Your HVAC system serves you all year round, so it's important to have it in top working condition. Your HVAC expert may schedule appointments for regular maintenance, but a preventative maintenance checklist of your own will keep the machine working efficiently for years to come. Proper maintenance can help you lower utility bills, improve system efficiency, reduce emergency repairs, and improve your indoor air quality. Take a look at three maintenance tips to help you increase your HVAC's lifespan.