That is useful information. It is too bad that there is no way to know
that until you have already purchased a unit, and it does not seem
possible based on the labeling on the hardware. I already bought a
non-smart thermostat that is working well for...
We do not have air conditioning but have a two-stage furnace. There are
only four wires going to the thermostat: Red (main power), Green (fan),
W1 (heating stage 1), and W2 (heating stage 2). There is no fifth wire
available for an independent C (com...