PGE offered free/cheap Nest thermostats for customers, so I got one for my grandmother's house.
The thermostat is an old mercury Honeywell q674f that has a bunch of wires I'm not familiar with.
The Google installation guide doesn't list some of the wires (X, O, L) and says the Nest might not be compatible, but I don't know why it wouldn't be.
It's a single fuel (electric) heat pump, so it should be pretty simple. Signal for fan, signal for heat, signal for cool.
You think I can replace this mechanical with the Nest? Which wires go where, and which don't I need anymore?
