SESKStuff Everyone Should Know
SESK: Stuff Everyone Should Know · sesk.info/home-a-hvac-filter

How often does ENERGY STAR say to inspect, clean or change your furnace or AC air filter?

Once a month.

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  1. Once every five years
  2. Once a month ✔
  3. Only when it smells

Why: ENERGY STAR says to inspect, clean or change air filters once a month in your central air conditioner, furnace or heat pump. A dirty filter raises energy costs and can cause early failure.

Huh, didn't know that: ENERGY STAR says HVAC parts that lack lubrication cause friction in motors and increase the electricity you use.

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How can you spell cold with two letters? IC (icy).
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References

Answer: Once a month. ENERGY STAR says to inspect, clean or change air filters once a month in your central air conditioner, furnace or heat pump. A dirty filter raises energy costs and can cause early failure.

  1. ENERGY STAR: Maintenance Checklist www.energystar.gov/saveathome/heating-cooling/maintenance-checklist
    Inspect, clean, or change air filters once a month in your central air conditioner, furnace, and/or heat pump.
    Checked 2026-10-10.

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