Performed tuneup on AC system. Cleaned indoor and outdoor coils, replaced air filter, cleaned and flushed drain line, inspected blower wheel, checked temperatures, checked static pressure, checked refrigerant pressures, inspected all major and minor electrical components. Client says that they have issues with allergies in home as well as found some biological growth buildup inside air handler, and there is no surge protection on system. Suggested that client have whole house air purifier installed along with UV light to kill any biological growth buildup And suggested having indoor and outdoor surge protectors installed to protect system from any power searches or lightning strikes. Client will review options and get back to us. Cycled and tested system, all operations OK at this time.