Arrived on site to perform heating tune up on a 2013 lennox unit. Client stated no issues. Cycled unit and unit is operational. Found filter okay and slight dusty. Blower wheel is dusty. Motor is good and oil free. Clean flame heating home. Igniter is good. Flame sensor is okay. Inducer motor is in range and good. Drain lines are good and clear at this time. Safety switches are all good. Temperature rise is good at this time. Recommended adding a hard wire surge protectors but client bought a plug in one for now and is Better then nothing. Client stated she will be ordering her own filter and be keeping them on hand. She is aware. Cycled unit and units is operational. Went over how unit is running and conditions and client is aware and okay with so. Cycled unit and unit is operational upon departure.