I installed a green LED light on the Thermostat to indicate when the 2nd stage is called upon. I bought an LED from radio shack that could be connected to 12VDC. A 1/4 in. dia. hole was drilled in the thermostat cover and the LED was mounted in this hole. Examining the AC wiring diagram/schematic indicated the yellow wire in the thermostat supplies 12volts to the AC cooling unit when the second stage cooling is required. The positive lead of the LED was soldered to the yellow wire and the negative lead was soldered to the 12 volt ground. Now I can easily tell when the thermostat is calling for the second stage.
On my unit when the 2nd stage is called for I glance at a themometer I have installed in a cooling duct an the supply air is typically approximately 40 degrees. WHen only the first stage is operating the supply air is approximately 52 degrees. These are the temps after the AC unit has been running at least 10 minutes and they will vary a little depending on internal ambient temperature.
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