Performed preventative maintenance for a newly installed air conditioning system. Replaced the customer supplied Merv 11 20x25x5 air filter. Filter was in poor condition at just about a year old. This restricts airflow and keeps the system from operating normally. Filter should be changed once every 6-12 months. With this system preferably 6 months. Inspected all the electrical components. Confirmed proper high and low voltages. Tested the temperature split between the supply and return. System is operating at a 20° differential on a 63° day. Tested the amp draw for the blower, compressor and fan motor. All were operating within the manufacturer specs. System is operating properly at this time. Customer is interested in updating some of the older damaged flex runs in the attic. Would need to come out with estimator to properly inspect and quote. No charge for todays visit due to free with install maintenance.