Understanding MERV Ratings For Better Indoor Air Quality


The Impact of Air Filtration on Your Home’s Health

When it comes to maintaining optimal indoor air quality, one of the most crucial yet overlooked components is your HVAC system’s air filter rating. At Coastal Comfort Inc, we regularly encounter homeowners who are unsure about the significance of MERV ratings in their heating and cooling systems.

What is MERV?

MERV (Minimum Efficiency Reporting Value) represents a filter’s ability to capture particles between 0.3 and 10 microns. The rating scale runs from 1 to 20, with higher numbers indicating better filtration.

Common MERV ratings and their applications:

  • MERV 1-4: Basic residential filtration
  • MERV 5-8: Better residential and light commercial
  • MERV 9-12: Superior residential and commercial
  • MERV 13-16: Hospital and general surgery
  • MERV 17-20: Clean room and specialized filtration

For most residential applications, we recommend filters with MERV ratings between 8 and 13. These provide excellent air quality without restricting airflow to your system. Higher ratings aren’t always better – they can actually strain your HVAC system if not properly matched to its specifications.

Remember that regular filter replacement is just as important as choosing the right MERV rating. Even the best filter becomes ineffective when clogged with debris. We suggest checking your filter monthly and replacing it every 60-90 days for optimal performance.

By understanding and implementing proper filtration standards, you can significantly improve your indoor air quality while maintaining your HVAC system’s efficiency. Contact our team for professional guidance on selecting the perfect filtration solution for your home.