Air conditioner filters are usually replaced every 2-3 months, or every six months, so the lifespan of an air conditioner filter can generally be more than 2 years; however, to protect high-efficiency filters for later use and ensure the safe operation of the clean room, many smart homeowners replace the initial efficiency filter monthly, the medium efficiency and sub-high efficiency filters every 3 months (or, as mentioned earlier, use high-efficiency filters as protection filters in the last section of the air cabinet), ensuring a lifespan of over 5 years (or even 10 years) for high-efficiency filters. Furthermore, because the resistance of a new filter is low after replacement, it significantly reduces the air conditioning load, and the cost of replacing the filter is far less than the electricity cost required for air conditioning operation. Frequent replacement of pre-filters in the previous stage can actually allow the air conditioner to operate under a low-resistance load, saving a significant amount of electricity.

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