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Medium (11"-20")
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Wide (20"+)
19.75x21x0.5 20x20x0.5 20x21x0.5 20x22x0.5 20x23x0.5
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Medium (11"-20")
11.5x11.5x1 14x14x1 15.5x19.5x1 16x19x1 16x20x1
17x21x1 17.5x17.5x1 17.5x22x1 19.5x19.5x1 19.5x23.5x1
Wide (20"+)
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Medium (11"-20")
14x14x2 14x20x2 14x25x2 16x16x2 16x20x2
16x24x2 16x25x2 16x30x2 18x20x2 18x24x2
Wide (20"+)
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Medium (11"-20")
12x20x4 14x20x4 15x25x4 15.5x24.5x4 16x16x4
16x20x4 16x24x4 16x25x4 19.5x19.5x4 19.5x24.5x4
Wide (20"+)
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MERVs explained
POPULAR MERV 8 SIZES
Narrow (<10")
6x14x1 6x30x1 8x8x1 8x12x1 8x14x1
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Medium (11"-20")
11.5x11.5x1 15.5x19.5x1 16x20x1 16x20x2 16x25x2
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Shop MERV 8 air filters
POPULAR MERV 11 SIZES
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8x8x1 8x14x1 8x24x1 8x30x1 9.5x9.5x1
10x10x1 10x14x1 10x20x1 10x30x1 10x36x1
Medium (11"-20")
11.5x11.5x1 12x12x1 14x14x1 16x16x1 16x20x1
16x25x1 16x25x4 18x24x1 19x23x1 19.5x19.5x1
Wide (20"+)
20x20x1 20x20x4 20x24x1 20x25x1 20x25x4
20x30x1 23.5x23.5x1 24x24x1 24x30x1 30x36x1
Shop MERV 11 air filters
POPULAR MERV 13 SIZES
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8x8x1 8x24x1 9x11x1 9x11.38x1 9.5x9.5x1
10x10x1 10x10x2 10x20x1 10x30x1 10x36x1
Medium (11"-20")
12x12x1 14x14x1 16x16x1 16x20x1 16x25x1
16x25x4 17.5x17.5x1 18x20x1 19.5x19.5x1 19.5x23.5x1
Wide (20"+)
20x20x1 20x20x4 20x23x1 20x25x1 20x25x4
20x30x1 20x40x1 21x21x1 21x23x1 30x30x1
Shop MERV 13 air filters
POPULAR MERV 8 CARBON SIZES
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6x30x1 8x8x1 8x24x1 8x30x1 9.5x9.5x1
10x10x1 10x20x1 10x24x1 10x30x1 10x36x1
Medium (11"-20")
12x12x1 14x14x1 14x20x1 14x30x1 16x20x1
16x25x1 18x20x1 19x20x2 19.5x19.5x1 19.5x23.5x1
Wide (20"+)
20x20x1 20x23x1 20x24x1 20x25x1 20x25x4
20x30x1 20x40x1 24x24x1 24x30x1 30x30x1
Shop MERV 8 Carbon odor eliminator air filters
POPULAR MERV 8 FREEDOM SIZES
Medium (11"-20")
16x20x1 16x25x1 18x24x1 18x30x1
Wide (20"+)
20x20x1 20x25x1 24x24x1
Shop limited edition Freedom Filters

Air filter delivery subscription service

Never miss a filter change again with fresh filters delivered to your door right when you need them. Set up automatic air filter delivery on a schedule that works for your home.

Save 5% on every order
Fast, free shipping
Cancel/change any time
Certified quality

Fresh air filters, right on schedule.

Keep your indoor air clean and your HVAC unit running smoothly without last-minute store runs.

1.

Pick your air filter

Select the size, MERV rating, and pack size that fits your needs.

2.

Enable auto-delivery

Opt in for auto delivery subscription and get 5% off.

3.

Choose your schedule

Set your delivery frequency - every 1, 2, 3, 6, or 12 months.

4.

Relax and breathe easy

Get fresh filters delivered to your door right on time.

Why Choose Furnace Filters

Why choose auto‑delivery

Fresh air, efficient HVAC performance

Keep your air clean and HVAC unit running smoothly. Lower your energy bills and reduce the risk for costly repairs.

Save 5% on every order

No more worries about forgetting to order new filters while saving an extra 5% discount on every order.

Pause, change, or cancel any time

No minimum subscription period - you can pause, cancel or change your delivery frequency at any time.

Premium filters assembled in the USA

All Filter King filters are assembled in the USA in accordance to ASHRAE specifications and MERV rating standards.

Find your size once. Never run out.

10,000+ satisfied customers

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4.6 stars, 5243 reviews

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4.5 stars, 4314 reviews

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"I am a new customer and so happy I found Filter King. Their customer service is truly outstanding."

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"Exactly what I needed. Order arrived quickly."

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"Great selection, fair prices and quick shipping! What more could we want?? THANK YOU!!"

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"Great service"

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"Great deal and quick delivery"

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"Great produce at a fair price"

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"Good stuff"

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"Great Service, shipping was fast, got in two days from ordering."

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"Great fit good price"

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Never forget a filter change again

For most homes with a 1-inch filter, 60–90 days is a reliable baseline. But filter type, thickness, pets, allergies, and local climate can all shift that window – sometimes significantly. Read this guide to find the right schedule for your home.

Keep your home’s air fresh and your HVAC unit running smoothly without last-minute store runs, reminder notes or extra chores on your todo list. And save 5% off every order while you’re at it.

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Choosing your air filter change schedule

Filter replacement guide

How often should you
replace your air filter?

Take the quiz

Frequently Asked Questions

Your delivery frequency should be based on how often you need to change filters and how many filters stock up with each delivery - ordering larger filter packs will help lower the price per filter. You can also use our change frequency quiz if you're not sure how frequently you should be changing your air filters.

Yes, you can change your delivery frequency at any time.

Yes you can pause or cancel air filter subscription service at any time. There is no minimum subscription period for our air filter auto-delivery service.

Yes, the 5% discount applies to the first and all future orders you receive using our auto-delivery service.

No, you can set up auto-delivery for as few or many filters as you want.

Yes, simply add any size you need to your order and enable auto-delivery in the product page or during checkout to enable subscription for that air filter.

Yes, shipping is free on all website and subscription orders.

If you haven't run out before auto-delivery is due, you can pause your subscription and reenable it later.

Find your size. Choose schedule. Done.

Find your filter and set up automatic deliveries so replacements arrive right when you need them.

Find your size
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