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The Best Energy-efficient Air Conditioner (And 305 Other Models) As Of July, 2024

This list made of the latest energy-efficient air conditioners includes only air conditioners that satisfy these specs:
  • They must have an energy-efficiency ratio (EER) of 11 or above, which is kind of rare, and a similar combined energy-efficiency ratio (CEER)
  • They may, but do not necessarily have to be Energy-Star accredited
  • When not specified, Energy Star efficiency ratings specified in annual cost are generally based on a 12 cents per Kwh electricty rate and 8-hour-per-day use over 3 months)

The List :
Advertising disclosure
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#1 Best Model 2024: Senville SENL/18CD

18000
BTU
cooling
18000
BTU
heating
30.5
db
Min. Noise
43
db
Max. Noise
  • 5-year Warranty
  • Energy Star Compliant
  • Remote control
  • With Built-in Heater
  • Removable Water Tank
  • Fits 230-240V Power Outlets
Why The Senville SENL/18CD?
  1. 8,428 ratings were analyzed across 3 sources, resulting in a 9.3/10 average.
  2. Chosen by AlphaBot as being the most likely best choice energy-efficient air conditioner for 2024 at this point
  3. Learn About Our Very Special Ranking System


  • 5-year Warranty
  • Energy Star Compliant
  • Remote control
  • With Built-in Heater
  • Removable Water Tank
  • Fits 230-240V Power Outlets
Why The Senville SENL/18CD?
  1. 8,428 ratings were analyzed across 3 sources, resulting in a 9.3/10 average.
  2. Chosen by AlphaBot as being the most likely best choice energy-efficient air conditioner for 2024 at this point
  3. Learn About Our Very Special Ranking System

306 More energy-efficient air conditioners, Sorted By The Latest Model First:

9000
BTU
cooling
9000
BTU
heating
26.5
db
Min. Noise
41
db
Max. Noise
  • Energy Star Compliant
  • Wi-Fi Enabled
  • Remote control
  • With Built-in Heater
  • Fits 230-240V Power Outlets

  • Energy Star Compliant
  • Wi-Fi Enabled
  • Remote control
  • With Built-in Heater
  • Fits 230-240V Power Outlets
You Should Also Check Out: Top 10 Best Split Air Conditioners 2024
12000
BTU
cooling
19.88
in.
Width
550
Sq. Ft.
Cool area
  • Energy Star Compliant
  • Wi-Fi Enabled
  • Fits 115-120V Power Outlets
Why The Friedrich CCF12B10A?
  1. 23 ratings were analyzed across 2 sources, resulting in a 7.7/10 average.


  • Energy Star Compliant
  • Wi-Fi Enabled
  • Fits 115-120V Power Outlets
Why The Friedrich CCF12B10A?
  1. 23 ratings were analyzed across 2 sources, resulting in a 7.7/10 average.

9500
BTU
cooling
21.38
in.
Width
250
CFM
Max. Air flow
450
Sq. Ft.
Cool area
  • Energy Star Compliant
  • Wi-Fi Enabled
  • Fits 115-120V Power Outlets

  • Energy Star Compliant
  • Wi-Fi Enabled
  • Fits 115-120V Power Outlets
10000
BTU
cooling
29
in.
Width
300
CFM
Max. Air flow
450
Sq. Ft.
Cool area
  • Energy Star Compliant
  • Wi-Fi Enabled
  • Remote control
  • Fits 115-120V Power Outlets

  • Energy Star Compliant
  • Wi-Fi Enabled
  • Remote control
  • Fits 115-120V Power Outlets
17700
BTU
cooling
54
db
Max. Noise
23.6
in.
Width
1000
Sq. Ft.
Cool area
  • Window Mounting Kit
  • Energy Star Compliant
  • Remote control
  • Fits 115-120V Power Outlets
Why The Keystone KSTAW18C?
  1. 43 ratings were analyzed across 3 sources, resulting in a 6.6/10 average.


  • Window Mounting Kit
  • Energy Star Compliant
  • Remote control
  • Fits 115-120V Power Outlets
Why The Keystone KSTAW18C?
  1. 43 ratings were analyzed across 3 sources, resulting in a 6.6/10 average.

19.75
in.
Width
200
CFM
Max. Air flow
250
Sq. Ft.
Cool area
  • 5-year Warranty
  • Through-the-wall Installation
  • Window Mounting Kit
  • Energy Star Compliant
  • Wi-Fi Enabled
  • Alexa-compatible
  • Remote control
  • Fits 115-120V Power Outlets

  • 5-year Warranty
  • Through-the-wall Installation
  • Window Mounting Kit
  • Energy Star Compliant
  • Wi-Fi Enabled
  • Alexa-compatible
  • Remote control
  • Fits 115-120V Power Outlets
You Should Also Check Out: Top 10 Best Wall Air Conditioners 2024
15100
BTU
cooling
52.5
db
Min. Noise
23.6
in.
Width
700
Sq. Ft.
Cool area
  • Energy Star Compliant
  • Remote control
  • Fits 115-120V Power Outlets
Why The Keystone KSTAW15CE?
  1. 291 ratings were analyzed across 3 sources, resulting in a 8.6/10 average.


  • Energy Star Compliant
  • Remote control
  • Fits 115-120V Power Outlets
Why The Keystone KSTAW15CE?
  1. 291 ratings were analyzed across 3 sources, resulting in a 8.6/10 average.

60
db
Max. Noise
19
in.
Width
550
Sq. Ft.
Cool area
  • Window Mounting Kit
  • Energy Star Compliant
  • Remote control
  • Fits 115-120V Power Outlets
Why The Perfect Aire 6PAC12000?
  1. 17 ratings were analyzed across 2 sources, resulting in a 8/10 average.


  • Window Mounting Kit
  • Energy Star Compliant
  • Remote control
  • Fits 115-120V Power Outlets
Why The Perfect Aire 6PAC12000?
  1. 17 ratings were analyzed across 2 sources, resulting in a 8/10 average.

  • Energy Star Compliant
  • Remote control
5000
BTU
cooling
54
db
Max. Noise
16
in.
Width
150
Sq. Ft.
Cool area
  • Energy Star Compliant
  • Fits 115-120V Power Outlets

  • Energy Star Compliant
  • Fits 115-120V Power Outlets
9000
BTU
cooling
25
db
Min. Noise
350
Sq. Ft.
Cool area
  • 12-year Warranty
  • Energy Star Compliant
  • Remote control
  • Fits 230-240V Power Outlets

  • 12-year Warranty
  • Energy Star Compliant
  • Remote control
  • Fits 230-240V Power Outlets
18000
BTU
cooling
25
db
Min. Noise
1000
Sq. Ft.
Cool area
  • 12-year Warranty
  • Energy Star Compliant
  • Remote control
  • Fits 230-240V Power Outlets

  • 12-year Warranty
  • Energy Star Compliant
  • Remote control
  • Fits 230-240V Power Outlets
18000
BTU
cooling
25
db
Min. Noise
1500
Sq. Ft.
Cool area
  • 12-year Warranty
  • Energy Star Compliant
  • Remote control
  • Fits 230-240V Power Outlets

  • 12-year Warranty
  • Energy Star Compliant
  • Remote control
  • Fits 230-240V Power Outlets
15000
BTU
cooling
52
db
Min. Noise
23.6
in.
Width
700
Sq. Ft.
Cool area
  • Window Mounting Kit
  • Energy Star Compliant
  • Wi-Fi Enabled
  • Alexa-compatible
  • Remote control
  • Fits 115-120V Power Outlets

  • Window Mounting Kit
  • Energy Star Compliant
  • Wi-Fi Enabled
  • Alexa-compatible
  • Remote control
  • Fits 115-120V Power Outlets
You Should Also Check Out: Top 10 Best Smart Air Conditioners 2024
15000
BTU
cooling
52
db
Min. Noise
23.6
in.
Width
700
Sq. Ft.
Cool area
  • 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
12000
BTU
cooling
25
db
Min. Noise
46
db
Max. Noise
  • 12-year Warranty
  • Energy Star Compliant
  • Remote control
  • Fits 230-240V Power Outlets

  • 12-year Warranty
  • Energy Star Compliant
  • Remote control
  • Fits 230-240V Power Outlets
18000
BTU
cooling
25
db
Min. Noise
36
db
Max. Noise
38
in.
Width
  • Energy Star Compliant
  • Wi-Fi Enabled
  • Fits 230-240V Power Outlets

  • Energy Star Compliant
  • Wi-Fi Enabled
  • Fits 230-240V Power Outlets
24000
BTU
cooling
18000
BTU
heating
25
db
Min. Noise
36.5
db
Max. Noise
  • Energy Star Compliant
  • Wi-Fi Enabled
  • Remote control
  • With Built-in Heater
  • Fits 230-240V Power Outlets

  • Energy Star Compliant
  • Wi-Fi Enabled
  • Remote control
  • With Built-in Heater
  • Fits 230-240V Power Outlets
9000
BTU
cooling
25
db
Min. Noise
30.31
in.
Width
1176.47
CFM
Max. Air flow
  • Energy Star Compliant
  • Wi-Fi Enabled
  • Remote control
  • Fits 115-120V Power Outlets

  • Energy Star Compliant
  • Wi-Fi Enabled
  • Remote control
  • Fits 115-120V Power Outlets
18000
BTU
cooling
18000
BTU
heating
25
db
Min. Noise
18000
BTU
Heating
  • Energy Star Compliant
  • Wi-Fi Enabled
  • Remote control
  • With Built-in Heater
  • Fits 230-240V Power Outlets

  • Energy Star Compliant
  • Wi-Fi Enabled
  • Remote control
  • With Built-in Heater
  • Fits 230-240V Power Outlets
9000
BTU
cooling
10900
BTU
heating
24
db
Min. Noise
40.5
db
Max. Noise
  • 5-year Warranty
  • Energy Star Compliant
  • Alexa-compatible
  • Remote control
  • With Built-in Heater
  • Fits 115-120V Power Outlets

  • 5-year Warranty
  • Energy Star Compliant
  • Alexa-compatible
  • Remote control
  • With Built-in Heater
  • Fits 115-120V Power Outlets
12000
BTU
cooling
1200
BTU
heating
32
db
Min. Noise
38
db
Max. Noise
  • Energy Star Compliant
  • With Built-in Heater
  • Fits 230-240V Power Outlets

  • Energy Star Compliant
  • With Built-in Heater
  • Fits 230-240V Power Outlets
12000
BTU
cooling
57.7
db
Min. Noise
550
Sq. Ft.
Cool area
  • 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
27000
BTU
cooling
28000
BTU
heating
28000
BTU
Heating
37.25
in.
Width
  • Energy Star Compliant
  • Remote control
  • With Built-in Heater

  • Energy Star Compliant
  • Remote control
  • With Built-in Heater
15000
BTU
cooling
52.5
db
Min. Noise
23.6
in.
Width
353
CFM
Max. Air flow
  • 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
9000
BTU
cooling
24
db
Min. Noise
40
db
Max. Noise
35.2
in.
Width
  • 5-year Warranty
  • Energy Star Compliant
  • Remote control
  • Fits 115-120V Power Outlets

  • 5-year Warranty
  • Energy Star Compliant
  • Remote control
  • Fits 115-120V Power Outlets
17000
BTU
cooling
18000
BTU
heating
18000
BTU
Heating
28.53
in.
Width
  • Energy Star Compliant
  • Remote control
  • With Built-in Heater
  • Fits 230-240V Power Outlets

  • Energy Star Compliant
  • Remote control
  • With Built-in Heater
  • Fits 230-240V Power Outlets
12000
BTU
cooling
11800
BTU
heating
24
db
Min. Noise
43
db
Max. Noise
  • Energy Star Compliant
  • Wi-Fi Enabled
  • Remote control
  • With Built-in Heater
  • Fits 230-240V Power Outlets

  • Energy Star Compliant
  • Wi-Fi Enabled
  • Remote control
  • With Built-in Heater
  • Fits 230-240V Power Outlets
15000
BTU
cooling
23.8
in.
Width
400
CFM
Max. Air flow
  • Window Mounting Kit
  • Energy Star Compliant
  • Wi-Fi Enabled
  • Alexa-compatible
  • Remote control
  • Fits 115-120V Power Outlets

  • Window Mounting Kit
  • Energy Star Compliant
  • Wi-Fi Enabled
  • Alexa-compatible
  • Remote control
  • Fits 115-120V Power Outlets
10000
BTU
cooling
54
db
Min. Noise
59
db
Max. Noise
19.76
in.
Width
  • Window Mounting Kit
  • Energy Star Compliant
  • Wi-Fi Enabled
  • Alexa-compatible
  • Remote control
  • Dehumidification Mode
  • Fits 115-120V Power Outlets

  • Window Mounting Kit
  • Energy Star Compliant
  • Wi-Fi Enabled
  • Alexa-compatible
  • Remote control
  • Dehumidification Mode
  • Fits 115-120V Power Outlets
8000
BTU
cooling
4200
BTU
heating
4200
BTU
Heating
61
-dollar
annual cost
  • Through-the-wall Installation
  • Energy Star Compliant
  • Wi-Fi Enabled
  • With Built-in Heater
  • Fits 115-120V Power Outlets

  • Through-the-wall Installation
  • Energy Star Compliant
  • Wi-Fi Enabled
  • With Built-in Heater
  • Fits 115-120V Power Outlets
10000
BTU
cooling
95
-dollar
annual cost
19.75
in.
Width
300
CFM
Max. Air flow
  • Through-the-wall Installation
  • Energy Star Compliant
  • Wi-Fi Enabled
  • Remote control
  • Fits 115-120V Power Outlets

  • Through-the-wall Installation
  • Energy Star Compliant
  • Wi-Fi Enabled
  • Remote control
  • Fits 115-120V Power Outlets
18000
BTU
cooling
149
-dollar
annual cost
23.88
in.
Width
520
CFM
Max. Air flow
  • Through-the-wall Installation
  • Energy Star Compliant
  • Wi-Fi Enabled
  • Remote control
  • Fits 230-240V Power Outlets

  • Through-the-wall Installation
  • Energy Star Compliant
  • Wi-Fi Enabled
  • Remote control
  • Fits 230-240V Power Outlets
12000
BTU
cooling
11800
BTU
heating
24
db
Min. Noise
43
db
Max. Noise
  • Energy Star Compliant
  • Remote control
  • With Built-in Heater
  • Fits 230-240V Power Outlets

  • Energy Star Compliant
  • Remote control
  • With Built-in Heater
  • Fits 230-240V Power Outlets
10000
BTU
cooling
83
-dollar
annual cost
21.3
in.
Width
460
Sq. Ft.
Cool area
  • 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
  • Energy Star Compliant
  • Remote control
15100
BTU
cooling
53
db
Min. Noise
56
db
Max. Noise
125
-dollar
annual cost
  • 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
5000
BTU
cooling
51
db
Min. Noise
56
db
Max. Noise
40
-dollar
annual cost
  • 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
10000
BTU
cooling
54
db
Min. Noise
59
db
Max. Noise
81
-dollar
annual cost
  • 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
12000
BTU
cooling
10600
BTU
heating
10600
BTU
Heating
96
-dollar
annual cost
  • Through-the-wall Installation
  • Energy Star Compliant
  • Wi-Fi Enabled
  • With Built-in Heater
  • Fits 230-240V Power Outlets

  • Through-the-wall Installation
  • Energy Star Compliant
  • Wi-Fi Enabled
  • With Built-in Heater
  • Fits 230-240V Power Outlets
5000
BTU
cooling
50.5
db
Min. Noise
56.2
db
Max. Noise
44
-dollar
annual cost
  • Energy Star Compliant
  • Remote control
  • Fits 115-120V Power Outlets

  • Energy Star Compliant
  • Remote control
  • Fits 115-120V Power Outlets
5000
BTU
cooling
51
db
Min. Noise
55
db
Max. Noise
44
-dollar
annual cost
  • 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
12000
BTU
cooling
55
db
Max. Noise
19.76
in.
Width
550
Sq. Ft.
Cool area
  • 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
18000
BTU
cooling
33.25
in.
Width
  • Energy Star Compliant
  • Remote control

  • Energy Star Compliant
  • Remote control
8000
BTU
cooling
42
db
Min. Noise
49
db
Max. Noise
21.4
in.
Width
  • 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 Quiet Air Conditioners 2024
5000
BTU
cooling
50.5
db
Min. Noise
40
-dollar
annual cost
16
in.
Width
  • Energy Star Compliant
  • Remote control
  • Fits 115-120V Power Outlets

  • Energy Star Compliant
  • Remote control
  • Fits 115-120V Power Outlets
6000
BTU
cooling
53
-dollar
annual cost
18.59
in.
Width
177
CFM
Max. Air flow
  • Window Mounting Kit
  • Energy Star Compliant
  • Fits 115-120V Power Outlets

  • Window Mounting Kit
  • Energy Star Compliant
  • Fits 115-120V Power Outlets
12000
BTU
cooling
12000
BTU
heating
24
db
Min. Noise
38
db
Max. Noise
  • Energy Star Compliant
  • Remote control
  • Dehumidification Mode
  • With Built-in Heater
  • Fits 230-240V Power Outlets

  • Energy Star Compliant
  • Remote control
  • Dehumidification Mode
  • With Built-in Heater
  • Fits 230-240V Power Outlets
8000
BTU
cooling
5614
db
Min. Noise
60
db
Max. Noise
65
-dollar
annual cost
  • Window Mounting Kit
  • Energy Star Compliant
  • Remote control

  • Window Mounting Kit
  • Energy Star Compliant
  • Remote control
8000
BTU
cooling
53.3
db
Min. Noise
57.7
db
Max. Noise
18.5
in.
Width
  • 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


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