Arrived to perform Ac tune up. Customer has no concerns. Set thermostat call for cooling. Observe indoor unit, service duct work, air filter, electrical connection, condensate system, coils and performed temperature readings. Return: 71.1* F. Supply: 55.3* F. Observe out door unit, service coils, electrical compartment, motors, refrigerate lines. Ac system operating ok at this time. Customer requested filter size. Gave customer filter size of 27x17. Reviewed estimates with customer. Customer declined estimates at this time. Customer satisfied with services today.