Upon completing the diagnostic found that the system is almost out of a refrigerant, the unit is little over 12 years old and plate of refrigerant type nowhere to be found, my assumption that the unit has R- 22 type of refrigerant, which was discontinued and we won’t be able to find parts or replacement units for that. Because of all of this, my recommendation is to replace entire AC system, I had submitted the information to the home warranty and waiting to hear back from them.