Performed combo tune up on 8 year old Lennox system. Cycled system through heating and cooling modes. Checked indoor and outdoor unit electrical and system components. Homeowner just replaced his filter and it is clean. Heating components all check good. Blower wheel is starting to get dirty and accumulating dust. Recommended homeowner to upgrade his filter to a Merv 16 filter for better filtration. Temperature rise is within range in heat. Checked outdoor unit electrical and system components. Secondary motor control is within range. Primary motor control is in good condition. Refrigerant levels check ok and system is producing proper temperature split and cooling correctly. Pulled off all panels and condenser fan motor and thoroughly washed out condenser coil inside and out. Compressor amp draws are in range as well as condenser fan motor amps. Went over findings and recommendations. Cycled system, system is fully operational upon departure.