Selecting the Ideal Air Filter for Your HVAC System

Keeping clean, pure indoor air is a top priority for many homeowners and using the correct HVAC air filter plays a crucial role in providing it. Take a look at this guide to find the perfect filter kind, size and MERV rating for your home’s indoor air quality needs. 

What Is the Best Time to Change Your Air Filter? 

The first thing to consider is when to replace the filter. The general recommendation for everyday residential filters is to replace them every 90 days for the average home without pets. If you have a pet, increase this to every 60 days. For homes with many pets or family members with allergies, you might want to replace the filter as often as every 30 days. 

Picking the Correct Air Filter Size 

Not all home comfort systems are built the same, so different companies make air filters to fit different-sized slots. Buying the correct size provides a snug fit without any gaps large enough for air to slip past the filter. Here are three ways to determine the best filter size: 

• Check the current filter for a label listing the dimensions. 

• Compare this with the filter slot. Confirm the height, width and depth to ensure a tight seal without forcing the filter into the opening. 

• Refer to the HVAC manual, which should indicate the filter size and type best suited for your system. 

Types of HVAC Air Filters 

Different filter materials and designs are all offering air quality improvements, and each is designed for different needs. Here are some popular types: 

• Fiberglass filters are the simplest and cost-effective option. Made from layered fiberglass strands, they trap larger particles that could damage the equipment. However, they don’t filter small particles that can be an issue for people with respiratory problems, so don’t count on them to deliver top-of-the-line indoor air quality. 

• Pleated filters using polyester or cotton folds offer a larger surface area to trap smaller particles. 

• Electrostatic filters use self-charging fibers to capture and hold airborne particles. They come in both single-use and washable forms. 

• HEPA filters offer remarkable filtration. However, because they drastically restrict airflow, they are usually installed in medical facilities, clean rooms and other commercial applications. If you want to use a HEPA filter in your residential HVAC system, work with a heating and cooling technician to determine compatibility. 

Comparing Air Filters with MERV Ratings 

Minimum efficiency reporting value, or MERV, is the system used to assess air filter performance. Ratings range from 1 to 20, with high numbers indicating a filter’s ability to capture finer particles. 

• MERV 1-4 describe the simplest of filters, capable of capturing large particles such as pet dander, pollen, lint and carpet fibers. They are meant for basic filtration but are a solid and economical choice for simple applications without pets or allergies. 

• MERV 5-8 are better suited for homes and commercial buildings where pet dander, mold spores, pollen and dusting aids need more constant handling. They balance cost and filtration for average needs, making them a popular choice among homeowners. 

• MERV 9-12 apply to filters that can trap legionella, humidifier dust, auto emissions and more. They provide superior air quality to help relieve allergies or mild asthma symptoms. 

• MERV 13-16 are viewed as top-of-the-line filters for residential use. They’re found in hospitals and similar commercial properties where clean air is necessary. You can use these filters to trap bacteria, tobacco smoke and even some virus particles. 

• MERV 17-20 ratings are exclusive to HEPA filters, capable of trapping roughly 99.97% of particles down to 0.3 microns in size, like lead dust, humidifier dust, asbestos fibers and other ultrafine particles. 

Tips for Making Your Selection 

When deciding on the ideal 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 be better from using a filter with a stronger MERV rating. 

• System compatibility: Before upgrading to a filter above MERV 12, verify that your HVAC system can accommodate the higher MERV rating without compromising airflow. 

• Filter thickness: 4- to 5-inch-thick filters generally last longer and offer stronger filtration than standard 1-inch filters. Just make sure your system is compatible. 

• Cost vs. benefits: Premium filters have a higher initial price tag but need to be replaced less often and provide healthier indoor air quality. Calculate the potential long-term savings and health benefits before you make your decision. 

• HVAC professional’s advice: The safest approach to make an informed decision is to schedule a consultation with an HVAC technician offering expert advice based on your home’s system and air quality requirements. 

Breathe Easier with Bryant Heating & Cooling Service Experts 

If you’re looking for a better air filter, let Bryant Heating & Cooling Service Experts guide you to the right selection. We can install high-efficiency air filtration systems to better protect your HVAC equipment and minimize asthma and allergy symptoms. We take pride in improving the health of your life and comfort through our customized, professional services. For assistance with picking the right air filter or other HVAC needs, please contact Bryant Heating & Cooling Service Experts today.