Ever wondered why HVAC technicians seem obsessed with air filters? They constantly remind you to replace them, but the importance of this task often gets overlooked.
Changing your air filter in your home often is important. It helps your system run well. It also keeps your indoor air clean. Plus, it can save you money on energy bills.
If you’re unsure about how often to replace your AC filter, this guide breaks it all down – from filter types to the factors that influence replacement schedules.
Key Takeaways
- Fiberglass filters need replacement every 30 days.
- Pleated filters last up to 90 days but are more expensive.
- Replacement frequency depends on home size, pets, allergies, outdoor air quality, and HVAC usage.
- Seasonal changes affect how filters perform and when they should be replaced.
- Neglecting HVAC air filters can cause poor air quality, higher energy bills, and system breakdowns.
Air Filters 101
Air filters have two main jobs. They protect your HVAC system from dirt and help clean the air you breathe. They filter out particles such as dust, mold, and bacteria.
Two main types of filters exist: fiberglass and pleated. Let’s talk about them…
Fiberglass Filters
Fiberglass filters are the most budget-friendly option. They capture larger particles like dust and dirt but lack the efficiency to trap smaller contaminants. Because they clog quickly, these filters need to be replaced every 30 days.
Pleated Filters
Pleated filters are a step up in quality and efficiency. They’re made from denser materials, allowing them to trap smaller particles such as allergens, pet dander, and mold spores.
They cost more than fiberglass filters but last up to 90 days, making them a popular choice for homes with pets or allergy sufferers.
Pro Tip: If you find it hard to remember to buy and change filters, try a filter subscription service. They will deliver replacements to your door regularly.
What Is a MERV Rating and Why Does It Matter?
MERV ratings are a standard measure of how well an air filter captures airborne particles. Filters are rated on a scale from 1 to 16:
- Low MERV Ratings (1–6): Suitable for trapping larger particles like dust and lint. These are best for homes with minimal filtration needs.
- Moderate MERV Ratings (7–12): Capture smaller particles, such as pollen, mold spores, and pet dander. These are ideal for most residential systems.
- High MERV Ratings (13–16): Commonly used in hospitals and commercial buildings, they trap the smallest particles, including bacteria and smoke.
While higher MERV ratings provide better filtration, using a filter with a rating too high for your system can restrict airflow, reducing efficiency and potentially damaging your HVAC unit. Always check your HVAC manual for recommended ratings.
How Often Should You Replace Your Air Filter?
The frequency of replacement depends on several factors specific to your home and lifestyle.
Home Size
- Larger homes: More air circulates through the HVAC system, which can clog filters faster.
- Smaller homes: Require less frequent replacements, but smaller filters may still need regular attention.
Occupancy
- Low occupancy: Vacation homes can go 9–12 months between filter changes.
- High occupancy: The more people in your home, the more dust, hair, and particles the filter traps. Replace filters every 30–60 days.
Outdoor Air Quality
- Urban areas: Pollution and smog clog filters faster, requiring frequent replacements.
- Wildfire regions: Poor air quality events necessitate immediate inspection and possible replacement.
Allergies
- Allergy sufferers benefit from replacing filters every 20–45 days. This reduces allergens like pollen and dust, improving air quality and easing symptoms like sneezing or congestion.
Pets
- Homes with pets need more frequent filter changes due to pet hair and dander. Replace filters every 20–60 days, depending on the number and type of pets.
Seasonal Changes
- Spring and Fall: HVAC systems often run less, but open windows introduce pollen, dust, and other outdoor contaminants. Check filters monthly during these seasons.
- Summer and Winter: Heating and cooling systems work harder during extreme weather, causing filters to clog more quickly. The general rule of thumb is to replace filters every 30–90 days.
Pro Tip: Use the “ON” fan setting during mild seasons to keep air circulating through the filter, even when the HVAC system isn’t actively heating or cooling.
Why You Shouldn’t Neglect Air Filter Replacement
Failing to replace air filters can lead to costly and avoidable issues.
- Reduced System Performance: A clogged filter restricts airflow, forcing your air conditioner to work harder and increasing energy costs.
- System Breakdowns: Dust and debris can damage essential components like motors and valves, leading to expensive repairs or replacements.
- Poor Indoor Air Quality: Dirty filters allow allergens, mold, and bacteria to circulate, affecting your health and comfort.
Regular maintenance keeps your air conditioning system efficient and extends its lifespan.
Tips for Inspecting and Replacing Filters
Simple habits can make air filter maintenance easier.
- Monthly Inspections: Check filters visually every month.
- Light Test: Hold the filter up to a light source. If light doesn’t pass through, it’s time to replace it.
- Monitor Changes: Adjust replacement frequency based on new pets, allergy seasons, or local air quality issues.
- Experiment: Test different intervals to find the best replacement schedule for your home.
Benefits of regular filter replacements include lower energy bills, improved air quality, and fewer HVAC repairs.
Choosing the Right Air Filter
Selecting the right air filter ensures your HVAC system works efficiently.
- Correct Size: Check your HVAC system manual or the dimensions of your current filter.
- Pleated Filters: These offer better durability and filtration than fiberglass filters.
- Specific Needs: Consider allergies, pets, and local air quality when selecting a filter.
- Filter Location: Identify the filter slot in your furnace, air handler, or return air duct to ensure proper placement.
Get Professional Maintenance for Long-Term AC Health
One Hour provides professional air conditioner maintenance to keep your system running efficiently. From filter replacements to system checks, we handle everything to ensure your home stays comfortable. Schedule regular service to extend the lifespan of your HVAC system and maintain clean indoor air.
We proudly serve Orlando, FL, and surrounding areas, with our guarantee: “We’re always on time or you don’t pay a dime.”
FAQs
What is the purpose of an AC filter?
AC filters trap dust, pet dander, mold spores, and other particles to improve indoor air quality and protect your HVAC system.
How do I know when to replace my filter?
Perform a visual check monthly. If the filter appears dirty or light doesn’t pass through, it’s time for a replacement.
Can I clean and reuse my filter?
Only reusable filters can be cleaned. Disposable filters must be replaced entirely.
What happens if I forget to replace the filter?
Neglecting to replace filters reduces airflow, decreases system efficiency, and increases the risk of breakdowns.
Final Thoughts
Replacing your AC filter is a small task with big benefits. It improves air quality, reduces energy bills, and protects your HVAC system. By understanding your home’s unique needs, you can create a filter replacement schedule that works for you.
For professional HVAC services, contact One Hour. We’ll handle filter replacements, system checks, and more to keep your home comfortable year-round.