14x24x1 Air Filters

TL;DR

A 14x24x1 air filter is a one-inch pleated HVAC filter, and its actual cut measures 13 3/8" x 23 3/8" x 3/4". It fits standard residential furnaces, air conditioners and central air handlers, and since those share one air handler in most homes, a single filter covers heating and cooling both. Filterbuy makes this size in MERV 8, MERV 11, MERV 13 and Odor Eliminator, cut, pleated and framed to order in our own US plants, with fast and free 2-day delivery to most US states.

Key Takeaways

• The actual cut of a 14x24x1 is 13 3/8" x 23 3/8" x 3/4". Nominal size is the ordering name, and that clearance is what makes the filter fit.

• Furnace filter, AC filter, HVAC filter, house filter, central air filter: they’re all the same product, and one of them covers heating and cooling.

• MERV 8 is the standard choice for most homes. MERV 11 is for allergies and asthma, and for pets and pollen. MERV 13 is the one for smoke.

• Check your HVAC manual for filter compatibility, the same quick check you’d do on the size.

• Replace every 90 days in a standard home, 60 with pets, 45 with allergies.

What Size Is A 14x24x1 Air Filter?

Finding your size takes about a minute. Pull the old filter out and read the size printed along its long edge. If there’s no filter in the slot, measure the opening instead and round up to the nearest inch. Don’t see your size listed? We cut custom filters to the eighth of an inch.

A Filterbuy 14x24x1’s actual cut is 13 3/8" x 23 3/8" x 3/4". The nominal size, 14 x 24 x 1, is the ordering name. The cut comes in smaller by design, and that clearance is what lets the filter slide into the slot and seat against it. Measure 13 3/8 inches on your old filter and you’ve found a 14x24x1.

Is Every 14x24x1 Filter The Same Size?

No. Every manufacturer sets its own clearance, and across this size the spread runs to about a third of an inch. Here’s what Filterbuy and the other major brands publish for a 14x24x1, so you can check before you switch.

Actual Cut By Brand

Actual sizes as published by each manufacturer, August 2026. Undercut is the difference from the 14 x 24 nominal size on the long and short edges.

These numbers matter most if you’re moving between brands. Read the actual cut printed on any frame before you order, and if a filter you buy from Filterbuy doesn’t fit, we’ll send you the right size.

You’ll find this size most often in mid-sized residential central air and in return grilles cut to a 14 by 24 opening, including Carrier and Bryant furnaces from the 1990s and 2000s, some Goodman air handlers, various York models and older split systems. Filterbuy filters are compatible replacements for these brands. We’re an independent manufacturer and aren’t affiliated with or endorsed by any of them.

Is A 14x24x1 Furnace Filter The Same As An AC Filter?

Yes. A 14x24x1 furnace filter, air conditioner filter, HVAC filter, house air filter and central air filter are all the same product. In a typical home the furnace and air conditioner share one air handler and one return duct, so one filter serves both. Only the name changes with the season.

Three things decide whether a Filterbuy 14x24x1 fits:

1. Nominal size, which is 14 x 24 x 1
   

2. Depth, one inch here, since a 2-inch or 4-inch filter won’t seat in a 1-inch slot
   

3. MERV rating, either 8, 11 or 13
   
   

Ductless mini-splits and window units are the exception. They don’t take pleated filters at all, and the EPA notes these units are built for temperature control instead of filtration.

Which MERV Rating Should You Choose For A 14x24x1 Filter?

MERV 8 is the standard choice for most homes. Step up to MERV 11 for allergies and asthma, or for pets and pollen. Choose MERV 13 for smoke. Filterbuy Odor Eliminator adds an activated carbon layer that handles odors. All four fit the same 14x24x1 slot, so this comes down to filtration alone.

MERV stands for Minimum Efficiency Reporting Value, the industry scale set by ASHRAE that tells you how much a filter captures. Higher numbers capture more.

The Filterbuy Ladder

MPR is a 3M rating system and FPR is used by The Home Depot. Neither is ours. Odor Eliminator adds an activated carbon layer for odors.

Before you order, check your HVAC manual for filter compatibility. It’s a quick check, the same as confirming your size. The EPA recommends choosing a filter rated at least MERV 13 for home heating and cooling systems.

Where Can You Buy 14x24x1 Air Filters Near You?

Most hardware stores don’t stock 14x24x1, so ordering direct is usually the quickest route. A big-box aisle carries 10 to 15 of the highest-volume sizes, and this one doesn’t make the shelf. That’s a shelf-space decision, and it has nothing to do with how many homes use the size.

You have three realistic options:

1. Direct from Filterbuy. Every rating in stock, with fast and free 2-day delivery to most US states, from $6.66 a filter. Add Auto Delivery and replacements show up on schedule at 5% off.

2. Same-day pickup at select retailers. Filterbuy sells and ships multipacks through Walmart and Target, and both offer same-day pickup in many markets. Check local stock first.

3. A special order through a local HVAC contractor. Handy if you’ve already booked service, though it’s the priciest way to buy.

One thing to skip: don’t substitute a 14x25x1 or a 16x24x1. EPA guidance is to make sure the filter fits snugly so air doesn’t leak around it, and a one-inch gap lets unfiltered air slip past the media and carry dust onto your evaporator coil.

What Do 14x24x1 Air Filters Cost?

A single Filterbuy 14x24x1 costs $22.99, and six-packs bring that to $6.66 each, a 71% saving with free shipping and no membership. Four filters cover a year at the 90-day interval, and we cut, pleat and frame every one to order in our own US plants.

Quantity Pricing

MERV 8 pricing at four changes per year. Other ratings are priced separately. Free shipping on every order, no membership required.

How Often Should You Change A 14x24x1 Air Filter?

Change a Filterbuy 14x24x1 every 90 days in a standard household, every 60 with a pet and every 45 with allergies. Basement mechanical rooms load faster, so use 60 days there. Filterbuy Auto Delivery can hold whichever interval you pick.

Replacement Schedule

Check monthly regardless: hold it up to a light. If light does not pass through the pleats, replace it.

Which way does the arrow point? Toward the furnace or air handler, the direction the air travels. Note it before you pull the old one out.

Getting more out of the filter you already have

Your filter only cleans the air while the system’s running, and the EPA notes most systems run less than 25 percent of the time in heating and cooling season. On a smoky or high-pollen day, switch the thermostat fan from AUTO to ON. Same filter, several times as much air moving through it. Longer runtime does use more electricity and leaves the air a little less dehumidified, so it works best as a bad-air-day setting.

Two limits are worth knowing. Pleated media captures particles, so cooking odors and VOCs (the gases that come off paints, cleaners and cooking) pass straight through, and only the carbon in Filterbuy Odor Eliminator picks those up. And no filter catches everything, so filtration works alongside good ventilation and keeping sources out of the house in the first place.

Supporting Statistics

Three findings behind the guidance above.

1. A clean filter is the cheapest efficiency upgrade you can make.

• Replacing a dirty filter cuts AC energy use by 5 to 15 percent. (U.S. Department of Energy)

• That makes the 90-day interval a cost decision as well as an air-quality one.

2. Indoor air is the air you breathe most.

• Americans spend about 90 percent of their time indoors. (U.S. EPA)

• Some pollutants run 2 to 5 times higher indoors than out.

3. Particle pollution is widespread, and it gets inside.

• 44 percent of Americans, some 152.3 million people, live in counties failing ozone or particle pollution. (American Lung Association, 2026)

• Fine particles come in through doors, windows and intakes.
  
  
  

14x24x1 air filter FAQs

Can I use a 14x25x1 filter instead of a 14x24x1?

No. A 14x25x1 is a full inch longer, so it’ll either refuse to seat or leave a gap that lets unfiltered air slip past the filter.

Is 14x24x1 the same as 24x14x1?

Yes. Manufacturers list length and width in either order, so if your old filter reads 24x14x1, order a 14x24x1.

What if my home has two filters?

Some systems have one at the return grille and another at the air handler, and both need changing. Check your HVAC manual for what each slot takes.

Can I wash and reuse a 14x24x1 pleated filter?

No. Filterbuy pleats are electrostatically charged during manufacturing, and water strips that charge. Washable filters are a different product built for it.

About The Author

"I don’t want anyone to feel like they need an HVAC license just to pick the right filter. My job is to give you the straight answer, explain why it matters, and let you get back to your day."

— Michelle Wan, Brand Manager and Air Quality Writer, Filterbuy

Michelle Wan is Filterbuy’s Brand Manager and Air Quality Writer. She works alongside our manufacturing teams in our US plants, so she writes from how filters get built and used. Technically reviewed by David Clark, Licensed HVAC Technician.

Sources

• U.S. EPA, Guide to Air Cleaners in the Home: MERV 13 guidance, filter fit, fan runtime

• U.S. EPA, Report on the Environment: Indoor Air Quality: indoor vs. outdoor pollutant levels

• U.S. Department of Energy, Energy Saver 101: Home Cooling: filters and AC energy use

• American Lung Association, State of the Air 2026: exposure to particle pollution

• ASHRAE, Standards and Guidelines: the MERV scale
  
  
  

Updated: August 24, 2026