Why You Should Keep Your Air Purifier Running & How to Avoid Stinky Filter Surprises

Hey there, home health enthusiasts! If you own an air purifier, you probably already appreciate the clean, fresh air it provides. But did you know that how you use and maintain your purifier—especially when it comes to turning it off or storing it - can have a big impact on its effectiveness and even your indoor air quality? Today, we’re diving into why it’s generally better to keep your air purifier running long-term, and what can happen if you don’t.

The Case for Running Your Air Purifier Continuously
Air purifiers are designed to work best when they’re consistently cleaning the air. Here’s why:
  • Consistent Air Quality: By running continuously, your purifier maintains a steady level of air purification, capturing pollutants like dust, pollen, pet dander, and even volatile organic compounds (VOCs) before they accumulate.
  • Filter Health: When in use, the airflow through the purifier helps keep the filter dry. Moisture is a key enemy of filter longevity and can lead to microbial growth. An active unit evaporates any accumulated moisture, preventing the damp conditions that microbes love.

The Problem with Stopping and Starting: Why Filters Develop Odors
It might be tempting to turn off your purifier when you’re away or not in a room, but here’s what can happen if you use it intermittently and then store it without proper care:

1. Filters Capture More Than Just Dust:

  • During operation, filters - especially HEPA and activated carbon types - absorb moisture, odors, and microscopic organisms along with particles. If the unit is turned off and stored without removing these contaminants, they remain trapped.
2. Moisture Trapped in Filters:
  • When a used filter sits idle in a purifier, any absorbed moisture isn’t actively evaporated. This creates a damp environment where bacteria, mold, and mildew can thrive.
  • These microorganisms can cause unpleasant odors, often described as musty, sour, or “dirty socks” smells.

3. Health and Performance Implications:
  • A filter overrun with microbes doesn’t just smell bad; it can also release those microorganisms into your air when restarted, potentially affecting indoor air quality and health. Additionally, a clogged or contaminated filter loses efficiency and can strain the purifier’s motor.

Tips for Maintaining Your Air Purifier and Preventing Odors
To get the most out of your air purifier and avoid these issues, consider these practical tips:

  • For Long-Term Use: Keep it running! Modern purifiers are energy-efficient, and many have auto-mode settings that adjust fan speed based on air quality, saving energy while maintaining performance.
  • If You Must Store It: 
  1. Remove and Dry the Filter: If you plan to store your purifier unused for an extended period (e.g., over a month), take out the filter. Clean it with a vacuum cleaner if possible, and ensure it’s completely dry before storage.
  2. Store in a Dry, Ventilated Place: Keep the filter in a sealed plastic bag or wrapped in plastic to protect it from dust and moisture, but make sure it’s thoroughly dry first to prevent trapping humidity.
  3. Revive Before Reuse: When pulling a stored filter out for reuse, consider giving it a few hours in the sun. Sunlight can help reduce microbial growth and odors. Always check for any lingering smells or visible damage before reinstalling.

  • Regular Maintenance is Key: Even with continuous use, follow the manufacturer’s guidelines for filter replacement and cleaning. Most HEPA filters need replacing every 6-12 months, while carbon filters may need more frequent changes (every 3-6 months). Regular maintenance prevents overload and keeps your air fresh.
Conclusion: Keep It Running, Store It Smart
For the best air quality and to extend the life of your purifier, running it continuously is your safest bet. It maintains filter health and prevents the moisture buildup that leads to odors and microbial growth. If you do need to store it, proper filter care - drying, sealing, and sun-reviving - can make all the difference.

Have you encountered filter odors or found a maintenance trick that works? Share your experiences in the comments! 🌬️💨
Back to blog