---
title: "19 7/8 X 21 1/2 X1 Ac Filter — $174K/yr Amazon US Niche (2026) - Flapen"
canonical_url: "https://flapen.com/research/us/tools-home-improvement/19-7-8-x-21-1-2-x1-ac-filter"
last_updated: "2026-08-07T13:58:15.561Z"
locale: en
meta:
description: "Niche score 50/100 · $174K/yr market. Brand-locked demand (top 5 brands take 100% of clicks) keeps it on the watch list. Data updated Jul 2026."
"og:description": "Niche score 50/100 · $174K/yr market. Brand-locked demand (top 5 brands take 100% of clicks) keeps it on the watch list. Data updated Jul 2026."
"og:title": "19 7/8 X 21 1/2 X1 Ac Filter — $174K/yr Amazon US Niche (2026) - Flapen"
---
# **19 7/8 x 21 1/2 x1 ac filter**
**Worth a look**
Shows searches that convert (16.9% search→purchase), but brand-locked demand (top 5 brands take 100% of clicks) keeps it on the watch list.
Market size 36Growth 60Conversion 98Competition 22Returns 87Price range 95Avg price 93Brand share 0Review moat 48Quality gap 19
**Conversion**
**Incredible****16.9%**
search→purchase rate — share of searches ending in a sale
**Price range**
**Incredible****$33.56–$66.74**
cheapest to priciest tracked listing — scored on the share inside $15–$100
**Avg price**
**Great****$49.44**
avg listing price — sweet spot $15–$100
**Returns**
**Great****1.4%**
return rate — above 5% kills the launch gate
**Growth**
**Good****+36.6%**
90-day search growth — must beat 0% to launch
**Review moat**
**Okay****1,732.25**
avg incumbent reviews — the moat a new listing must climb
**Market size**
**Okay****$174K**
$174K/yr · 21K searches
**Competition**
**Bad****73%**
top-5 click share — a locked-up shelf
**Quality gap**
**Bad****4.7★**
avg incumbent rating — lower means beatable quality
**Brand share**
**Bad****100%**
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 ~~](https://flapen.com/research/methodology)
## **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.
800600Black Friday '24Spike '25Prime Day '25Spike '26 seasonDecMarJunAugNovMarMay
Peak months: Jul, Aug · busiest ÷ quietest = 2.2×
[**Open Trend **](https://flapen.com/research/us/tools-home-improvement/19-7-8-x-21-1-2-x1-ac-filter/trend)
## **Top 19 7/8 x 21 1/2 x1 ac filter search terms**
- **19 7/8 x 21 1/2 x 1 air filter**17K/yr+38.9%15.2% conv. - **ac filter 19 7/8 x 21 1/2 x1**3K/yr+13.3%16.7% conv. - **air filter 19 7/8 x 21 1/2 x 1**743/yr+110.5%18.2% conv. [**All search terms **](https://flapen.com/research/us/tools-home-improvement/19-7-8-x-21-1-2-x1-ac-filter/search-terms)
## **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.
0%10%$17K20%$35K30%$52K40%$70K1001K10K Reviews — right = deep review moatMarket share (90d) ≈ est. sales
Beatable (≤4.3★) Contested Strong incumbent (>4.7★)
All 12 tracked products in this niche — three views at once, no toggling.
### **Top sellers**
by 90-day click share
[1**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**$47.09**4.7★2,769 rev](https://www.amazon.com/dp/B01CSWQPZG) [2**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**$33.56**4.6★166 rev](https://www.amazon.com/dp/B0CN83HWHM) [3**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**$51.07**4.6★3,426 rev](https://www.amazon.com/dp/B01CR9JG4C) [4**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**$52.66**4.6★395 rev](https://www.amazon.com/dp/B07C12J1YM) [5**Aerostar 19.875x21.5x1 MERV 8 - 4 Count - High Efficiency Pleated HVAC Furnace & Air Conditioner Filters - Removes Dust Lint Mold & Allergy-Causing Pollen**Aerostar**$35.65**4.7★2,769 rev](https://www.amazon.com/dp/B082JY8CWJ)
**~~View all top sellers →~~**
### **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**$56.72**486 rev1y ago](https://www.amazon.com/dp/B0FJL6GJBM) [**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**$50.36**647 rev1y ago](https://www.amazon.com/dp/B0FGX48WFK) [**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**$58.59**647 rev1y ago](https://www.amazon.com/dp/B0DS2LHPHD) [**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**$42.53**6,265 rev2y ago](https://www.amazon.com/dp/B0CZC4MCP4) [**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**$33.56**166 rev2y ago](https://www.amazon.com/dp/B0CN83HWHM)
**~~View all new products →~~**
### **Trending**
90-day click momentum
[**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**$52.66**4.6★**▲ 198%**](https://www.amazon.com/dp/B07C12J1YM) [**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**$50.36**4.7★**▲ 94%**](https://www.amazon.com/dp/B0FGX48WFK) [**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**$56.72**4.7★**▲ 38%**](https://www.amazon.com/dp/B0FJL6GJBM) [**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**$51.07**4.6★**— 4%**](https://www.amazon.com/dp/B01CR9JG4C) [**Glasfloss 19-7/8x21-1/2x1 MERV 10 Pleated Filters Fits Carrier. 6-Pack**Glasfloss**$66.74**4.8★**— 3%**](https://www.amazon.com/dp/B089KV1Q8R)
**~~View all trending →~~**
## **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 **
**Filtration**21%
*“As always GREAT quality air filter with fast shipping”*
**Size-Overall**20%
*“Perfect fit”*
**Quality-Overall**20%
*“Good quality”*
**Value For Money**16%
*“Great value”*
**Durability**11%
*“These have kept my unit running for over a decade”*
**Strength**4%
*“seems strong”*
**Efficiency**4%
*“Works great”*
**Ease Of Use**2%
*“In addition they are easy to use and fit great”*
### **What buyers complain about **
**Strength**31%
*“Flimsy and cheaply made”*
**Stain Resistance**17%
*“Arrived dented and with blue stains”*
**Quality-Overall**14%
*“Flimsy and cheaply made”*
**Filtration**8%
*“Doesn't filter out allergies”*
**Adhesion/Stickiness**8%
*“the cheap cardboard 'frame' didn't stay glued”*
**Allergies**8%
*“Doesn't filter out allergies”*
**Assembly/Installation**6%
*“not put together well”*
### **Top return reasons **
**Size-Overall**67%
**Filtration**16%
**Compatibility-Overall**4%
**Value For Money**3%
**Advertised Vs Actual Product**2%
**Defective Material/Parts**1%
**Functionality-Overall**1%
**Certifications**1%
**Maintenance And Repair**1%
**Strength**1%
## **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.
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