The AC Smartseal worked perfectly! I had lost more than half of the refrigerant in the heat pump due to small fractures or holes most likely in the evaporator area. The outside unit was fine without any holes. The HVAC specialist injected the Smartseal and added up to about 60% capacity refrigerant to see if the pressure holds. He checked the system after about two weeks and the pressure had increased somewhat! Therefore, he concluded that the Smartseal sealant had worked perfectly and he added refrigerant to 100% capacity. The HVAC is working perfectly fine saving a few thousand dollars!