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I currently have a Janitrol analog thermostat. It has 7 wires hooked up.

Terminal - Color
Y - Yellow
Com - Blue
R - Red
G - Green
w2 - Looks white
E/w3 - Looks pink
O - Orange

As far as I can tell, nobody ever answered his question - and I have the very same dillema. Now, in my case I have an AC/Heat Pump combination unit outside, and a Natural Gas furnace inside...