The Lennox folks won’t help you. I tried many times. Getting an Ecobee or any other normal thermostat to work with Lennox in Heat mode is easy. You’ll have to do some rewiring and yes the old post from 2018 is still valid. To get it working in AC mode is harder and I haven’t done it. I understand it can be done but you have to rewire things on the AC unit outside as well as the furnace inside. For the heater mode you only have to tweak the inside wiring as shown on the 2018 post so it is easier. I’ll never buy a Lennox heater again because of their attitude about using their own crappy thermostats that don’t work with ST or Hubitat. They do work with HomeKit and Alexa so I have as others have done hacked up workarounds like having our speakers tell Alexa to change the thermostat or making routines in Homekit to mimic what ST is better at doing. Anyway, good luck.
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