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Understanding MERV RatingsWhy MERV 8 Is Often the Smart Choice for Austin HomesBack to HVAC 101
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TL;DR - What You'll Learn
✔ MERV ratings measure how effectively an air filter captures airborne particles.
✔ Higher MERV isn't always better because more filtration can also restrict airflow.
✔ For many Austin homes, MERV 8 provides an excellent balance of filtration and HVAC performance.
✔ MERV ratings measure how effectively an air filter captures airborne particles.
✔ Higher MERV isn't always better because more filtration can also restrict airflow.
✔ For many Austin homes, MERV 8 provides an excellent balance of filtration and HVAC performance.
When allergies flare up, many homeowners think the solution is simple: "Let’s buy the strongest air filter possible." But when it comes to HVAC filtration, higher isn’t always better.
In this article, we’ll explain the term you see printed on every air filter: MERV. We’ll cover what it means, how it affects your HVAC system, and why MERV 8 is often the right choice for many Austin homes. We’ll also discuss when a higher MERV filter may be appropriate.
If you’re interested in upgrading your filtration system, we’ll cover that in Upgrading Filtration in Older Austin Homes: The Right Way to Increase MERV.
Filter Maintenance Basics
We all know the basics of HVAC filters. Changing filters regularly is critical. For a typical Austin home, the guidelines for filter changes are:
Depending on what happens in your home or during heavy pollen seasons, you might need to change your filters more often. But what about that number on the side of just about every filter you buy? What does MERV mean?
- 1-2 inch filters: replace about every month
- 4-6 inch filters: replace about every 4-6 months
Depending on what happens in your home or during heavy pollen seasons, you might need to change your filters more often. But what about that number on the side of just about every filter you buy? What does MERV mean?
What Is MERV?
MERV stands for Minimum Efficiency Reporting Value. It’s a rating system developed by ASHRAE (American Society of Heating, Refrigerating and Air-Conditioning Engineers) to measure how effectively an air filter captures particles.
Think of the MERV rating as a measure of how fine the filter's "screen" is. The finer the filter, the smaller the particles it can capture—but the harder your HVAC system has to work to pull air through it.
MERV ratings range from 1 to 16 (or higher for more specialized systems). Higher numbers mean the filter captures smaller particles, but they also restrict airflow more. Here’s a simplified breakdown:
Think of the MERV rating as a measure of how fine the filter's "screen" is. The finer the filter, the smaller the particles it can capture—but the harder your HVAC system has to work to pull air through it.
MERV ratings range from 1 to 16 (or higher for more specialized systems). Higher numbers mean the filter captures smaller particles, but they also restrict airflow more. Here’s a simplified breakdown:
For years, MERV 8 has been the industry standard for residential air filtration. But you’ll commonly see MERV 11 and even as high as MERV 13 filters in your local hardware store. You might also hear these higher MERV ratings referred to as “air cleaners” instead of “air filters".
When we talk about filtration for this article, we’re focusing on filters installed in your HVAC system, not standalone air purifiers. For additional background, the U.S. EPA has helpful guidance on residential filtration.
When we talk about filtration for this article, we’re focusing on filters installed in your HVAC system, not standalone air purifiers. For additional background, the U.S. EPA has helpful guidance on residential filtration.
Why We Often Recommend MERV 8
For many Austin homes, MERV 8 strikes the right balance between filtration and airflow. MERV 8 filters:
A MERV 8 filter captures about 70-85% of particles sized between 3 and 10 microns, which includes the particle sizes most commonly found in our area’s pollen and mold. Just as importantly, MERV 8 usually allows your system to maintain proper airflow. And airflow is critical for HVAC performance.
- Capture most pollen
- Capture most mold spores
- Protect equipment from these particles
- Maintain airflow by not being too restrictive
A MERV 8 filter captures about 70-85% of particles sized between 3 and 10 microns, which includes the particle sizes most commonly found in our area’s pollen and mold. Just as importantly, MERV 8 usually allows your system to maintain proper airflow. And airflow is critical for HVAC performance.
The Takeaway
If your system was designed for higher MERV filtration – by all means, use it! Better filtration in this case means better indoor air quality.
But if you’re unsure, MERV 8 is usually a safe and effective choice for many Austin homes. It captures most of the particles that matter locally without creating unnecessary airflow restrictions.
If you’re considering higher-MERV filtration but want to make sure your system can handle it, Bluebonnet AC Services can help evaluate your setup and recommend the right approach for your home. Call 512-470-6240 or book online to schedule an evaluation.
When you're ready, learn more in Upgrading Filtration in Your Home, where we explain how to determine whether your HVAC system can safely support higher-efficiency filtration.
But if you’re unsure, MERV 8 is usually a safe and effective choice for many Austin homes. It captures most of the particles that matter locally without creating unnecessary airflow restrictions.
If you’re considering higher-MERV filtration but want to make sure your system can handle it, Bluebonnet AC Services can help evaluate your setup and recommend the right approach for your home. Call 512-470-6240 or book online to schedule an evaluation.
When you're ready, learn more in Upgrading Filtration in Your Home, where we explain how to determine whether your HVAC system can safely support higher-efficiency filtration.