Is 18x25x1 air filter profitable to sell on Amazon United States?

The niche generates $187K/yr across 13 tracked products. 90-day search growth is +28.3%. Flapen's verdict: Skip it (48/100).

How competitive is the 18x25x1 air filter niche?

6 brands and 25 sellers compete. The top 5 products take 74% of clicks and top 5 brands hold 98% of demand.

What do buyers complain about in 18x25x1 air filter?

Top complaints mined from reviews: Size-Overall, Quality-Overall, Strength. The return rate is 1.5%.

When does demand for 18x25x1 air filter peak?

Demand peaks in Jul; the busiest month runs 1.8× the quietest.

What does it cost to enter the 18x25x1 air filter niche?

Listings span $31.33–$68.13; the average listing price is $46.56 (sweet spot $15–$100). The average incumbent carries 17,708 reviews — the moat a new listing must climb.

18x25x1 air filter

Skip it

Brand-locked demand (top 5 brands take 98% of clicks) — this niche doesn't clear our bar today.

Price range

Incredible$31.33–$68.13

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

Avg price

Great$46.56

avg listing price — sweet spot $15–$100

Conversion

Great11.4%

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

Returns

Great1.5%

return rate — above 5% kills the launch gate

Growth

Good+28.3%

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

Market size

Okay$187K

$187K/yr · 35K searches

Quality gap

Bad4.6★

avg incumbent rating — lower means beatable quality

Competition

Bad74%

top-5 click share — a locked-up shelf

Review moat

Bad17,708.38

avg incumbent reviews — the moat a new listing must climb

Brand share

Bad98%

top-5 brand share — brand-locked demand

According to Flapen's Amazon United States niche tracking, 18x25x1 air filter is a $187K/yr Amazon United States market (35K searches/yr). The top 5 brands hold 98% of demand. Demand peaks in Jul. Verdict: Skip it — 48/100.

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

18x25x1 air filter market data

Units sold / yr: 4K–5K; avg 250–500/product
Revenue / yr: $186K–$233K; units × avg price
Conversion rate: 11.4%
Avg BSR: #218
Page quality: 0%
Prime: 62%
Sponsored: 77%
Out of stock: 1.2%
Avg brand age: 76 months
Avg seller age: 191 days

Competition & brand share

The top 5 products capture 74% of clicks — a locked-up shelf that new listings rarely crack.

Brands

6 falling

Sellers

Top-5 brand share

98%

Top 20: 100%

Top-5 click share

74%

Top 20: 100%

Open market

Simply47%
Filterbuy23%
Filtrete22%
True Blue4%
Nordic Pure3%
Flanders2%

Demand & seasonality

Weekly Amazon search volume, last 104 weeks — +28.3% search growth over the last 90 days.

Peak months: Jul · busiest ÷ quietest = 1.8×

Open Trend

Top 18x25x1 air filter search terms

18x25x1 air filter24K/yr +39.4%9.8% conv.
18x25x1 furnace filter7K/yr -15.8%10.8% conv.
air filter 18x25x14K/yr +34.8%13.7% conv.

All search terms

Top 18x25x1 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 13 tracked products in this niche — three views at once, no toggling.

Top sellers

by 90-day click share

Simply 18x25x1 Air Filter Merv 8 6 Pack For Home AC Furnace & HVAC (Actual Size: 17.75x24.75x0.75) DUST Pet & Allergy Control

Simply$41.484.7★53,363 rev

Simply 18x25x1 Air Filter Merv 8 4 Pack For Home AC Furnace & HVAC (Actual Size: 17.75x24.75x0.75) DUST Pet & Allergy Control

Simply$31.334.6★5,182 rev

Filtrete 18x25x1 AC Furnace Air Filter MERV 8 MPR 700 Tough on Pollen Easy on Airflow 3-Month Pleated 1-Inch Electrostatic Air Cleaning Filter 4-Pack (Actual Size 17.81 x 24.81 x 0.81 in)

Filtrete$42.714.7★6,265 rev

Filterbuy 18x25x1 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 24.50 x 0.75)

Filterbuy$44.854.7★563 rev

Filtrete 18x25x1 Air Filter MERV 12 MPR 1500 Allergens Bacteria & Viruses 3-Month AC and Furnace Filters Cleaner Air Reliable Airflow 4 HVAC Filters (Actual Size 17.81 x 24.81 x 0.78 in)

Filtrete$50.074.8★6,622 rev

Newest

by launch date

Filtrete 18x25x1 Air Filter MERV 12 MPR 1500 Allergens Bacteria & Viruses 3-Month AC and Furnace Filters Cleaner Air Reliable Airflow 4 HVAC Filters (Actual Size 17.81 x 24.81 x 0.78 in)

Filtrete$50.076,622 rev

1y ago

Simply 18x25x1 Air Filter MERV 11 4 Pack For Home AC Furnace & HVAC (Actual Size: 17.75x24.75x0.75) DUST Pet & Allergy Control

Simply$37.35182 rev

2y ago

Filtrete 18x25x1 AC Furnace Air Filter MERV 8 MPR 700 Tough on Pollen Easy on Airflow 3-Month Pleated 1-Inch Electrostatic Air Cleaning Filter 4-Pack (Actual Size 17.81 x 24.81 x 0.81 in)

Filtrete$42.716,265 rev

2y ago

Simply 18x25x1 Air Filter Merv 8 6 Pack For Home AC Furnace & HVAC (Actual Size: 17.75x24.75x0.75) DUST Pet & Allergy Control

Simply$41.4853,363 rev

4y ago

Simply 18x25x1 Air Filter Merv 11 6 Pack For Home AC Furnace & HVAC (Actual Size: 17.75x24.75x0.75) DUST Pet & Allergy Control

Simply$48.526,555 rev

4y ago

What buyers say about 18x25x1 air filter

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

What buyers love

Filtration36%

“This air filter works well and fits perfectly”

Size-Overall28%

“Perfect size”

Value For Money19%

“Great transaction”

Ease Of Use6%

“Easy to use”

Durability3%

“It's durable and lasts”

What buyers complain about

Size-Overall44%

“They dont fit”

Quality-Overall17%

“Poor quality”

Strength17%

“Flimsy and poor quality”

Jamming/Clogging11%

“I jammed it in”

Top return reasons

Size-Overall84%

Filtration8%

Compatibility-Overall3%

Advertised Vs Actual Product1%

Product Condition1%

Value For Money1%

Assembly/Installation0%

Color0%

Defective Material/Parts0%

Quality-Overall0%

Common questions

Is 18x25x1 air filter profitable to sell on Amazon United States?: The niche generates $187K/yr across 13 tracked products. 90-day search growth is +28.3%. Flapen's verdict: Skip it (48/100).
How competitive is the 18x25x1 air filter niche?: 6 brands and 25 sellers compete. The top 5 products take 74% of clicks and top 5 brands hold 98% of demand.
What do buyers complain about in 18x25x1 air filter?: Top complaints mined from reviews: Size-Overall, Quality-Overall, Strength. The return rate is 1.5%.
When does demand for 18x25x1 air filter peak?: Demand peaks in Jul; the busiest month runs 1.8× the quietest.
What does it cost to enter the 18x25x1 air filter niche?: Listings span $31.33–$68.13; the average listing price is $46.56 (sweet spot $15–$100). The average incumbent carries 17,708 reviews — the moat a new listing must climb.