How often to change furnace filter in house with 100% working
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When in doubt, we suggest that you check the filter to see if it is truly dirty. Lower quality fiberglass filters are more affordable, but they don’t last long and need to be changed every month. Usually “30 days” is on the low end, and up to “12 months” on the higher end.
The size of your home furnaces and air conditioners in smaller homes need to pump less air for the same amount of temperature change, which may mean less frequent filter changes.
Though you don’t have to change your furnace filter every single month, it should be changed every three months at most, as the seasons change. You should ideally change your air filter every three months, however, there are certain factors to consider when determining when to change out an old filter. If you’re thinking that you only have to change your filter once a year, you may well be shortening the life of your furnace. Determine your filter’s merv and thickness.
