The Impact of Air Filter Ratings on Your HVAC System

When it comes to maintaining your home’s heating system, one of the most overlooked components is the humble air filter. At Donahue’s Heating & Cooling, we often find that homeowners are unaware of the significant impact that filter selection can have on both air quality and system efficiency.

What is a MERV Rating?

MERV (Minimum Efficiency Reporting Value) ratings range from 1 to 20, with higher numbers indicating better filtration. Here’s what you need to know about common MERV ratings:

• MERV 1-4: Basic filtration for large particles
• MERV 5-8: Good for residential use
• MERV 9-12: Excellent for homes with pets or allergies
• MERV 13-16: Hospital-grade filtration
• MERV 17-20: Clean room and surgical settings

Finding the Right Balance

While it might seem logical to choose the highest MERV rating possible, this isn’t always the best solution. Higher-rated filters can restrict airflow, forcing your furnace to work harder and potentially leading to system strain and increased energy costs.

For most residential applications in the Greensburg and Irwin areas, we recommend filters with MERV ratings between 8 and 11. These provide excellent filtration while maintaining proper system airflow and efficiency.

Maintenance Tips

Remember to check your filter monthly and replace it according to the manufacturer’s recommendations. This simple task can:

• Extend your furnace’s lifespan
• Improve indoor air quality
• Reduce energy consumption
• Prevent unnecessary repairs

By understanding and properly maintaining your air filtration system, you can ensure optimal performance from your heating system while maintaining healthy indoor air quality throughout the year.