Arrived at customers house for system not cooling. On arrival. Customer showed me to air handler unit. Air handler was on and fan was blowing. Went outside to condenser. Condenser was buzzing loud. Call the customer and had her here for her self. Capacitor was below Acceptable range on Herm side. Suggested customer change capacitor and contact her. Customer agreed. Changed out contactor and capacitor And unit is now running fine. Went upstairs to confirm and customer is creating proper delta. T.