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Why Choose Air Filters Unlimited?

Fast & Free Shipping

Most popular filters ship within

1 business day.

Filters That Actually Fit

Custom and standard

sizes available.

No more trimming or taping.

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Set it and forget it.

Never miss a filter change again.

Top-Tier Quality Made in USA

High Quality Air Filters

Made in the USA

High performance you can trust.

Trusted by Homeowners, Businesses & Property Managers

Great Experience

A/C Filters easy to order. Great product for the money. Extremely fast delivery. What else is there to say? The company and product, as well as shipping all deserve a 5 star rating. Completely satisfied and happy throughout the process.

Cathy / Homeowner

All filters were Glasfloss ZL, Merv 10 which work very well in our buildings. Pricing is the best that I've found anywhere and delivery time, compared to other vendors I've used, is much faster. We service over 500,000 sq. ft. of building space, so air filtration is very important. High quality filters are essential to the health of our students and staff while a good price is important to our budget. Air Filters Unlimited fills both of those needs.

Robert / Commercial Facility

We have purchased for our office

We have purchased our office HVAC filters from Air Filters Unlimited for several years now. Inexpensive and get the job done. Easy to order and arrive quickly. Cannot get much better than that!
Joanne / Office Manager

Filter Options for Every Space

Residential Neighborhood

Residential Filters

Perfect for homeowners who want cleaner air without the hassle.

Commercial Buildings

Commercial Filters

Stock up for offices, retail spaces, industrial spaces, schools, hospitals and high-traffic areas.

Custom Air Filter

Custom Filters

Can’t find your size?

We’ll make it. No compromises on fit or function.

Air Filter FAQ

This will depend on each individua home. Factors to consider are how many people are living in the home, how many pets are inthe home, is your home in the city or rural. We have a page dedicated to this question and how to know when it’s time to change your air filter. Check it out here! Air Filter Change Frequency

Installing your new filter is easy in most cases. It will go right back where the old one was. The most common mistake made is putting the filter in upside down. Our air filters are marked on the sides with arrows. These arrows need to be pointing in the direction of the air flow, or toward the indoor unit. Our pleated filters have an expanded metal backing on one side to help support the filter media while the air is moving through it.

There are a few reasons you should change your air filter regularly. First, to protect your HVAC equipment. Dirty filters can cause serious damage to your equipment that can be very costly and it’s totally avoidable. Second, to protect the indoor air quality (IAQ) of your home. Pleated air filters can remove many allergens from the air that passes through them sparing you and your family from seasonal allergy symptoms in your home. Lastly, to help reduce your utility costs. Dirty air filters cause your equipment to work harder and use more energy.

AC Filters and Furnace Filters are the same thing. Think of it like a regional term. In colder areas they are more often referred to as Furnace Filter and in warmer areas, AC Filters.

Actual size is exactly what is sounds like, the actual size of the air filter. This is usually a fractional size slightly smaller than what is printed on the filter itself. Nominal size is the actual size of the filter rounded up to the nearest inch to standardize how they are labeled and searched for (just like lumber dimensions). So a filter with a nominal size of 16x25x1 will actually be a bit smaller, around 15-1/2 x 24-1/2 x 7/8 in the case of a Glasfloss brand air filter. One exception is with replacement filters for Whole House Air Cleaners. These can sometimes have an actual size that is larger than the nominal size, so it is important to measure these filters when purchasing a replacement to insure you are ordering the correct filter size. If you need assistance in selecting the correct size just contact us and we will be happy to help.

Many of our filters will ship within 1-2 business days but some do take longer. Please note the “Lead Time” section on each product page for the estimated lead time to ship.

MERV is an acronym for Minimum Efficiency Reporting Values

We offer coupons and monthly sales for subscribers to our newsletter that is full of discounts and great information on indoor air quality and topics relative to your heating and air conditioning needs and questions. You can sign up for our newsletter below.

If you can’t find the size you need in our catalog, please contact us with the exact dimensions of the filter you are looking for and we will be happy to help you find them. If your size is not a standard size, we can custom build the filter you need!