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LG S12ER Review | 46 Data compared

Avg. price:~£360Cooling capacity:2.5 kWSeasonal cooling efficiency (SEER):6.5Maximum indoor-unit sound power level:59 dB

LG S12ER Review: Compare 46 technical specifications and user reviews to see how this product ranks in the Air Conditioners category and whether it is worth buying.

LG S12ER
7.1/10

Overall score

Score
7.1/ 10
✕
What it is
An overall evaluation of products in the Air Conditioners category, based on technical analysis and user reviews.
When it matters
When you need a quick reference for identifying the best products in the Air Conditioners category.
Score distribution
â–¼
<55-66-77-88-99-10
â–¼ Worse than 79% of models
Score components

80%

6.9

Technical score

20%

8.2

User score

â–¼Worse than 79% of air conditioners
7.2

Value for money

Value for money
7.2/ 10
✕
What it is
An indicator that combines the overall score of products in the Air Conditioners category with their prices.
When it matters
When you are comparing products in the Air Conditioners category and want a good balance between quality and price.
Score distribution
â–¼
<55-66-77-88-99-10
â–² Better than 52% of models
Score components

70%

7.1

Overall score

30%

7.4

Price

â–²Better than 52%
6.9

Technical score

Technical score
6.9/ 10
✕
What it is
An assessment of technical performance for products in the Air Conditioners category across these key areas: Performance, Features, Design.
When it matters
When you want to compare products in the Air Conditioners category by technical performance, specifications, and available features.
Score distribution
â–¼
<55-66-77-88-99-10
â–¼ Worse than 85% of models
Score components

40%

4.0

Performance

40%

8.6

Features

20%

9.1

Design

â–¼Worse than 85%
8.2

User score

User score
8.2/ 10
✕
What it is
A rating that combines user reviews with the total review volume for products in the Air Conditioners category.
When it matters
When you want to know how products in the Air Conditioners category perform in everyday use and how reliable owners find them over time.
Score distribution
â–¼
<55-66-77-88-99-10
â–² Better than 78% of models
Score components

70%

8.4

User ratings

30%

7.9

Number of reviews

Based on ratings from across the web.
â–²Better than 78%
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Technical Specifications of air conditioner LG S12ER

Technical score
Technical score
6.9/ 10
✕
What it is
An assessment of technical performance for products in the Air Conditioners category across these key areas: Performance, Features, Design.
When it matters
When you want to compare products in the Air Conditioners category by technical performance, specifications, and available features.
Score distribution
â–¼
<55-66-77-88-99-10
â–¼ Worse than 85% of models
Score components:

40%

4.0

Performance

40%

8.6

Features

20%

9.1

Design

6.9
User score
User score
8.2/ 10
✕
What it is
A rating that combines user reviews with the total review volume for products in the Air Conditioners category.
When it matters
When you want to know how products in the Air Conditioners category perform in everyday use and how reliable owners find them over time.
Score distribution
â–¼
<55-66-77-88-99-10
â–² Better than 78% of models
Score components

70%

8.4

User ratings

30%

7.9

Number of reviews

Based on ratings from across the web.
8.2
Popularity
Popularity
7.9/ 10
✕
What it is
An indicator based on the number of reviews received by products in the Air Conditioners category.
When it matters
When you prefer products in the Air Conditioners category that have been chosen and reviewed by many other buyers.
Score distribution
â–¼
<55-66-77-88-99-10
â–² Better than 76% of models
Popularity:
LG S12ER has a popularity score of 7.9 points, which is higher than 76.4% of products in this category.
7.9
Value for money
Value for money
7.2/ 10
✕
What it is
An indicator that combines the overall score of products in the Air Conditioners category with their prices.
When it matters
When you are comparing products in the Air Conditioners category and want a good balance between quality and price.
Score distribution
â–¼
<55-66-77-88-99-10
â–² Better than 52% of models
Score components:

70%

7.1

Overall score

30%

7.4

Price

7.2
Split configuration
mono split
Cooling capacity
2.5 kW
Market range: <2.5 kW – >5.5 kW
This air conditioner delivers a cooling capacity of 2.5 kW, which is lower than that of 88.8% of air conditioners and the same as that of 10% of air conditioners.
Indoor-unit capacity configuration
12,000 BTU/h
Seasonal cooling efficiency (SEER)
6.5
Market range: <6 – >7.5
This air conditioner has a SEER rating of 6.5, which is higher than that of 62.2% of air conditioners and the same as that of 4.5% of air conditioners.
Seasonal heating efficiency (SCOP)
4
Market range: <4 – >5
This air conditioner has a SCOP rating of 4, which is higher than that of 4.4% of air conditioners and the same as that of 49.4% of air conditioners.
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Inverter compressor
yes
Does this air conditioner use an inverter compressor? yes. 12.4% of air conditioners do, while 87.6% do not.
Heating function
yes
Can this air conditioner heat the room? yes. 7.3% of air conditioners can, while 92.7% cannot.
Active air purification
no
Does this air conditioner actively purify the air? no. 27% of air conditioners do not, while 73.1% do.
Dehumidification mode
yes
Does this air conditioner include dehumidification mode? yes. 6.8% of air conditioners do, while 93.2% do not.
Fan-only mode
yes
Does this air conditioner offer fan-only mode? yes. 6.2% of air conditioners do, while 93.8% do not.
Show more
Color
white
Body material
plastic
Display
yes
This air conditioner includes a display (yes); 18% of air conditioners do not, while 82% do.
Display position
front right
Physical control methods
remote control and onboard controls
This air conditioner provides remote control and onboard controls physical controls, ahead of 83.2% of air conditioners and equal to 16.9%.
Show more

LG S12ER vs the average air conditioner

246810TotalPerformanceFeaturesDesign
  • 3 more fan speeds
    This air conditioner provides more fan speed options than the average air conditioner (6 vs 3).
    6 vs 3
  • Broader physical control options
    For physical control setup, this air conditioner lists remote control and onboard controls, while the average air conditioner lists remote control.
    remote control and onboard controls vs remote control
  • 1.6 cm shallower indoor unit
    This air conditioner has a shallower indoor unit than the average air conditioner (18.9 cm vs 20.5 cm).
    18.9 cm vs 20.5 cm
  • 95 m³/h higher indoor-unit airflow
    This air conditioner delivers a higher indoor airflow rate than the average air conditioner (690 m³/h vs 595 m³/h).
    690 m³/h vs 595 m³/h
  • 0.2 points higher seasonal cooling efficiency
    This air conditioner achieves a higher seasonal cooling efficiency (SEER) than the average air conditioner (6.5 vs 6.3).
    6.5 vs 6.3
  • 7.88x more popular
    LG S12ER is more popular than the average air conditioner (7.88 vs 1).
    7.88 vs 1
  • 3% higher user score
    User score
    8.2/ 10
    ✕
    What it is
    A rating that combines user reviews with the total review volume for products in the Air Conditioners category.
    When it matters
    When you want to know how products in the Air Conditioners category perform in everyday use and how reliable owners find them over time.
    Score distribution
    â–¼
    â–¼
    <55-66-77-88-99-10
    LG S12ER
    the average air conditioner
    LG S12ER has a higher user score than the average air conditioner (8.24 vs 8.000).
    8.24 vs 8
  • 38.9% cheaper
    LG S12ER is cheaper than the average air conditioner (£360 vs £500).
    £360 vs £500
  • 7.88x more popular
    LG S12ER is more popular than the average air conditioner (7.88 vs 1).
    7.88 vs 1
  • 3% higher user score
    User score
    8.2/ 10
    ✕
    What it is
    A rating that combines user reviews with the total review volume for products in the Air Conditioners category.
    When it matters
    When you want to know how products in the Air Conditioners category perform in everyday use and how reliable owners find them over time.
    Score distribution
    â–¼
    â–¼
    <55-66-77-88-99-10
    LG S12ER
    the average air conditioner
    LG S12ER has a higher user score than the average air conditioner (8.24 vs 8.000).
    8.24 vs 8
  • 38.9% cheaper
    LG S12ER is cheaper than the average air conditioner (£360 vs £500).
    £360 vs £500
  • 1.5% better value for money
    LG S12ER offers better value for money than the average air conditioner (7.22 vs 7.1).
    7.22 vs 7.12
  • 95 m³/h higher indoor-unit airflow
    This air conditioner delivers a higher indoor airflow rate than the average air conditioner (690 m³/h vs 595 m³/h).
    690 m³/h vs 595 m³/h
  • 0.2 points higher seasonal cooling efficiency
    This air conditioner achieves a higher seasonal cooling efficiency (SEER) than the average air conditioner (6.5 vs 6.3).
    6.5 vs 6.3
  • 3 more fan speeds
    This air conditioner provides more fan speed options than the average air conditioner (6 vs 3).
    6 vs 3
  • Broader physical control options
    For physical control setup, this air conditioner lists remote control and onboard controls, while the average air conditioner lists remote control.
    remote control and onboard controls vs remote control
  • 1.6 cm shallower indoor unit
    This air conditioner has a shallower indoor unit than the average air conditioner (18.9 cm vs 20.5 cm).
    18.9 cm vs 20.5 cm
  • 1 kW lower cooling capacity
    This air conditioner delivers a lower cooling capacity than the average air conditioner (2.5 kW vs 3.5 kW).
    2.5 kW vs 3.5 kW
  • Does not support automatic self-cleaning
    This air conditioner does not support automatic self-cleaning, while the average air conditioner supports automatic self-cleaning.
  • 17 hours shorter timer duration
    This air conditioner allows a shorter timer setting than the average air conditioner (7 hours vs 24 hours).
    7 hours vs 24 hours
  • 3 dB higher outdoor sound power
    This air conditioner operates with a louder outdoor unit than the average air conditioner (65 dB vs 62 dB).
    65 dB vs 62 dB
  • 3 dB higher indoor sound power
    This air conditioner operates with a louder indoor unit than the average air conditioner (59 dB vs 56 dB).
    59 dB vs 56 dB
  • 1.8 cm taller indoor unit
    This air conditioner has a taller indoor-unit height than the average air conditioner (30.8 cm vs 29 cm).
    30.8 cm vs 29 cm
  • 8.2 cm wider indoor unit
    This air conditioner has a wider indoor unit than the average air conditioner (88.7 cm vs 80.5 cm).
    88.7 cm vs 80.5 cm
  • 1 kW lower cooling capacity
    This air conditioner delivers a lower cooling capacity than the average air conditioner (2.5 kW vs 3.5 kW).
    2.5 kW vs 3.5 kW
  • 3 dB higher outdoor sound power
    This air conditioner operates with a louder outdoor unit than the average air conditioner (65 dB vs 62 dB).
    65 dB vs 62 dB
  • 3 dB higher indoor sound power
    This air conditioner operates with a louder indoor unit than the average air conditioner (59 dB vs 56 dB).
    59 dB vs 56 dB
  • Does not support automatic self-cleaning
    This air conditioner does not support automatic self-cleaning, while the average air conditioner supports automatic self-cleaning.
  • 17 hours shorter timer duration
    This air conditioner allows a shorter timer setting than the average air conditioner (7 hours vs 24 hours).
    7 hours vs 24 hours
  • 1.8 cm taller indoor unit
    This air conditioner has a taller indoor-unit height than the average air conditioner (30.8 cm vs 29 cm).
    30.8 cm vs 29 cm
  • 8.2 cm wider indoor unit
    This air conditioner has a wider indoor unit than the average air conditioner (88.7 cm vs 80.5 cm).
    88.7 cm vs 80.5 cm

Third-party reviews

Based on ratings from across the web.
Reviews last updated: August 2026 · How we calculate this

What we like about LG S12ER

  • Efficient energy usage due to the built-in Smart Inverter technology
  • Rapid room cooling capability, especially when deploying the high-powered performance modes
  • Extremely quiet indoor unit operation, measuring around 30 decibels on lower settings
  • Versatile functionality offering dedicated cooling, dehumidification, and heat-pump heating
  • Convenient user features such as Comfort Air airflow diversion and an auto-cleaning cycle

What we don't like about LG S12ER

  • The physical remote control lacks a backlight, making it difficult to operate in dark rooms
  • Requires an optional separate hardware purchase or setup to unlock full Wi-Fi smart control functionality
  • The outdoor compressor unit can become noticeably louder when running at maximum capacity

Verdict

The LG S12ER is a wall-mounted split-system air conditioner and heat pump featuring a 3.5 kW cooling capacity (12,000 BTU) and a 4.0 kW heating capacity, utilizing eco-friendly R32 refrigerant. Powered by an energy-efficient Dual Inverter Compressor, it achieves an impressive A++ energy rating for cooling and an A+ rating for heating, while operating at a whisper-quiet sleep mode noise level as low as 19 dB(A). Key advantages include its Active Energy Control for multi-level power optimization, Jet Cool technology for rapid temperature drops, auto-cleaning functionality to prevent mold, and integrated Wi-Fi connectivity for smart control via the ThinQ app. However, a notable disadvantage is that its performance and maximum airflow can drop slightly during extreme low-ambient outdoor temperatures, and the unit requires professional, multi-person installation due to the heavy split-system configuration.

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