The Best Energy-efficient Air Conditioner (And 305 Other Models) As Of October, 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?
- 8,428 ratings were analyzed across 3 sources, resulting in a 9.3/10 average.
- Chosen by AlphaBot as being the most likely best choice energy-efficient air conditioner for 2024 at this point
- 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?
- 8,428 ratings were analyzed across 3 sources, resulting in a 9.3/10 average.
- Chosen by AlphaBot as being the most likely best choice energy-efficient air conditioner for 2024 at this point
- 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
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?
- 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?
- 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?
- 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?
- 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
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?
- 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?
- 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?
- 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?
- 17 ratings were analyzed across 2 sources, resulting in a 8/10 average.
12000
BTU
cooling
58
db
Max. Noise
18.6
in.
Width
450
Sq. Ft.
Cool area
- Energy Star Compliant
- Remote control
- 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
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
8000
BTU
cooling
69
-dollar
annual cost
350
Sq. Ft.
Cool area
- Energy Star Compliant
- Remote control
- 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
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
6000
BTU
cooling
53
-dollar
annual cost
15.98
in.
Width
250
Sq. Ft.
Cool area
- Energy Star Compliant
- Remote control
- Energy Star Compliant
- Remote control
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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