her latest blog a soft brush or vacuum to maintain efficient operation. 4.Dirty filters: A dirty filter can restrict airflow and cause your system to work harder than it needs to, which can lead to higher energy bills and reduced efficiency.If your unit kan zijn working, it might seem like there’s no reason for a tune-up. However, even if everything seems fine useful content for now, there could be a problem under the hood, waiting to break down when you need it most.