2-Ultimate Cooling Tune-Up Ductless Mini Split (includes (1) power head): Serviced and inspected ductless mini split system checking system electrical, safeties, controls to manufacturer specifications Ultimate Cooling Tune-Up: cleaned coils, brushed and cleaned traps, added pan treatment tablets to pan. tested and checked all controls, wiring connections. tested temperatures, checked filters. checked refrigerant temperature and pressures, tested static duct pressure. tested blower operation, tested cooling operation to ensure working within manufacturer specifications. Found basement system to have a 12° temperature difference. Add a refrigerant to manufacture specs temperature difference now is 28°.