Selecting the Perfect Air Filter for Your HVAC System
Maintaining clean, pure indoor air is a top priority for most homeowners and using the correct HVAC air filter plays a big part in providing it. Use this guide to figure out the right 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 determine is the frequency you need to replace the filter. The most common suggestion for standard residential filters is to replace them every 90 days for the average home without pets. If you have a four-legged companion, increase this to every 60 days. For homes with multiple pets or family members with allergies, your schedule should be as often as every 30 days.
Selecting the Right Air Filter Size
Not all home comfort systems are the same, so manufacturers make air filters to fit various slots. Only using the correct size provides a perfect fit without air leaking past the filter. Here are three easy ways for you to determine the perfect filter size:
- Examine the existing filter for a label detailing the dimensions.
- Take measurements of the filter slot. Confirm the height, width and depth so there’s a perfect fit without forcing the filter into the opening.
- Look in the HVAC manual, which should mention the filter size and type advised for your system.
Varieties of HVAC Air Filters
Various filter materials and designs are available, and each is tailored to different needs. Here are some popular types:
- Fiberglass filters are the most basic and cost-effective option. Made from layered fiberglass strands, they 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 industrial-grade indoor air quality.
- Pleated filters fabricated with light 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 disposable and washable forms.
- HEPA filters offer remarkable filtration. However, because they drastically restrict airflow, they are usually reserved for medical facilities, clean rooms and other commercial applications. If you want to use a HEPA filter in your residential HVAC system, collaborate 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 efficiency. Ratings span 1 to 20, with the highest numbers signifying a filter’s ability to collect very fine particles.
- MERV 1-4 represent the common air filters, helping trap large particles like dust, pollen, lint and carpet fibers. They provide limited filtration but are cost-effective for simple applications without pets or allergies.
- MERV 5-8 are recommended for homes and commercial buildings where pet dander, mold spores, pollen and dusting aids need more constant handling. They balance cost and filtration equally, making them a favored option among homeowners.
- MERV 9-12 are designed for filters that can capture legionella, humidifier dust, auto emissions and more. They provide superior air quality to help relieve allergies or mild asthma symptoms.
- MERV 13-16 are considered some of the very best filters for residential use. They’re the standard choice in hospitals and similar commercial properties where clean air is necessary. These filters can capture bacteria, tobacco smoke and even some virus particles.
- MERV 17-20 ratings are exclusive to HEPA filters, capable of trapping at least 99.97% of particles down to 0.3 microns in size, including lead dust, humidifier dust, asbestos fibers and other ultrafine particles.
How to Make Your Selection
When settling on the ideal home air filter, consider these factors:
- Household needs: Pet owners, allergy and asthma sufferers, and homes in areas with high dust or pollution may be better from using a filter with a stronger MERV rating.
- System compatibility: Before you upgrade to a filter with MERV 12, make sure your HVAC system can accommodate the higher MERV rating without compromising airflow.
- Filter thickness: 4- to 5-inch-thick filters generally last longer and provide more consistent filtration than standard 1-inch filters. Verify your system is compatible.
- Cost vs. benefits: High-end filters have a higher initial price tag but need less frequent changing and provide better air quality. Calculate the potential long-term savings and health benefits when deciding.
- HVAC professional’s advice: The safest approach to feel confident in your decision is to consult an HVAC technician who can offer trusted advice based on your home’s system and air quality requirements.
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. 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 personalized, professional services. For assistance with selecting the right air filter or other HVAC needs, please contact Service Experts Heating & Air Conditioning today.