19 7/8 x 21 1/2 x1 ac filter
Worth a lookShows searches that convert (16.9% search→purchase), but brand-locked demand (top 5 brands take 100% of clicks) keeps it on the watch list.
Conversion
Incredible16.9%search→purchase rate — share of searches ending in a sale
Price range
Incredible$33.56–$66.74cheapest to priciest tracked listing — scored on the share inside $15–$100
Avg price
Great$49.44avg listing price — sweet spot $15–$100
Returns
Great1.4%return rate — above 5% kills the launch gate
Growth
Good+36.6%90-day search growth — must beat 0% to launch
Review moat
Okay1,732.25avg incumbent reviews — the moat a new listing must climb
Market size
Okay$174K$174K/yr · 21K searches
Competition
Bad73%top-5 click share — a locked-up shelf
Quality gap
Bad4.7★avg incumbent rating — lower means beatable quality
Brand share
Bad100%top-5 brand share — brand-locked demand
According to Flapen's Amazon United States niche tracking, 19 7/8 x 21 1/2 x1 ac filter is a $174K/yr Amazon United States market (21K searches/yr). The top 5 brands hold 100% of demand. Demand peaks in Jul–Aug. Verdict: Worth a look — 50/100.
Data updated Jul 27, 2026 · scored weekly · How we score niches
19 7/8 x 21 1/2 x1 ac filter market data
- Units sold / yr
- 3K–4K
- avg 100–250/product
- Revenue / yr
- $148K–$198K
- units × avg price
- Conversion rate
- 16.9%
- Avg BSR
- #256
- Page quality
- 0%
- Prime
- 75%
- Sponsored
- 83%
- Out of stock
- 8.6%
- Avg brand age
- 62 months
- Avg seller age
- 200 days
Competition & brand share
The top 5 products capture 73% of clicks — a locked-up shelf that new listings rarely crack.Brands
5 falling
Sellers
12
Top-5 brand share
100%
Top 20: 100%
Top-5 click share
73%
Top 20: 100%
Open market
0%
- Aerostar76%
- Chenzhit12%
- Glasfloss5%
- Qingzhug3%
- Filtrete3%
- Open — no brand owns it (0%)
Demand & seasonality
Weekly Amazon search volume, last 102 weeks — +36.6% search growth over the last 90 days.Peak months: Jul, Aug · busiest ÷ quietest = 2.2×
Top 19 7/8 x 21 1/2 x1 ac filter search terms
- 19 7/8 x 21 1/2 x 1 air filter17K/yr
- ac filter 19 7/8 x 21 1/2 x13K/yr
- air filter 19 7/8 x 21 1/2 x 1743/yr
Top 19 7/8 x 21 1/2 x1 ac 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.
All 12 tracked products in this niche — three views at once, no toggling.
Top sellers
by 90-day click share
Aerostar 19.875x21.5x1 MERV 8 Air Filter 6 Count ACTUAL SIZE (19.875 x 21.50 x 0.75) HVAC Air Conditioning & Furnace Filter Captures Dust Lint & Pollen (MPR 600 / FPR 5) Made in USA
Aerostar$47.094.7★2,769 rev
Aerostar 19 7/8 x 21 1/2 x 1 MERV 6 Pleated Air Filter AC Furnace Air Filter 6 Pack (Actual Size: 19 7/8x21 1/2x3/4)
Aerostar$33.564.6★166 rev
Aerostar 19.875x21.5x1 MERV 13 - 6 Count - Pleated HVAC Furnace & Air Conditioner Filters - For Bacteria Dust Cold & Flu Germs Lint Mold Pet Dander Allergy-Causing Pollen Smog Smoke & Viruses
Aerostar$51.074.6★3,426 rev
Aerostar 19 7/8x21 1/2x1 MERV 13 High Efficiency Pleated Air Filter 4-Pack Electrostatic AC Furnace HVAC Replacement Captures Smoke Bacteria Allergy Dust Pollen Pet Dander (19.875x21.5x0.75)
Aerostar$52.664.6★395 rev
Aerostar 19.875x21.5x1 MERV 8 - 4 Count - High Efficiency Pleated HVAC Furnace & Air Conditioner Filters - Removes Dust Lint Mold & Allergy-Causing Pollen
Aerostar$35.654.7★2,769 rev
Newest
by launch date
Qingzhug 19 7/8x21 1/2x1 MERV 13 (6-Pack) Pleated Air Filter (Actual Size: 19 7/8x21 1/2x3/4) MPR 1900 & FPR 10 Furnace Air Filters 19 7/8x21 1/2x1 air filter
Qingzhug$56.72486 rev
Chenzhit (4-Pack) 19 7/8x21 1/2x1 Furnace Air Filters MPR 1900 & FPR 10 MERV 13 Pleated Air Filter (Actual Size: 19 7/8x21 1/2x3/4)
Chenzhit$50.36647 rev
Chenzhit (6- Pack) 19 7/8x21 1/2x1 Furnace Air Filters MPR 1900 & FPR 10 MERV 13 Pleated Air Filter (Actual Size: 19 7/8x21 1/2x3/4)
Chenzhit$58.59647 rev
Filtrete 19.875x21.5x1 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 19.56 x 21.19 x 0.81 in)
Filtrete$42.536,265 rev
Aerostar 19 7/8 x 21 1/2 x 1 MERV 6 Pleated Air Filter AC Furnace Air Filter 6 Pack (Actual Size: 19 7/8x21 1/2x3/4)
Aerostar$33.56166 rev
Trending
90-day click momentumAerostar 19 7/8x21 1/2x1 MERV 13 High Efficiency Pleated Air Filter 4-Pack Electrostatic AC Furnace HVAC Replacement Captures Smoke Bacteria Allergy Dust Pollen Pet Dander (19.875x21.5x0.75)
Aerostar$52.664.6★
Chenzhit (4-Pack) 19 7/8x21 1/2x1 Furnace Air Filters MPR 1900 & FPR 10 MERV 13 Pleated Air Filter (Actual Size: 19 7/8x21 1/2x3/4)
Chenzhit$50.364.7★
Qingzhug 19 7/8x21 1/2x1 MERV 13 (6-Pack) Pleated Air Filter (Actual Size: 19 7/8x21 1/2x3/4) MPR 1900 & FPR 10 Furnace Air Filters 19 7/8x21 1/2x1 air filter
Qingzhug$56.724.7★
Aerostar 19.875x21.5x1 MERV 13 - 6 Count - Pleated HVAC Furnace & Air Conditioner Filters - For Bacteria Dust Cold & Flu Germs Lint Mold Pet Dander Allergy-Causing Pollen Smog Smoke & Viruses
Aerostar$51.074.6★
Glasfloss 19-7/8x21-1/2x1 MERV 10 Pleated Filters Fits Carrier. 6-Pack
Glasfloss$66.744.8★
What buyers say about 19 7/8 x 21 1/2 x1 ac filter
What buyers praise and complain about, mined from review topics.What buyers love
“As always GREAT quality air filter with fast shipping”
“Perfect fit”
“Good quality”
“Great value”
“These have kept my unit running for over a decade”
“seems strong”
“Works great”
“In addition they are easy to use and fit great”
What buyers complain about
“Flimsy and cheaply made”
“Arrived dented and with blue stains”
“Flimsy and cheaply made”
“Doesn't filter out allergies”
“the cheap cardboard 'frame' didn't stay glued”
“Doesn't filter out allergies”
“not put together well”
Top return reasons
Common questions
- Is 19 7/8 x 21 1/2 x1 ac filter profitable to sell on Amazon United States?
- The niche generates $174K/yr across 12 tracked products. 90-day search growth is +36.6%. Flapen's verdict: Worth a look (50/100).
- How competitive is the 19 7/8 x 21 1/2 x1 ac filter niche?
- 5 brands and 12 sellers compete. The top 5 products take 73% of clicks and top 5 brands hold 100% of demand.
- What do buyers complain about in 19 7/8 x 21 1/2 x1 ac filter?
- Top complaints mined from reviews: Strength, Stain Resistance, Quality-Overall. The return rate is 1.4%.
- When does demand for 19 7/8 x 21 1/2 x1 ac filter peak?
- Demand peaks in Jul–Aug; the busiest month runs 2.2× the quietest.
- What does it cost to enter the 19 7/8 x 21 1/2 x1 ac filter niche?
- Listings span $33.56–$66.74; the average listing price is $49.44 (sweet spot $15–$100). The average incumbent carries 1,732 reviews — the moat a new listing must climb.