Arrived at customers house for system check. I do rival customer showed me to air handler in closet. Open up cabinet and inspected inside. Saw a bit of dirt on the blower wheel. Brought this to customers attention. Suggested a possible pull and clean and also an upgraded electronic filter. Sent customer estimates for both. All electrical wiring was connected. Underneath of evaporator coil had a bit of dust on it. Started up unit and unit was giving close to proper delta-t. Went outside to condenser and hooked up gauges. Gauges we're showing low Freon. Brought this to customers attention and suggested we add a pound. Customer agreed. Added lb and all pressures and readings are now looking correct. Listening to the compressor startup me and the customer agreed that it sounded rather rough. Suggested to the customer he get a hard start kit to expand the life expectancy of the unit. Sent customer estimate. Proper voltage is going across contactors. Capacitor was within acceptable range. Su