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Legacy Media
Nov 183 min read

How Often Should You Change Your HVAC Filter?

Regularly changing your HVAC filter is essential for keeping your heating and cooling system running efficiently. However, many homeowners are unsure of how often they should replace the filter, leading to unnecessary repairs, energy waste, or even poor indoor air quality. 


This post will break down the factors that determine how frequently you should change your HVAC filter and how following the right schedule can keep your system and home healthy.


Why Changing the HVAC Filter Is Important


Your HVAC filter serves as the first line of defense, trapping airborne contaminants such as dust, pollen, pet dander, and mold spores. If the filter becomes clogged, airflow is restricted, making the system work harder to regulate the temperature in your home. Over time, this strain can reduce the lifespan of your HVAC unit, increase energy bills, and negatively impact indoor air quality.


HVAC system


  • Improved Efficiency: A clean filter allows for smooth airflow, reducing the workload on your system.

  • Lower Energy Costs: A clogged filter forces the HVAC system to use more energy, increasing your utility bills.

  • Better Indoor Air Quality: A clean filter ensures the air circulating through your home is free from allergens and pollutants.

  • Prolonged Equipment Lifespan: When the system runs efficiently, it experiences less wear and tear, reducing the need for repairs.


General HVAC Filter Replacement Schedule


The ideal frequency for changing your HVAC filter depends on several factors. However, a general guideline is to replace the filter every 1 to 3 months. Still, the exact timing may vary based on conditions in your home, the type of filter, and how much the system is used. Below are some factors that can affect your filter replacement schedule.


HVAC Filter


Type of HVAC Filter


HVAC filters come in different materials and thicknesses, which impact their lifespan. Here are some common types and their replacement schedules:


  • Fiberglass Filters: These inexpensive filters typically need to be replaced every 30 days since they have a low particle-trapping capacity.

  • Pleated Filters: Higher-quality filters that can last between 60 to 90 days but may need more frequent replacement in high-traffic homes.

  • High-Efficiency Filters (HEPA): These filters offer excellent filtration and can last up to 6 months but may require monitoring to prevent clogging.


HVAC

How to Know It’s Time to Change the Filter


Even if you follow a schedule, there are signs that your filter may need to be replaced sooner. 


Look out for the following indicators:


  • Visible dirt or discoloration on the filter

  • Increased dust buildup on furniture and surfaces

  • The HVAC system takes longer to heat or cool your home

  • A sudden increase in energy bills

  • Unusual noises from the system, such as rattling or humming


If you notice any of these signs, it’s best to change the filter immediately, even if you are ahead of schedule.


How to Change Your HVAC Filter


Changing the filter is a simple task that most homeowners can do without professional help. 


Here’s how:


  • Turn off the HVAC system to prevent dust from circulating.

  • Locate the filter—it’s usually near the return air duct or inside the blower compartment.

  • Remove the old filter and dispose of it.

  • Insert the new filter, ensuring the arrows on the frame point toward the airflow.

  • Turn the system back on and check for smooth operation.


Changing your HVAC filter on a regular schedule ensures your system works efficiently, your energy bills stay manageable, and your home’s air quality remains high. While a general rule is to replace filters every 1 to 3 months, factors like pets, allergies, and system usage can affect the timing. Monitoring your filter’s condition and replacing it as needed will keep your HVAC system running smoothly for years to come.


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