The most manufacturers of ventilation units require to change air filters at least twice a year: before and after heating season. The main reasons to obtain new air filters in autumn are:
Energy savings. During cold season, air handling units operate mostly at maximum load. Thus, you keep good air quality at home while saving expensive heating energy. During the warm season the filter gets contaminated quicker by various organic and non-organic particles, such as insects, pollen, fluffs, dust, etc. Pressure drop through the filters increases and thus energy consumption of fans increases as well. We presented additional monthly energy expenses due to averagely contaminated filters in the chart below. As you may see in case of air handling units to apartments or small houses, such as Domekt 200 / 250 / 400 /450, Smarty, RIRS 400, FLEXIT UNI 2/ UNI 3, may cost up to 8 EURO if you live in “expensive energy” countries as Denmark or Germany. For the large house (RIS 700, Domekt 700) it may even cost up to 15 EURO.
Lower airflow volume. The most residential air handling units, as ea. Domekt, FLEXIT, RIS, RIRS and many others do not have constant airflow mode (as one of the rare exceptions are Smarty X by SALDA). Units without constant airflow mode are not able to maintain the same airflow according to the pressure drops on filters. Therefore, you may get a lower fresh air volume at home.
The better air quality. During the summer period filters capture a lot of biological particles. Higher air humidity creates an ideal media for molds and bacteria to grow. It may lead to bad odors or even microorganisms to appear in the ventilation system, as well in your indoor air.
Autumn brings higher household expenses. Thus CleanFilter offers optimal price for the high-quality filters. Filters for your healthy indoor air you may find here: https://cleanfilter.eu/en/shop/