Two years ago I had a Lennox G61 furnace installed by a large HVAC contracter in the area. At the time my Maple/Chase thermostat's instruction manual said it is not for two stage furnaces. My furnace contracter told me that with the electronics in the G61 my thermostat is fine. I have now heard that it was improperly installed by hooking two wires on the W1 terminal and not using the W2 terminal. In essense I am not getting the savings from a two stage unit. Who is right?