I'm looking at adding a Nest thermostat to our house, as my mercury one is unreliable. I was going to call someone to hook it up because I just don't know about this stuff, but I can't even get past Google's compatibility checker to see it a Nest thermostat will even work with the wires I have.
There are no labels, markings, or identification on the wires anywhere. Nor are there on the existing thermostat.
Does anyone know about this stuff? All I want to know is if I should even bother calling someone to hook up a Nest. Here's the thermostat, front and back.
The house was built in 1989, and it's the original gas furnace if that helps. No air conditioning.
