Picking the Right Air Filter for Your HVAC System

Ensuring clean, healthy indoor air is a top priority for many homeowners and using the correct HVAC air filter plays a big part in providing it. Take a look at this guide to figure out the perfect filter kind, size and overall filtration efficiency rating for your home’s indoor air quality needs. 

How Often Should You Change Your Air Filter? 

The first thing to to determine is the frequency you need to replace the filter. The most common suggestion for everyday residential filters is to replace them every 90 days for the standard home without pets. If you have a four-legged companion, increase this to every other month. For homes with many pets or family members with allergies, change the filter as often as every 30 days. 

Picking the Correct Air Filter Size 

Not all HVAC systems are built the same, so major brands make air filters to fit multiple kinds of filter slots. Buying the correct size ensures a perfect fit without any gaps large enough for air to slip past the filter. Here are three easy ways for you to determine the perfect filter size: 

• Check the filter already in place for a label detailing the dimensions. 

• Take measurements of the filter slot. Measure the height, width and depth for a snug fit without forcing the filter into the opening. 

• Consult the HVAC manual, which should specify the filter size and type advised for your system. 

Types of HVAC Air Filters 

Various filter materials and designs are on the market, and each is designed for different needs. Here are some common types: 

• Fiberglass filters are the most straightforward and affordable option. Made from stacked fiberglass strands, they help trap larger particles that could settle on the equipment. However, they don’t filter small particles which can be detrimental to health, 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 finer particles. 

• Electrostatic filters employ 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 significantly reduce airflow, they are usually reserved for medical facilities, clean rooms and other commercial applications. If you would like 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 standard used to measure air filter efficiency. Ratings range from 1 to 20, with high numbers signifying a filter’s ability to trap very fine particles. 

• MERV 1-4 are for the most basic filters, helpful for large particles such as pet dander, pollen, lint and carpet fibers. They are meant for minimal filtration but are budget-friendly 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 strike a balance between cost and filtration equally, making them a common selection among homeowners. 

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

• MERV 13-16 are seen as some of the very best filters for residential use. They’re also often used in hospitals and other healthcare settings where pure air is necessary. These designs trap bacteria, tobacco smoke and even a few virus particles. 

• MERV 17-20 ratings are mostly found in HEPA filters, which capture roughly 99.97% of particles down to 0.3 microns in size, including lead dust, humidifier dust, asbestos fibers and other microscopic particles. 

Tips for Making Your Selection 

When deciding on the right home air filter, focus on 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 greater MERV rating. 

• System compatibility: Before you go out and buy a filter with a rating of MERV 12, check if your HVAC system can accommodate the higher MERV rating without compromising airflow. 

• Filter thickness: 4- to 5-inch-thick filters tend to last you longer and offer stronger filtration than standard 1-inch filters. Just make sure 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 most reliable method to make an informed decision is to schedule a consultation with an HVAC technician who can offer reliable advice based on your home’s system and air quality goals. 

Breathe Easier with Service Experts Heating & Air Conditioning 

When you’re ready for a better air filter, let Service Experts Heating & Air Conditioning guide you to the perfect selection. We can install high-efficiency air filtration systems to better protect your HVAC equipment and alleviate asthma and allergy symptoms. We take pride in making a meaningful difference in your life and comfort thanks to our tailored, professional services. For assistance with picking the right air filter or other HVAC needs, please contact Service Experts Heating & Air Conditioning today.