out: line voltage, two-wire, fan coil, multi-speed fans, ERV and baseboard - and how to spot each before ordering.
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The fastest way to rule a system out: line voltage, two-wire, fan coil, multi-speed fans, ERV and baseboard - and how to spot each before ordering.

No C wire at the wall is not a dead end. Here is which wires are enough, what the adapter changes, and the cases that are truly incompatible.