The 9 Best 21-inch Window Air Conditioners February, 2025 (And 2 Other Models)
AlphaChooser's list of 21-inch-wide window air conditioners includes only units that are between 20 and 21.5-inch wide and lists the best ones, according to our unique ranking system.
The List :
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#1 Best Model 2025: Tosot Tranquility 8000 BTU
21.4
-inch
wide
14
in.
high
8000
BTU
Cool rating
42
dB
Noise Level
- Window Mounting Kit
- Energy Star Compliant
- Remote control
- Fits 115-120V Power Outlets
- Window Mounting Kit
- Energy Star Compliant
- Remote control
- Fits 115-120V Power Outlets
You Should Also Check Out: Top 10 Best 8000 BTU Window Air Conditioners 2025
#2 Second Best: Tosot Chalet 8000-BTU
21
-inch
wide
12.75
in.
high
8000
BTU
Cool rating
65
dB
Noise Level
- Window Mounting Kit
- Energy Star Compliant
- Remote control
- Fits 115-120V Power Outlets
Why The Tosot Chalet 8000-BTU?
- 3,612 ratings were analyzed across 3 sources, resulting in a 8.8/10 average.
- Window Mounting Kit
- Energy Star Compliant
- Remote control
- Fits 115-120V Power Outlets
Why The Tosot Chalet 8000-BTU?
- 3,612 ratings were analyzed across 3 sources, resulting in a 8.8/10 average.
You Should Also Check Out: Top 10 Best Low-profile Air Conditioners 2025
#3 Also Good: Tosot Chalet 12000 BTU 21-inch Wide Air Conditioner
21.38
-inch
wide
15.75
in.
high
12000
BTU
Cool rating
65
dB
Noise Level
- Energy Star Compliant
- Remote control
- Fits 115-120V Power Outlets
Why The Tosot Chalet 12000 BTU?
- 2,939 ratings were analyzed across 2 sources, resulting in a 8.8/10 average.
- Energy Star Compliant
- Remote control
- Fits 115-120V Power Outlets
Why The Tosot Chalet 12000 BTU?
- 2,939 ratings were analyzed across 2 sources, resulting in a 8.8/10 average.
You Should Also Check Out: Top 10 Best 12000 BTU Window Air Conditioners 2025
#4 Also Good: Tosot Chalet 10000-BTU 21-inch Wide Air Conditioner
21.38
-inch
wide
15.75
in.
high
10000
BTU
Cool rating
65
dB
Noise Level
- Window Mounting Kit
- Energy Star Compliant
- Remote control
- Fits 115-120V Power Outlets
Why The Tosot Chalet 10000-BTU?
- 3,079 ratings were analyzed across 2 sources, resulting in a 8.8/10 average.
- Window Mounting Kit
- Energy Star Compliant
- Remote control
- Fits 115-120V Power Outlets
Why The Tosot Chalet 10000-BTU?
- 3,079 ratings were analyzed across 2 sources, resulting in a 8.8/10 average.
You Should Also Check Out: Top 10 Best 10000 BTU Window Air Conditioners 2025
#5 Also Good: Haier QHEK14AC
20.1
-inch
wide
15
in.
high
14000
BTU
Cool rating
54
dB
Noise Level
- Window Mounting Kit
- Wi-Fi Enabled
- Alexa-compatible
- Remote control
- Fits 115-120V Power Outlets
- Window Mounting Kit
- Wi-Fi Enabled
- Alexa-compatible
- Remote control
- Fits 115-120V Power Outlets
You Should Also Check Out: Top 10 Best 110V-120V Window Air Conditioners 2025
#6 Also Good: Haier ESAQ406T
21.25
-inch
wide
12.44
in.
high
6000
BTU
Cool rating
12.2
EER
- Window Mounting Kit
- Energy Star Compliant
- Remote control
- Fits 115-120V Power Outlets
Why The Haier ESAQ406T?
- 2,988 ratings were analyzed across 5 sources, resulting in a 8.7/10 average.
- Window Mounting Kit
- Energy Star Compliant
- Remote control
- Fits 115-120V Power Outlets
Why The Haier ESAQ406T?
- 2,988 ratings were analyzed across 5 sources, resulting in a 8.7/10 average.
You Should Also Check Out: Top 10 Best 6000 BTU Window Air Conditioners 2025
#7 Also Good: GE PHC08LY
21.25
-inch
wide
12.44
in.
high
8100
BTU
Cool rating
43
dB
Noise Level
- Window Mounting Kit
- Wi-Fi Enabled
- Alexa-compatible
- Remote control
- Fits 115-120V Power Outlets
- Window Mounting Kit
- Wi-Fi Enabled
- Alexa-compatible
- Remote control
- Fits 115-120V Power Outlets
You Should Also Check Out: Top 10 Best Quiet Air Conditioners 2025
#8 Also Good: Paris Rhone AC003
21
-inch
wide
18
in.
high
8000
BTU
Cool rating
43
dB
Noise Level
- Window Mounting Kit
- Remote control
- Fits 115-120V Power Outlets
Why The Paris Rhone AC003?
- 53 ratings were analyzed across 2 sources, resulting in a 8.1/10 average.
- Window Mounting Kit
- Remote control
- Fits 115-120V Power Outlets
Why The Paris Rhone AC003?
- 53 ratings were analyzed across 2 sources, resulting in a 8.1/10 average.
#9 Also Good: GE PHC06LY
21.25
-inch
wide
12.44
in.
high
6150
BTU
Cool rating
52
$
Annual Cost
- Window Mounting Kit
- Wi-Fi Enabled
- Alexa-compatible
- Remote control
- Fits 115-120V Power Outlets
Why The GE PHC06LY?
- 909 ratings were analyzed across 2 sources, resulting in a 8.2/10 average.
- Window Mounting Kit
- Wi-Fi Enabled
- Alexa-compatible
- Remote control
- Fits 115-120V Power Outlets
Why The GE PHC06LY?
- 909 ratings were analyzed across 2 sources, resulting in a 8.2/10 average.
You Should Also Check Out: Top 10 Best Smart Air Conditioners 2025
3 More 21-inch window air conditioners, Sorted By The Latest Model First:
21.2
-inch
wide
12.4
in.
high
8000
BTU
Cool rating
51
dB
Noise Level
- Window Mounting Kit
- Wi-Fi Enabled
- Remote control
- Fits 115-120V Power Outlets
Why The GE AHEL08BB?
- 8 ratings were analyzed across 2 sources, resulting in a 8.2/10 average.
- Window Mounting Kit
- Wi-Fi Enabled
- Remote control
- Fits 115-120V Power Outlets
Why The GE AHEL08BB?
- 8 ratings were analyzed across 2 sources, resulting in a 8.2/10 average.
You Should Also Check Out: Top 10 Best 22-inch Window Air Conditioners 2025
21.2
-inch
wide
12.4
in.
high
42
dB
Noise Level
- Window Mounting Kit
- Remote control
- Fits 115-120V Power Outlets
- Window Mounting Kit
- Remote control
- Fits 115-120V Power Outlets
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