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Hello,I am a retired mechanical engineer with 56 years in this business. I will go in depth with you, and up to a 6 hour time limit.
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The heat pump has a single stage compressor, but the thermostat in heating mode will have two stages, heat pump on stage 1 and auxiliary electric resistance heat in some applications for stage 2 heat. I would need the model number of the indoor air handler/ furnace to see if it has electric booster heat.
The model number you gave for the weathertron is not computing.