Furnace precision tune up; clean and tune up furnace; clean burners, test ignition components, adjust gas level, test safety circuit, check indoor motors, checked all electrical components, tested indoor air flow, checked heating temperatures, and tested overall furnace operation. Talked about installing a iwave air purifier. This will help clear the air of any allergens and providing clean fresh air throughout the home. Will follow up Friday morning in regards to the air purifier. Also replaced the air filter will be placing a new one on order for next replacement. All other recommendations declined at this time.