As with a traditional furnace, it is extremely important to routinely change the filter in your geothermal unit. Duden & Silver offers a variety of filters that are specific to your geothermal unit to help keep your air clean.
Filters can remove dust, pollen, and microbes that can be harmful for you to breathe in. For cleaner air, click on the link below to find the right geothermal filter for your unit.