Choosing the Right Air Filter for Your HVAC System

Keeping clean, fresh indoor air is a top priority for comfort-minded homeowners and using the right HVAC air filter plays a significant part in providing it. Use this guide to help you select the ideal filter type, size 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 general recommendation for conventional residential filters is to replace them every 90 days for the average home without pets. If you have a furry friend, shorten this to every 60 days. For homes with multiple pets or family members with allergies, you might want to replace the filter as often as every 30 days. 

Choosing the Right Air Filter Size 

Not all HVAC systems are the same, so manufacturers make air filters to fit multiple kinds of filter slots. Getting the correct size ensures a tight seal without any gaps large enough for air to slip past the filter. Here are a few tips to find out the right filter size: 

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

• Measure the filter slot. Confirm the height, width and depth to ensure a snug fit without forcing the filter into the opening. 

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

Kinds of HVAC Air Filters 

Various filter materials and designs are available, 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 protect the HVAC system from large particles that could settle on 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 industrial-grade indoor air quality. 

• Pleated filters fabricated with light polyester or cotton folds offer a larger surface area to trap finer particles. 

• Electrostatic filters employ self-charging fibers to attract and trap airborne particles. They come in both single-use and reuseable forms. 

• HEPA filters offer exceptional filtration. However, because they severely limit airflow, they are usually reserved for medical facilities, clean rooms and other commercial properties. If you prefer a HEPA filter in your residential HVAC system, work with a heating and cooling technician to determine compatibility. 

The MERV Rating System for Air Filters 

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

• MERV 1-4 represent the simplest of filters, capable of capturing large particles such as pet dander, pollen, lint and carpet fibers. They provide limited filtration but are cost-effective 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 control. They strike a balance between cost and filtration for average needs, making them a favored option among homeowners. 

• MERV 9-12 suit filters that can trap 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 top-of-the-line filters for residential use. They’re also often used in hospitals and other healthcare settings where clean air is necessary. These filters can capture bacteria, tobacco smoke and even certain 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 settling on the right home air filter, consider these factors: 

• Household needs: Those with pets, allergy and asthma sufferers, and homes in areas with high dust or pollution may be better from using a filter with a higher MERV rating. 

• System compatibility: Before you go out and buy a filter with a rating of MERV 12, check if your HVAC system can handle it without restricting airflow. 

• Filter thickness: 4- to 5-inch-thick filters usually work longer and provide better filtration than standard 1-inch filters. Verify your system is capable of using that size filter. 

• Cost vs. benefits: High-end filters are more expensive but need less frequent changing and provide better air quality. Make a rough estimate of the potential long-term savings and health benefits when deciding. 

• HVAC professional’s advice: The most reliable method 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 goals. 

Breathe Better with Service Experts Heating & Air Conditioning 

If you’re looking for a better air filter, let Service Experts Heating & Air Conditioning guide you to the perfect selection. We install various air filtration systems to protect your HVAC equipment and minimize asthma and allergy symptoms. We take pride in enhancing your life and comfort through our tailored, professional services. For assistance with choosing the right air filter or other HVAC needs, please contact Service Experts Heating & Air Conditioning today.