How Often Should You Change Your Furnace Filter?
Regularly replacing your furnace filter is essential for maintaining optimal air quality and HVAC system efficiency. Below is a general guideline on recommended replacement intervals based on filter thickness and MERV ratings:
Furnace Filter Replacement Frequency Chart
| Filter Thickness | MERV 8 (Basic) | MERV 11 (Enhanced) | MERV 13 (Superior) |
|---|---|---|---|
| 1-Inch | Every 1–2 months | Monthly | Monthly |
| 2-Inch | Every 2-3 months | Every 2–3 months | Every 2 months |
| 4-Inch | Every 3-4 months | Every 3-4 months | Every 3 months |
| 5-Inch | Every 4-5 months | Every 4-5 months | Every 4 months |
Factors Influencing Replacement Frequency:
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Pets: Homes with pets generally require more frequent filter changes due to pet hair and dander.
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Allergies: Allergy sufferers may benefit from more frequent replacements, especially at higher MERV ratings.
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Indoor Air Quality: High-pollution areas, smokers, or heavily trafficked indoor spaces may require more frequent filter replacements.
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System Usage: Increased HVAC usage (such as during extreme hot or cold weather) may necessitate more frequent filter changes.
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