Picking the Right Air Filter for Your HVAC System

Keeping clean, healthy indoor air is a top priority for comfort-minded homeowners and using the right HVAC air filter plays a big part in providing it. Use this guide to help you select the perfect filter type, dimensions and overall filtration efficiency rating for your home’s indoor air quality needs. 

What Is the Best Time to Change Your Air Filter? 

The first thing to to think about is when to replace the filter. The standard industry advice for standard residential filters is to replace them every 90 days for the typical home without pets. If you have a four-legged companion, shorten this to every 60 days. For homes with many pets or family members with allergies, your schedule should be as often as every 30 days. 

Choosing the Correct Air Filter Size 

Not all heating and cooling systems are the same, so manufacturers make air filters to fit various slots. Only using the correct size provides a tight seal without allowing air to bypass the filter. Here are three easy ways for you to identify the right filter size: 

  • Check the current filter for a label listing the dimensions. 
  • Measure the filter slot. Measure the height, width and depth so there’s a perfect fit without forcing the filter into the opening. 
  • Consult the HVAC manual, which should specify the filter size and type recommended for your system. 

Varieties of HVAC Air Filters 

Several filter materials and designs are all offering air quality improvements, and each is tailored to different needs. Here are some common types: 

  • Fiberglass filters are the most straightforward and economical option. Made from layered fiberglass strands, they help trap larger particles that could settle on the equipment. However, they don’t filter small particles that are harmful to breathe, so don’t count on them to deliver top-of-the-line indoor air quality. 
  • Pleated filters made from polyester or cotton folds offer a bigger surface area to trap smaller particles. 
  • Electrostatic filters implement self-charging fibers to collect airborne particles. They come in both single-use and washable forms. 
  • HEPA filters offer impressive filtration. However, because they severely limit airflow, they are usually reserved for medical facilities, clean rooms and other commercial industries. If you want to use a HEPA filter in your residential HVAC system, work with a heating and cooling technician to determine compatibility. 

Air Filter MERV Ratings 

Minimum efficiency reporting value, or MERV, is the scale used to measure air filter effectiveness. Ratings range from 1 to 20, with higher numbers demonstrating a filter’s ability to capture increasingly finer particles. 

  • MERV 1-4 represent the most basic filters, capable of capturing large particles like dust, pollen, lint and carpet fibers. They are meant for limited filtration but are budget-friendly for simple applications without pets or allergies. 
  • MERV 5-8 are ideal for homes and commercial buildings where pet dander, mold spores, pollen and dusting aids need more constant handling. They strike a balance between cost and filtration equally, making them a common selection among homeowners. 
  • MERV 9-12 are designed for filters that can help with legionella, humidifier dust, auto emissions and more. They provide improved air quality to help minimize allergies or mild asthma symptoms. 
  • MERV 13-16 are considered some of the very best filters for residential use. They’re found in hospitals and other healthcare settings where clean and healthy air is necessary. These designs trap bacteria, tobacco smoke and even some virus particles. 
  • MERV 17-20 are reserved for HEPA filters, which trap at least 99.97% of particles down to 0.3 microns in size, like lead dust, humidifier dust, asbestos fibers and other ultrafine particles. 

How to Make Your Selection 

When figuring out which type is the right home air filter, don’t forget about these factors: 

  • Household needs: Those with pets, people with allergies or asthma, and homes in dusty or high-pollution environments may benefit from a filter with a stronger MERV rating. 
  • System compatibility: Before upgrading to a filter above MERV 12, verify that your HVAC system can handle it without restricting airflow. 
  • Filter thickness: 4- to 5-inch-thick filters usually work longer and provide more consistent filtration than standard 1-inch filters. Ensure your system is compatible. 
  • Cost vs. benefits: Premium filters are more expensive but need replacement less often and provide better air quality. Calculate the potential long-term savings and health benefits before you decide. 
  • HVAC professional’s advice: The best way to feel confident in your decision is to schedule a consultation with an HVAC technician who can offer trusted advice based on your home’s system and air quality requirements. 

Breathe Your Best with Service Experts Heating & Air Conditioning 

If you’re looking for a better air filter, let Service Experts Heating & Air Conditioning assist you in making the perfect selection. Our air filtration system installation service will protect your HVAC equipment and relieve asthma and allergy symptoms. We take pride in enhancing your life and comfort through our customized, professional services. For assistance with choosing the right air filter or other HVAC needs, please contact Service Experts Heating & Air Conditioning today. 

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