How Often Should I Replace My HVAC Filter and What Filter Should I Use?
TL;DR: Most homes should replace their HVAC air filter every 3 to 4 months using a standard MERV 8 or lower pleated filter. Higher MERV filters are usually unnecessary and can restrict airflow, strain your system, and increase long-term costs.
How Often Should You Replace Your HVAC Filter?
Most residential HVAC systems use a disposable pleated air filter. For the majority of homes, this filter should be replaced every three to four months. How often you need to change it can vary based on how frequently your system runs, how dusty your home is, and the type of filter being used.
In New Mexico, dust and outdoor conditions can cause filters to load up faster than expected. A dirty or clogged filter restricts airflow, which makes your HVAC system work harder and can reduce comfort, efficiency, and system lifespan.
What HVAC Filter Should You Use?
For most homes, a MERV 8 or lower pleated filter is the best choice. The MERV rating refers to how effectively a filter captures particles from the air. A MERV 8 filter does a good job removing common household dust, pollen, and debris while still allowing proper airflow through the system.
This level of filtration is typically all that is needed for a standard residential HVAC system to operate efficiently and reliably.
Be Careful With High MERV Filters
Many filters are marketed as electrostatic or hypoallergenic. While those claims sound appealing, higher MERV filters are thicker and more restrictive. In many residential systems, they can reduce airflow enough to cause the blower motor to work harder than it should.
Over time, restricted airflow can lead to higher energy use, increased wear on system components, and more frequent filter replacements. These filters often end up costing more without providing real benefits for most homes.
For homeowners concerned about dust, allergens, or overall air cleanliness, our indoor air quality services can help improve comfort and air circulation throughout your home.
When a Different Filter Might Be Appropriate
There are situations where a different filtration setup may make sense, such as homes with specific medical needs or systems designed to handle higher airflow resistance. In those cases, it’s best to consult a professional before switching to a higher-rated filter.
Key Takeaways
Most HVAC systems use disposable pleated air filters
Filters should typically be replaced every 3 to 4 months
A MERV 8 or lower filter is ideal for most residential systems
Higher MERV filters are not always better and can restrict airflow
Marketing terms like “hypoallergenic” do not guarantee better performance
Using the wrong filter can increase system wear and operating costs
If you’re unsure which filter is right for your system, Horizon HVAC & Plumbing is happy to help during our HVAC preventative maintenance service, where we inspect your system and make recommendations based on your home and equipment.
