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How often should filters be changed?

filter

You should inspect your filter every month and change it when it is dirty. Some months like July or January the unit will run a lot and the filters will get dirty faster. Some months like April or September the unit does not run much and you may not need to change the filter. Use good quality filters to protect your evaporator coil from getting dirty. The dirt could restrict airflow and heat transfer. Plus a good quality filter will keep the indoor air that you breathe cleaner. Cheap low quality filters catch very few particles and that defeats the purpose of a filter.

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