The majority of heat pumps offer permanent filters. These are true long-term investments because they will last for a long time. However, if you want to maintain their optimal performance, it is vital to clean them regularly. Cleaning a heat pump filter involves removing it, washing it, and then re-attaching it to the unit. Most units come with an instruction manual that shows how to detach the filter. You should be careful while washing it, but also ensure to wash it thoroughly. Make sure the filter is dry before re-attaching it to the base device. You can wash the filter as many times as you want, and continue using it.