Client wanted estimate to clean evaporator coil, upon inspection of system, found evaporator coil, full of biological growth and pretty dirty. Also, system is low on refrigerant. Being low on refrigerant means there is a leak somewhere in system, explained to client that leak could be in the evaporator coil and would not be able to determine that until a leak search is performed. So with that being said, advised client that a leak search would be in the best interest just in case the leak is in evaporator coil so that the coil can be replaced versus pulled out and cleaned, however, system is 13 years old and recommend replacing due to age and cost of repairs. Client is waiting to see what home warranty will cover. Home warranty does not kick in until October 3 and client will call us back when ready to make a decision.