How do I know if my HVAC system is 2 stage?

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If the HVAC was a two-stage system, we would have seen two separate wires going into W1, W2, and another two wires (if the system has an air conditioner) going into Y1 and Y2 terminals. Note: This image above is a thermostat that supports 3H/2C. But it is wired for as 2H/2C (2 stages of heating & cooling).

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