Is 20x24x4 air filter profitable to sell on Amazon United States?

The niche generates $201K/yr across 17 tracked products. 0 of 1 products launched in the last 360 days are still selling. 90-day search growth is +22.9%. Flapen's verdict: Worth a look (50/100).

How competitive is the 20x24x4 air filter niche?

8 brands and 32 sellers compete. The top 5 products take 65% of clicks and top 5 brands hold 91% of demand.

What do buyers complain about in 20x24x4 air filter?

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

When does demand for 20x24x4 air filter peak?

Demand is steady year-round — the busiest month runs 1.5× the quietest.

What does it cost to enter the 20x24x4 air filter niche?

Listings span $21.97–$126.80; the average listing price is $64.88 (sweet spot $15–$100). The average incumbent carries 12,621 reviews — the moat a new listing must climb.

20x24x4 air filter

Worth a look

Shows searches that convert (10.3% search→purchase), but a deep review moat (12,621 avg reviews) keeps it on the watch list.

Conversion

Great10.3%

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

Avg price

Great$64.88

avg listing price — sweet spot $15–$100

Returns

Great1.5%

return rate — above 5% kills the launch gate

Price range

Good$21.97–$126.80

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

Growth

Good+22.9%

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

Market size

Okay$201K

$201K/yr · 30K searches

Competition

Okay65%

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

Quality gap

Okay4.6★

avg incumbent rating — lower means beatable quality

Brand share

Bad91%

top-5 brand share — brand-locked demand

Review moat

Bad12,620.82

avg incumbent reviews — the moat a new listing must climb

Signals High Price

According to Flapen's Amazon United States niche tracking, 20x24x4 air filter is a $201K/yr Amazon United States market (30K searches/yr). The top 5 brands hold 91% of demand. Verdict: Worth a look — 50/100.

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

20x24x4 air filter market data

Units sold / yr: 3K–4K; avg 100–250/product
Revenue / yr: $195K–$260K; units × avg price
Conversion rate: 10.3%
Avg BSR: #114
Page quality: 0%
Prime: 35%
Sponsored: 94%
Out of stock: 7.2%
Avg brand age: 62 months
Avg seller age: 211 days

Competition & brand share

The top 5 products take 65% of clicks — established leaders, but buyers still shop beyond them.

Brands

8 flat

Sellers

Top-5 brand share

91%

Top 20: 100%

Top-5 click share

65%

Top 20: 100%

Open market

Filterbuy39%
Filtrete20%
Nordic Pure15%
MANN+HUMMEL11%
Filter King7%
Simply4%
Open — no brand owns it (2 brands, 5%)

Demand & seasonality

Weekly Amazon search volume, last 102 weeks — +22.9% search growth over the last 90 days.

No pronounced peak months · busiest ÷ quietest = 1.5×

Open Trend

Top 20x24x4 air filter search terms

20x24x4 air filter20K/yr +33.9%8.9% conv.
20x24x4 furnace filter5K/yr -7.9%10.1% conv.
air filter 20x24x43K/yr +1.2%11.3% conv.
20x24x42K/yr +38.5%10.1% conv.

All search terms

Top 20x24x4 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 17 tracked products in this niche — three views at once, no toggling.

Top sellers

by 90-day click share

Filterbuy 20x24x4 Air Filter MERV 8 Essential Dust & Allergy Defense (2-Pack) Electrostatic Pleated HVAC AC Furnace Filters Replacement Made in USA (Actual Size: 19.38 x 23.38 x 3.63)

Filterbuy$48.104.6★68,921 rev

Nordic Pure 20x24x4 Pleated MERV 12 Air Filters 2 Pack

Nordic Pure$47.394.6★564 rev

Filtrete 20x25x4 Air Filter MERV 11 MPR 1000 Micro Allergen Defense 2-Pack Fits Honeywell & AprilAire AC Furnace HVAC Filters for Home Pleated Electrostatic (Actual Size 19.88 x 24.63 x 4.31 in)

Filtrete$44.904.7★1,983 rev

Filterbuy 20x24x4 Air Filter MERV 8 Essential Dust & Allergy Defense (4-Pack) Electrostatic Pleated HVAC AC Furnace Filters Replacement Made in USA (Actual Size: 19.38 x 23.38 x 3.63)

Filterbuy$79.324.6★100 rev

MANN+HUMMEL 20x24x4 MERV 8 Pleated 4 AC Furnace Air Filter. 3 Pack

MANN+HUMMEL$53.104.5★265 rev

Newest

by launch date

FilterTime 20x24x4 AC Furnace Air Filter MERV 8 1-Pack (exact dimensions 19.5 x 23.5 x 3.75) AC Filter Furnace Filter Home Air Filter Made in USA.

FilterTime$21.9712 rev

4mo ago

Simply 20x25x4 Air Filter MERV 8 4 Pack Furnace Air Filter for HVAC (Actual Size:19.5x24.5x3.63) DUST Pet & Allergy Control

Simply$50.275,182 rev

1y ago

Simply 20x25x4 Air Filter MERV 8 6 Pack Furnace Air Filter for HVAC (Actual Size:19.5x24.5x3.63) DUST Pet & Allergy Control

Simply$70.4953,363 rev

1y ago

MANN+HUMMEL 20x24x4 MERV 8 Pleated 4 AC Furnace Air Filter. 3 Pack

MANN+HUMMEL$53.10265 rev

2y ago

MANN+HUMMEL 20x24x4 MERV 8 Pleated 4 AC Furnace Air Filter. 2 Pack

MANN+HUMMEL$38.95437 rev

2y ago

What buyers say about 20x24x4 air filter

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

What buyers love

Filtration22%

“Good quality, high-level filtration”

Value For Money20%

“Great Deal”

Size-Overall19%

“They fit just like expected”

Quality-Overall12%

“For starters, the seller is top notch”

Advertised Vs Actual Product6%

“Just as advertised”

Ease Of Use5%

“Easy”

Strength2%

“Sturdy”

Product Condition2%

“A new one is really needed”

Certifications2%

“Approved by furnace technician”

Efficiency2%

“Worked well for our systmen”

What buyers complain about

Size-Overall49%

“its too large”

Filtration15%

“One of the furnace filters was damaged”

Thickness7%

“while this one is about half an inch thinner”

Advertised Vs Actual Product6%

“Measurements are off”

Value For Money5%

“for $10 less per filter”

Quality-Overall3%

“Quality control is not the best. for a brand name”

Design-Overall2%

“Not very well built”

Product Condition1%

“Amazon Resale came through”

Measurement/Reading Accuracy1%

“So my mistake was not measuring”

Assembly/Installation1%

“rip while installing the first one”

Top return reasons

Size-Overall69%

Filtration15%

Compatibility-Overall8%

Value For Money5%

Advertised Vs Actual Product2%

Thickness1%

Defective Material/Parts0%

Thin0%

Ease Of Use0%

Product Condition0%

Common questions

Is 20x24x4 air filter profitable to sell on Amazon United States?: The niche generates $201K/yr across 17 tracked products. 0 of 1 products launched in the last 360 days are still selling. 90-day search growth is +22.9%. Flapen's verdict: Worth a look (50/100).
How competitive is the 20x24x4 air filter niche?: 8 brands and 32 sellers compete. The top 5 products take 65% of clicks and top 5 brands hold 91% of demand.
What do buyers complain about in 20x24x4 air filter?: Top complaints mined from reviews: Size-Overall, Filtration, Thickness. The return rate is 1.5%.
When does demand for 20x24x4 air filter peak?: Demand is steady year-round — the busiest month runs 1.5× the quietest.
What does it cost to enter the 20x24x4 air filter niche?: Listings span $21.97–$126.80; the average listing price is $64.88 (sweet spot $15–$100). The average incumbent carries 12,621 reviews — the moat a new listing must climb.