Is 18x20x1 air filter profitable to sell on Amazon United States?

The niche generates $1.9M/yr across 18 tracked products. 0 of 1 products launched in the last 360 days are still selling. 90-day search growth is +25.9%. Flapen's verdict: Launch it (63/100).

How competitive is the 18x20x1 air filter niche?

9 brands and 20 sellers compete. The top 5 products take 64% of clicks and top 5 brands hold 95% of demand.

What do buyers complain about in 18x20x1 air filter?

Top complaints mined from reviews: Size-Overall, Filtration, Noise Level. The return rate is 0.9%.

When does demand for 18x20x1 air filter peak?

Demand peaks in Jul; the busiest month runs 1.7× the quietest.

What does it cost to enter the 18x20x1 air filter niche?

Listings span $22.42–$54.91; the average listing price is $37.96 (sweet spot $15–$100). The average incumbent carries 12,271 reviews — the moat a new listing must climb.

18x20x1 air filter

Launch it

A $1.9M/yr market growing +25.9% this quarter with returns at 0.9% — clears our launch bar.

Conversion

Incredible13.0%

search→purchase rate — share of searches ending in a sale

Returns

Incredible0.9%

return rate — above 5% kills the launch gate

Avg price

Incredible$37.96

avg listing price — sweet spot $15–$100

Price range

Incredible$22.42–$54.91

cheapest to priciest tracked listing — scored on the share inside $15–$100

Market size

Great$1.9M

$1.9M/yr · 395K searches

Growth

Good+25.9%

90-day search growth — must beat 0% to launch

Quality gap

Okay4.5★

avg incumbent rating — lower means beatable quality

Competition

Okay64%

top-5 click share — leaders hold, buyers still browse

Review moat

Bad12,271.39

avg incumbent reviews — the moat a new listing must climb

Brand share

Bad95%

top-5 brand share — brand-locked demand

According to Flapen's Amazon United States niche tracking, 18x20x1 air filter is a $1.9M/yr Amazon United States market (395K searches/yr). The top 5 brands hold 95% of demand. Demand peaks in Jul. Verdict: Launch it — 63/100.

Data updated Jul 27, 2026 · scored weekly · How we score niches

18x20x1 air filter market data

Units sold / yr: 50K–60K; avg 3,000–4,000/product
Revenue / yr: $1.9M–$2.3M; units × avg price
Conversion rate: 13.0%
Avg BSR: #75
Page quality: 0%
Prime: 67%
Sponsored: 89%
Out of stock: 0.4%
Avg brand age: 49 months
Avg seller age: 184 days

Competition & brand share

The top 5 products take 64% of clicks — established leaders, but buyers still shop beyond them.

Brands

9 rising

Sellers

Top-5 brand share

95%

Top 20: 100%

Top-5 click share

64%

Top 20: 100%

Open market

Filterbuy28%
Aerostar24%
Simply23%
Filtrete18%
Colorfil3%
protectplusair1%
Open — no brand owns it (3 brands, 4%)

Demand & seasonality

Weekly Amazon search volume, last 104 weeks — +25.9% search growth over the last 90 days.

Peak months: Jul · busiest ÷ quietest = 1.7×

Open Trend

Top 18x20x1 air filter search terms

18x20x1 air filter176K/yr +38.8%11.7% conv.
air filter 18x20x141K/yr +31.2%10.7% conv.
ac filter 18x20x122K/yr +31.5%11.6% conv.
18x20x1 air filter 6 pack12K/yr +47.6%17.2% conv.
18 x 20 x 1 air filters for home18K/yr +31.5%12.6% conv.
furnace filters 18x20x113K/yr +7.2%7.7% conv.
18x20x1 furnace filter23K/yr -35.7%5.4% conv.
20x18x1 air filter10K/yr +42.2%10.8% conv.
18x20x110K/yr +23.5%11.2% conv.
air filters 18x20x19K/yr +23.7%12.7% conv.

All search terms

Top 18x20x1 air filter products on Amazon

Each bubble is one product — market share against review moat; bubble size tracks estimated sales, color grades how beatable the incumbent looks.

Beatable (≤4.3★) Contested Strong incumbent (>4.7★)

All 18 tracked products in this niche — three views at once, no toggling.

Top sellers

by 90-day click share

Simply 18x20x1 Air Filter MERV 8 6 Pack For Home AC Furnace & HVAC (Actual Size: 17.81x19.81x0.75) DUST Pet & Allergy Control

Simply$35.504.7★53,363 rev

Filterbuy 18x20x1 Air Filter MERV 8 Essential Dust & Allergy Defense (4-Pack) Electrostatic Pleated HVAC AC Furnace Filters Replacement Made in USA (Actual Size: 17.50 x 19.50 x 0.75)

Filterbuy$33.024.7★1,632 rev

Filterbuy 18x20x1 Air Filter MERV 8 Essential Dust & Allergy Defense (6-Pack) Electrostatic Pleated HVAC AC Furnace Filters Replacement Made in USA (Actual Size: 17.50 x 19.50 x 0.75)

Filterbuy$37.104.7★51,098 rev

Filtrete 18x20x1 Air Filter MERV 11 MPR 1000 Allergens & Pet Dander 3-Month AC and Furnace Filters Cleaner Air Reliable Airflow 4 HVAC Filters (Actual Size 17.68 x 19.68 x 0.81 in)

Filtrete$42.234.8★25,454 rev

Aerostar 18x20x1 MERV 8 Air Filter 6 Count ACTUAL SIZE (17.50 x 19.50 x 0.75) HVAC Air Conditioning & Furnace Filter Captures Dust Lint & Pollen (MPR 600 / FPR 5) Made in USA

Aerostar$31.444.7★8,371 rev

Newest

by launch date

Clorox 18x20x1 Air Filter MERV 8 with Carbon Reduces Pet Smells Cooking Smells and More Pleated HVAC AC Furnace Filter 4-Pack (Actual Size 17.75 x 19.75 x 0.75) Made in USA

Clorox Air Filters$42.301 rev

2mo ago

Filtrete 18x20x1 Air Filter MERV 13 MPR 1900 Allergens Bacteria Viruses & Air Pollutants 3-Month AC/Furnace Filters Cleaner Air Reliable Airflow 2 HVAC Filters(Act Size 17.81x19.81x0.78 in)

Filtrete$43.5817,142 rev

1y ago

Filtrete 18x20x1 AC Furnace Air Filter MPR 700 MERV 8 Tough on Pollen Easy on Airflow 3-Month Pleated 1-Inch Electrostatic Air Cleaning Filter 2-Pack (Actual Size 17.81 x 19.81 x 0.81 in)

Filtrete$22.42740 rev

1y ago

BNX TruFilter 18x20x1 Air Filter MERV 13 (6-Pack) - MADE IN USA - Electrostatic Pleated Air Conditioner HVAC AC Furnace Filters for Allergies Pollen Mold Bacteria Smoke Allergen MPR 1900 FPR 10

BNX$54.917,885 rev

2y ago

Simply 18x20x1 Air Filter Merv 11 6 Pack For Home AC Furnace & HVAC (Actual Size: 17.81x19.81x0.75) DUST Pet & Allergy Control

Simply$37.106,555 rev

3y ago

What buyers say about 18x20x1 air filter

What buyers praise and complain about, mined from review topics.

What buyers love

Filtration23%

“Great filters for the price”

Quality-Overall16%

“Well constructed”

Size-Overall16%

“Fit was accurate”

Value For Money16%

“Great value”

Advertised Vs Actual Product8%

“Does job”

Efficiency4%

“Works well”

Durability2%

“Works great, last about 3 months”

Assembly/Installation2%

“Easy to install”

Strength1%

“They are sturdy”

Ease Of Use1%

“easy to use”

What buyers complain about

Size-Overall24%

“not standard size”

Filtration10%

“I bought some more expensive carbon filters”

Noise Level9%

“It whistled loudly”

Durability7%

“dont last long”

Value For Money4%

“My only complaint is that the price seems to consistently increase”

Quality-Overall3%

“Theyre not as goodly made as they say”

Advertised Vs Actual Product3%

“Please fix your advertisement”

Design-Overall2%

“No structural integrity, cheaply built”

Ease Of Cleaning2%

“it doesn't get rid of dust, particles”

Smell2%

“you can't smell it in the home”

Top return reasons

Size-Overall82%

Filtration10%

Compatibility-Overall4%

Value For Money2%

Advertised Vs Actual Product1%

Certifications1%

Thickness0%

Water Resistance0%

Functionality-Overall0%

Defective Material/Parts0%

Common questions

Is 18x20x1 air filter profitable to sell on Amazon United States?: The niche generates $1.9M/yr across 18 tracked products. 0 of 1 products launched in the last 360 days are still selling. 90-day search growth is +25.9%. Flapen's verdict: Launch it (63/100).
How competitive is the 18x20x1 air filter niche?: 9 brands and 20 sellers compete. The top 5 products take 64% of clicks and top 5 brands hold 95% of demand.
What do buyers complain about in 18x20x1 air filter?: Top complaints mined from reviews: Size-Overall, Filtration, Noise Level. The return rate is 0.9%.
When does demand for 18x20x1 air filter peak?: Demand peaks in Jul; the busiest month runs 1.7× the quietest.
What does it cost to enter the 18x20x1 air filter niche?: Listings span $22.42–$54.91; the average listing price is $37.96 (sweet spot $15–$100). The average incumbent carries 12,271 reviews — the moat a new listing must climb.