Came out to perform a preventative maintenance on a furnace. Customer had a new system installed in May of this year by another company. I inspected overall installation of the equipment. Inspected the blower assembly, motor, electrical components, burners, flame sensor, ignitor, gas valve, inducer motor, pressure switch and furnace function. Checked thermostat operation, amps, temperatures and gas pressure. System is heating properly at this time. Recommended customer add more return air to help improve airflow to system and help with efficiency.