Understanding MERV Ratings The Key to Better Indoor Air Quality

01/17/2025 By George

Demystifying MERV Ratings for Homeowners

If you’ve ever shopped for an air filter for your HVAC system, you’ve probably encountered MERV ratings. But what exactly do these numbers mean for your indoor air quality and system performance?

MERV (Minimum Efficiency Reporting Value) ratings range from 1 to 20, with higher numbers indicating better filtration. Here’s a breakdown of what different MERV ratings mean:

Basic Filtration (MERV 1-4)

– Catches large particles like dust and pet hair
– Minimal protection against allergens
– Common in window air conditioning units

Better Filtration (MERV 5-8)

– Traps mold spores and fine dust
– Filters out most pet dander
– Ideal for residential HVAC systems

Superior Filtration (MERV 9-12)

– Captures lead dust and auto emissions
– Filters bacteria and small allergens
– Perfect for homes with allergy sufferers

Hospital-Grade Filtration (MERV 13-20)

– Removes microscopic particles
– Catches smoke and oil droplets
– Used in hospitals and clean rooms

When selecting a filter, remember that higher MERV ratings also mean:
– Increased air resistance
– More frequent filter changes
– Potential strain on older HVAC systems

For most Chicago area homes, we recommend MERV 8-11 filters for optimal balance between air quality and system efficiency. However, the right choice depends on your specific needs and system capabilities.

Remember to change your filters regularly to maintain proper airflow and ensure your heating and cooling system operates at peak efficiency throughout all seasons.

Contact us today to help determine the best filtration solution for your home’s specific needs and ensure your system is operating at its best capacity.