10 Best Furnace Filters 2025 in the United States

The Filterbuy 16x25x1 Air Filter MERV 8 Dust Defense is a solid choice for general home use in furnaces, air conditioners, and HVAC systems. Its actual size of 15.5 x 24.5 x 0.75 inches fits standard filter slots well. With a MERV 8 rating, it effectively captures common airborne irritants like mold spores, pollen, and dust, filtering about 90% of dust particles. This level is good for improving indoor air quality without restricting airflow, which is important for efficient system operation.

The filter's material includes synthetic polypropylene with an electrostatic charge and 14 pleats per foot, making it better at trapping particles than plain fiberglass filters. It’s designed to last about 90 days, or roughly three months, before replacement, which is typical for filters in this category. The frame is stronger than standard cardboard, being made of beverage board with dual wire backing, which means it holds up well even under temperature changes and won’t easily bend or break. Being made in the USA with recyclable materials is a plus for those concerned about quality and environmental impact.

A MERV 8 filter won’t catch the tiniest particles like smoke or some bacteria, so it might not be the best choice if very high filtration is needed. This filter provides a dependable, easy-to-install option for users wanting a good balance between air cleanliness and system efficiency, especially if used as recommended every three months.

The Filtrete 16x20x1 AC Furnace Air Filter is designed to efficiently capture unwanted particles, making it a solid choice for residential use. With a MERV rating of 5, it effectively attracts larger particles like lint and household dust, enhancing air quality. One of its standout features is the 3M technology that allows for better airflow while trapping these particles, leading to improved heating and cooling system performance. The filters come in a convenient 6-pack, which is great for those who prefer to stock up and change filters every three months.

A major advantage of these filters is their ease of use; they are designed to be replaced every 90 days and can be monitored through the Filtrete Smart app that sends reminders when it's time for a change. This feature helps ensure optimal performance and energy efficiency by preventing airflow restrictions due to dirty filters.

There are a few drawbacks to consider. The MERV 5 rating, while sufficient for capturing larger particles, may not be ideal for households with allergy sufferers or those wanting to filter out smaller particulates like pollen or smoke. Additionally, the filters are not washable, meaning they need to be replaced regularly, which could be a concern for users looking for more sustainable options.

The Filtrete 20x25x1 AC Furnace Air Filter comes as a 2-pack designed to clean the air in your home by capturing tiny particles such as allergens and dust. Its actual size is slightly smaller than the standard 20x25x1, measuring about 19.7 x 24.7 x 0.8 inches, so it's important to ensure your furnace or AC can accommodate this size for a proper fit. It features a MERV 11 rating, which means it is quite effective at trapping small particles like pollen, pet dander, and mold spores, making it a good choice if you’re looking to improve your indoor air quality without going for the highest filtration levels that can sometimes strain your system.

The filter is made from polypropylene, a common durable material for furnace filters. It uses electrostatic pleated technology, which helps attract and trap particles more efficiently. The recommended lifespan is about 3 months, so you should plan on replacing the filters seasonally to maintain good airflow and filtration performance. One advantage is that this pack contains two filters, offering convenience and some savings.

Filtrete is a trusted brand. However, the slightly off-standard size could be an issue for some systems, and a MERV 11 filter may not capture the tiniest particles like viruses or some bacteria if that is a priority for you. Also, frequent replacement every three months means ongoing costs and a bit of maintenance. This Filtrete filter is suitable for homeowners wanting solid air cleaning for common household allergens and dust, with easy installation and trusted brand support, but you should double-check the exact filter size and be prepared to replace it seasonally.