10 Best HEPA Air Conditioning Filters 2025 in the United States

The Filtrete 24x24x1 AC Furnace Air Filter is designed to improve indoor air quality by capturing a wide range of airborne particles. It carries a MERV 11 rating, which means it can trap medium-sized particles like dust, pollen, mold spores, and pet dander effectively, making it suitable for most residential HVAC systems. While it does not have a true HEPA rating, its MERV 11 rating balances filtration and airflow to help your heating or cooling system operate efficiently without being overly restrictive.

The filter size is slightly smaller than the nominal 24x24x1 inches at 23.81 x 23.81 x 0.81 inches, so it’s important to confirm compatibility with your specific furnace or air conditioner slot. Its pleated design with polypropylene material and electrostatic properties helps pull in and trap particles better than a basic flat filter. Replacement every three months is recommended to maintain good performance, and the product comes in a convenient 2-pack, with subscription options for regular deliveries to simplify upkeep.

This Filtrete filter is a reliable choice for improving home air quality by capturing common allergens and particles. It is easy to use, widely trusted, and offers good value with a two-pack, making it well suited for general household air cleaning rather than specialized medical-grade filtration needs.

The Aerostar 20x20x1 MERV 13 air filter is a solid choice for those wanting to improve indoor air quality in their HVAC systems. With a MERV 13 rating, it efficiently traps tiny particles like dust, pollen, pet dander, smoke, bacteria, and even some viruses—making it suitable for allergy sufferers and anyone concerned with cleaner air. The filter uses a pleated synthetic material that balances good filtration with low airflow resistance, so your air system won’t have to work too hard.

It comes in a standard 20x20 inch size (actual size slightly smaller to fit most units) and includes six filters, which is convenient and cost-effective. Changing the filter every 60 to 90 days is recommended, or more often during heavy use seasons, to keep performance optimal. This filter is not a true HEPA filter, but its MERV 13 rating still offers strong filtration for typical home use. While it filters many common airborne particles, it won’t capture 100% of the smallest allergens or ultrafine particles like a HEPA filter might.

Aerostar’s filter provides a user-friendly, affordable option for improving air cleanliness in furnaces and air conditioners, especially for households dealing with allergies, pets, or pollution.

The AprilAire 213 Replacement Filter is designed for whole-house air purifiers and features a MERV 13 rating, which effectively captures many common allergens such as dust, pollen, pet dander, and mold spores. Although it is not a HEPA filter, its MERV 13 rating provides strong filtration for improved indoor air quality, making it suitable for those with allergies. A notable feature is the patented Self-Seal Technology, which ensures that air passes through the filter rather than around it, enhancing filtration effectiveness.

Installation is straightforward with AprilAire's Interlock Rail System, requiring no extra tools or parts. The filter measures 20x25x4 inches and fits specific AprilAire models only, so it is important to confirm compatibility with your purifier. Manufactured in the USA, the filter supports lung health initiatives, which may appeal to users who prioritize product origin and mission.

The filter's weight and pleated polyester construction are standard and do not suggest an exceptionally long lifespan; therefore, periodic replacement is necessary to maintain performance. Since it is designed exclusively for certain AprilAire units, it is not a universal fit, limiting its use with other brands. This filter is a reliable, allergy-focused replacement for compatible AprilAire purifiers, but those seeking true HEPA-level filtration or a universal fit may want to consider other options.