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Great - thanks guys! I'll connect it to the Y. So what is the C terminal that I have it connected to currently?

So since the blue wires are only listed under heat pump, does that mean I have a heat pump? How would I figure that out?

I mentioned that it is heating and air conditioning, but I don't know...

So I'm not quite sure what I am supposed to look for on that page (or "trace") that would give me my answer. That site does not suggest anything for a blue wire except to go to Y2 for a heat pump,...

Hmmm. Well, I attached it to the C terminal and the heat at least seems to be working. What does the Blue and Y terminals do? Are you sure that it's Y and not C?

Hi. I'm trying to install a Honeywell RTH7600 programmable thermostat. I've detached my old thermostat, and I'm trying to figure out how to match up the wires. It's heat and air conditioning, and...