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Goodman outside a/c unit , inside gas furnace is a xenon. XF80(45-115) gas fired warm air furnace the thermostat is a smart solutions VT1000 talking thermostat

Thanks everybody for the input. looking at one of the pictures here of my instruction manual i see 24 v in drawing, but am still confused about the one picture with the white thing that says 120 v that is plugged into the thermostat cover. Dont want ...

yes looking at all my pictures including picture with manual , still trying to figure out if i can use a nest learning thermostat.