How often do I need to replace the furnace filter?

It’s recommended by most manufactures that a 1″ air filter needs to be replaced every 2-3 months. 4″ air filters should be replaced at a minimum of around 6 months. But there are different kinds of filters in the market that you could change or clean less often. We recommend you use a filter with a high MERV rating (minimum efficiency reporting value).

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