Performed diagnostic assessment of York HVAC system with heat pump, multi-zone configuration, and whole home filtration after customer reported inadequate heating performance. Located wide-open intake vent damper on unused makeup air system allowing cold air infiltration; manually closed to improve system efficiency. Identified non-functional air exchanger with failed fan motor and damper (parts obsolete); scheduled advisor visit for replacement quote. Heat pump and zoning systems operating correctly; gas furnace test confirmed proper function.
