Arrived on site to perform fall tune up on a 2008 lennox unit. Furnace located in garage. Client stated no issues and cycled unit. Found filter dirty and replaced as client replaced his own filter. Blower assembly is dirty and has debris due to areas around home. Motor is good and free of oil. Inducer motor is good and in range of amps. All safety switches are operational. Clean blue flame created. Found unit to only have one drain line and no over flow switches on line recommended adding overflow. Gas line has no sediment trap and highly recommend. Found unit to have a high static pressure and above range which is causing air flow restriction into unit. Also found return vent partially covered up and advised that is not good and that should be clear and open to be able to intake as much air as it could due to being a upflow in a closet. Advised high temperature rise and high static pressure advised client o would like to safety inspection heat exchanger. Client is aware of reasoning a