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Not only do clean furnace filters improve air quality by removing allergens more effectively, they also maximize the operating efficiency of your heating system—and a well-maintained heating system is a necessity during the winter. Most furnaces need a filter change every one or two months, but you may have to do it more often if you have a very dusty home or pets that shed. Replacing your own filter is relatively simple (with help from the furnace manual), but you can also hire an HVAC professional to clean the furnace, check for the presence of hazardous gases, make any necessary repairs, and replace the filter.
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