Complete 1 system a/c repair and preventative maintenance check. 2-year-old a/c. Furnace is 15 years old. Blower has slight layer of dust on it. Changed filter. Capacitor is good. Cleared drain line. System has no back up water safety device. DeltaT between return and supply is 16 degrees. Outdoor system is washed off good has good pressures. And good electrical components. Has no compressor saver or surge protection.