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What You Need to Know About Furnace Air Filters
Posted On: February 1, 2025
Here’s an informative overview of what you need to know about furnace air filters:
What Are Furnace Air Filters?
Furnace air filters are essential components of your heating, ventilation, and air conditioning (HVAC) system. They trap dust, dirt, pet dander, and other airborne particles, preventing them from circulating throughout your home.
Why Are Furnace Air Filters Important?
- Improved Air Quality – Filters remove allergens and pollutants, making indoor air healthier.
- Protects HVAC System – A clean filter prevents dust buildup in the furnace, which can cause overheating and damage.
- Energy Efficiency – A clogged filter makes your furnace work harder, leading to higher energy bills.
- Extends Equipment Lifespan – Regularly changing filters reduces wear and tear on your HVAC system.
Types of Furnace Air Filters
- Fiberglass Filters – Low-cost, disposable filters that provide basic filtration but need frequent replacement.
- Pleated Filters – Made of polyester or cotton, these offer better filtration and last longer.
- Electrostatic Filters – Use static electricity to capture particles, available in disposable or washable versions.
- HEPA Filters – High-efficiency filters that trap 99.97% of small particles, ideal for allergy sufferers.
- Activated Carbon Filters – Help remove odors, smoke, and chemicals in addition to dust and debris.
Choosing the Right Filter
Filters are rated using the Minimum Efficiency Reporting Value (MERV) scale (1-20):
- MERV 1-4 – Basic filtration (low-cost but ineffective for small particles).
- MERV 5-8 – Good for residential use, capturing dust mites, mold spores, and pet dander.
- MERV 9-12 – Superior filtration, effective for people with allergies or respiratory issues.
- MERV 13-20 – Used in hospitals and clean rooms, may restrict airflow in standard furnaces.
How Often Should You Change the Filter?
- Basic fiberglass filters – Every 30 days.
- Pleated and electrostatic filters – Every 60-90 days.
- HEPA and high-efficiency filters – Every 6-12 months (depending on usage).
- Homes with pets or allergies – Change filters more frequently.
Signs It’s Time to Replace Your Furnace Filter
- Reduced airflow from vents
- Increased dust buildup in your home
- Higher energy bills
- Strange odors from vents
- Allergy symptoms worsening
Final Tips
- Check your filter monthly and replace it as needed.
- Choose a filter with the right MERV rating for your home and HVAC system.
- If unsure, consult your furnace manual or an HVAC professional.
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See What Our Customers Are Saying:
Jan 1, 2015
My old furnace had finally broken down for the last time when contacted twintech to have a new furnace installed They were prompt, knowledgeable and very reasonably priced. They did such a great job i tell all my friends and family about this company.
Jan 1, 2015
To whom it may concern, I recently had TwinTech (Greg and Grant Dainty) replace my furnace and service both my gas fireplaces and air conditioning unit. They were professional, courteous and very fair in their pricing. I would gladly recommend TwinTech to anyone needing work done. I can be contacted at 905-626-XXXX.
Jan 1, 2015
My Fiancé and I have relied on Twintech Heating and Cooling now for the better part of the last 10 years. In that time, Greg has installed a furnace, an air conditioner, and a heat-pump at our residence in Toronto. In each instance Greg and his team were a pleasure to deal with. They were courteous and professional throughout the whole process and the quality of their work is first rate. Our experiences have always been extremely positive and we have referred his services numerous times to our friends and family. Without hesitation, I would recommend Greg and TwinTech Heating and Cooling to anyone looking to service or replace their existing heat/AC equipment
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