Upon arrival, I turned on the downstairs zone only to find that the system starts to freeze. Quickly I turned on the upstairs zone. The pressures began to level out. This indicated that it’s going to freeze with only one zone on. The system currently has a cfm boosting fan in the duct work. I spoke with the homeowner to give him some options. We can wire the zones so the downstairs runs the entire system. This could cause uncomfortably on the u/s area. We could had a dump duct above the stairwell, upgrade the thermostat, and add sensors. This would allow more air movement, and the downstairs to factor in the temperature upstairs when operating. Also, this can lead to uncomfortable outcome. The final option is to go over options for variable speed units that can manage the refrigerant and air flow properly. Customer elected to have a comfort advisor come out on 10/24/2025 8am-10am arrival time.
