Your HVAC system works hard year-round to keep your home comfortable, but one of the simplest ways to keep it running efficiently is often overlooked: regularly changing the air filter.
What Does the Filter Do?
Your HVAC filter traps dust, dirt, pet dander, and other airborne particles before they enter the system or circulate throughout your home. Over time, that filter gets clogged, forcing your system to work harder. The result? Higher energy bills, reduced air quality, and potential strain on your system.
How Often Should You Change It?
For most homes, the filter should be replaced every 1–3 months. However, the exact timing depends on:
-
The type of filter (cheap fiberglass vs. pleated high-efficiency)
-
Whether you have pets
-
If anyone in the home has allergies
-
How often your system runs
A good rule of thumb: check the filter monthly and replace it when it looks dirty.
How to Replace Your Filter
As seen in the image above, this HVAC system is located in the attic and has a vertical filter slot. Here’s a simple step-by-step guide to changing your filter:
-
Turn off the system – It’s always safer to shut it down before opening access panels.
-
Locate the filter – In this case, the filter is slid into a slot between the return air duct and the air handler.
-
Check the size – The filter should have its dimensions printed on the side (e.g., 16x25x1).
-
Slide out the old filter – Note the direction of airflow arrows on the filter frame.
-
Insert the new filter – Make sure it’s facing the correct direction.
-
Replace the cover and turn the system back on.
Pro Tip
Use your phone’s calendar or a reminder app to schedule monthly filter checks. It’s an easy task that goes a long way toward keeping your system efficient and your indoor air clean.
Final Thoughts
Replacing your HVAC filter is a small maintenance task that pays big dividends. It improves air quality, extends the life of your system, and keeps your utility bills in check.
At True South Home Inspection, we often find neglected filters during our inspections. Don’t let a $10 filter turn into a $5,000 repair!
