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KESSER Split 12000 BTU Review | 46 Data compared

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  • Avg. price in UK: ~£500
  • Avg. price in US: ~$610
  • Cooling capacity: 3.4 kW
  • Seasonal cooling efficiency (SEER): 6.1
  • Maximum indoor-unit sound power level: 50 dB

KESSER Split 12000 BTU 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.

7.8

Overall score

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 components:

80.0%

7.8

Technical Score

20.0%

?

User score

Very good
7.8

Technical Score

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 components:

40.0%

5.9

Performance

40.0%

8.9

Features

20.0%

9.4

Design

Very good
?

User score

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 components:

70.0%

?

User reviews

30.0%

?

Popularity

  • 9.5
    Compactness

    Score components:

    30.0%

    10

    Indoor unit width

    30.0%

    9.5

    Indoor unit depth

    20.0%

    10

    Indoor unit height

    20.0%

    ?

    Indoor unit weight

  • 8.3
    Bedroom comfort

    Score components:

    40.0%

    ?

    Night mode

    25.0%

    ?

    Timer

    20.0%

    ?

    Maximum timer duration

    15.0%

    10

    Automatic mode

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Best prices in UK

    N/A~ £500

Best rankings

?

Available: ranking among products currently available (including other versions of this product).
All: ranking among all products in the database.

Verdict

The KESSER Split 12000 BTU (3,400 Watts) air conditioner features an energy-efficient DC Full-Inverter compressor pre-charged with eco-friendly R32 refrigerant, delivering a strong airflow of 550 m³/h with an A++ cooling and A+ heating efficiency rating. This versatile system includes integrated WiFi/App functionality, an illuminated LCD remote control, a 24-hour timer, and a protective Golden-Fin anti-bacterial coating on both the indoor and outdoor units to prevent residue build-up. Main advantages include its quick-connect installation technology, ultra-quiet operation at low decibels, and multi-functional capability as an air cooler, heater, and dehumidifier. However, potential drawbacks include strict EU regulations requiring documented professional certification prior to purchase, and users may occasionally experience brief operational delays or the necessity of installing a dedicated electrical line to prevent blown fuses during high load spikes.

Technical Specifications of air conditioner KESSER Split 12000 BTU

Technical Score

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 components:

40.0%

?

Performance

40.0%

?

Features

20.0%

?

Design

7.8
KESSER Split 12000 BTU has a technical score of 7.79 points, which is higher than 71.9% of products in this category.
User score

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 components:

70.0%

0.0

User reviews

30.0%

1.0

Popularity

?
Popularity
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.
1.0
KESSER Split 12000 BTU has a popularity of 1 points, which is higher than 0% of products in this category.
Ratio quality/price

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 components:

60.0%

7.8

Overall score

40.0%

6.0

Price

7.3
KESSER Split 12000 BTU has a quality-to-price ratio of 7.3 points, which is higher than 62.4% of products in this category.
Split configuration
What it is: Split configuration states how many indoor units are paired with the air-conditioning system, such as mono, dual, triple, quad, or penta split.
When it matters: It matters when you are planning climate control for one room or several rooms from a shared outdoor unit.

Importance: LOW

mono split
Cooling capacity
What it is: Cooling capacity is the rate at which the air conditioner can remove heat from a room, expressed in kilowatts.
When it matters: Adequate capacity is essential for cooling the intended room size without excessive run time or poor temperature control.

Importance: HIGH

Good value: At least 3.5 kW

3.4 kW
KESSER Split 12000 BTU delivers a cooling capacity of 3.4 kW, which is lower than that of 54.7% of air conditioners and the same as that of 10% of air conditioners.
Indoor-unit capacity configuration
What it is: Indoor-unit capacity configuration shows how the system’s BTU/h capacity is distributed across its indoor units.
When it matters: It matters when sizing a multi-split system for rooms with different cooling loads.

Importance: LOW

12,000 BTU/h
Seasonal cooling efficiency (SEER)
What it is: SEER expresses the air conditioner’s average cooling efficiency over a typical season.
When it matters: A higher SEER generally means less electricity is needed to deliver the same seasonal cooling.

Importance: HIGH

Good value: At least 6.1

6.1
KESSER Split 12000 BTU has a SEER rating of 6.1, which is lower than that of 62.2% of air conditioners and the same as that of 34% of air conditioners.
Seasonal heating efficiency (SCOP)
What it is: SCOP expresses the air conditioner’s average heating efficiency over a typical season.
When it matters: A higher SCOP generally means less electricity is needed to provide the same seasonal heating.

Importance: HIGH

Good value: At least 4.0

4.6
KESSER Split 12000 BTU has a SCOP rating of 4.6, which is higher than that of 81.7% of air conditioners and the same as that of 10.1% of air conditioners.
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Inverter compressor
What it is: An inverter compressor can vary its operating speed instead of relying only on full-power on and off cycles.
When it matters: Variable compressor output can improve temperature stability, efficiency, and part-load noise.

Importance: HIGH

Good value: yes

yes
Does KESSER Split 12000 BTU use an inverter compressor? yes. 12.4% of air conditioners do, while 87.6% do not.
Heating function
What it is: A heating function reverses or supplements normal operation to warm the room.
When it matters: Heating extends seasonal usefulness and can replace a separate spot heater in mild weather.

Importance: MEDIUM

Good value: yes

yes
Can KESSER Split 12000 BTU heat the room? yes. 7.3% of air conditioners can, while 92.7% cannot.
Active air purification
What it is: Active air purification uses a dedicated treatment function beyond ordinary passive filtration to improve indoor air quality.
When it matters: It is useful when reducing fine particles, allergens, odors, or other airborne contaminants is a priority.

Importance: LOW

Good value: yes

no
Does KESSER Split 12000 BTU actively purify the air? no. 27% of air conditioners do not, while 73.1% do.
Dehumidification mode
What it is: Dehumidification mode removes moisture from room air with reduced emphasis on cooling.
When it matters: This mode improves comfort in humid weather and can help control indoor dampness.

Importance: MEDIUM

Good value: yes

yes
Does KESSER Split 12000 BTU include dehumidification mode? yes. 6.8% of air conditioners do, while 93.2% do not.
Fan-only mode
What it is: Fan-only mode circulates room air without running the refrigeration cycle.
When it matters: This mode provides lower-power airflow when cooling is unnecessary.

Importance: MEDIUM

Good value: yes

yes
Does KESSER Split 12000 BTU offer fan-only mode? yes. 6.2% of air conditioners do, while 93.8% do not.
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Color
What it is: Color identifies the main exterior finish of the indoor unit.
When it matters: Color matters when the indoor unit remains visible and should suit the room decor.

Importance: LOW

black
Body material
What it is: Body material identifies the primary exterior housing material of the indoor unit.
When it matters: Housing material affects appearance, rigidity, cleaning, and resistance to everyday wear.

Importance: LOW

plastic
Display
What it is: A display shows temperature, operating mode, timer, or status information on the indoor unit.
When it matters: A built-in display makes current settings easier to check without opening an app or using the remote.

Importance: LOW

Good value: yes

yes
KESSER Split 12000 BTU includes a display (yes); 18% of air conditioners do not, while 82% do.
Display position
What it is: Display position identifies where the integrated display sits on the indoor or main unit.
When it matters: A well-placed display is easier to read from the usual viewing angle without obstructing the room layout.

Importance: LOW

front right
Physical control methods
What it is: Physical control methods identify the supplied remote and user-facing controls on the unit.
When it matters: Physical controls matter when you want to operate the air conditioner without relying on Wi-Fi, an app, or voice control.

Importance: MEDIUM

Good value: remote control and onboard controls

remote control
KESSER Split 12000 BTU provides remote control physical controls, ahead of 1.1% of air conditioners and equal to 81.5%.
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KESSER Split 12000 BTU vs the average air conditioner

  • 0.6 points higher seasonal heating efficiency
    KESSER Split 12000 BTU achieves a higher seasonal heating efficiency (SCOP) than the average air conditioner (4.6 vs 4).
    What it is: SCOP expresses the air conditioner’s average heating efficiency over a typical season.
    When it matters: A higher SCOP generally means less electricity is needed to provide the same seasonal heating.

    Importance: HIGH

    Good value: At least 4.0

    KESSER Split 12000 BTU achieves a higher seasonal heating efficiency (SCOP) than the average air conditioner (4.6 vs 4).4.6 vs 4
  • 6 dB lower indoor sound power
    KESSER Split 12000 BTU operates with a quieter indoor unit than the average air conditioner (50 dB vs 56 dB).
    What it is: Maximum indoor-unit sound power level measures the greatest acoustic power emitted by the indoor unit.
    When it matters: A lower value supports a quieter room, which is especially useful in bedrooms and workspaces.

    Importance: HIGH

    Good value: Up to 55 dB

    KESSER Split 12000 BTU operates with a quieter indoor unit than the average air conditioner (50 dB vs 56 dB).50 dB vs 56 dB
  • 12 dB lower outdoor sound power
    KESSER Split 12000 BTU operates with a quieter outdoor unit than the average air conditioner (50 dB vs 62 dB).
    What it is: Maximum outdoor-unit sound power level measures the greatest acoustic power emitted by the outdoor unit.
    When it matters: A lower value reduces the likelihood of disturbing neighbours or nearby outdoor spaces.

    Importance: MEDIUM

    Good value: Up to 65 dB

    KESSER Split 12000 BTU operates with a quieter outdoor unit than the average air conditioner (50 dB vs 62 dB).50 dB vs 62 dB
  • 11.5 cm narrower indoor unit
    KESSER Split 12000 BTU has a narrower indoor unit than the average air conditioner (69 cm vs 80.5 cm).
    What it is: Indoor unit width is the horizontal side-to-side dimension of the wall-mounted unit.
    When it matters: A narrower indoor unit fits more easily on limited wall sections and between furniture or openings.

    Importance: MEDIUM

    Good value: Up to 80 cm

    KESSER Split 12000 BTU has a narrower indoor unit than the average air conditioner (69 cm vs 80.5 cm).69 cm vs 80.5 cm
  • 4 cm lower indoor unit
    KESSER Split 12000 BTU has a lower indoor-unit height than the average air conditioner (25 cm vs 29 cm).
    What it is: Indoor unit height is the vertical dimension of the wall-mounted indoor unit.
    When it matters: A shorter indoor unit needs less vertical wall space and fits above doors or windows more easily.

    Importance: MEDIUM

    Good value: Up to 30 cm

    KESSER Split 12000 BTU has a lower indoor-unit height than the average air conditioner (25 cm vs 29 cm).25 cm vs 29 cm
  • 1 more fan speeds
    KESSER Split 12000 BTU provides more fan speed options than the average air conditioner (4 vs 3).
    What it is: The number of selectable fan speeds determines how finely airflow and noise can be adjusted.
    When it matters: More speed settings make it easier to balance cooling intensity, sound, and comfort.

    Importance: MEDIUM

    Good value: At least 3 speeds

    KESSER Split 12000 BTU provides more fan speed options than the average air conditioner (4 vs 3).4 vs 3
  • 0.5 cm shallower indoor unit
    KESSER Split 12000 BTU has a shallower indoor unit than the average air conditioner (20 cm vs 20.5 cm).
    What it is: Indoor unit depth is the front-to-back distance of the wall-mounted unit.
    When it matters: A shallower indoor unit protrudes less into the room and looks less bulky on the wall.

    Importance: MEDIUM

    Good value: Up to 22 cm

    KESSER Split 12000 BTU has a shallower indoor unit than the average air conditioner (20 cm vs 20.5 cm).20 cm vs 20.5 cm
  • 3.1% better value for money
    KESSER Split 12000 BTU offers better value for money than the average air conditioner (7.26 vs 7.036).
    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.
    KESSER Split 12000 BTU offers better value for money than the average air conditioner (7.26 vs 7.036).7.26 vs 7.04
  • 0.6 points higher seasonal heating efficiency
    KESSER Split 12000 BTU achieves a higher seasonal heating efficiency (SCOP) than the average air conditioner (4.6 vs 4).
  • 6 dB lower indoor sound power
    KESSER Split 12000 BTU operates with a quieter indoor unit than the average air conditioner (50 dB vs 56 dB).
  • 12 dB lower outdoor sound power
    KESSER Split 12000 BTU operates with a quieter outdoor unit than the average air conditioner (50 dB vs 62 dB).
  • 1 more fan speeds
    KESSER Split 12000 BTU provides more fan speed options than the average air conditioner (4 vs 3).
  • 11.5 cm narrower indoor unit
    KESSER Split 12000 BTU has a narrower indoor unit than the average air conditioner (69 cm vs 80.5 cm).
  • 4 cm lower indoor unit
    KESSER Split 12000 BTU has a lower indoor-unit height than the average air conditioner (25 cm vs 29 cm).
  • 0.5 cm shallower indoor unit
    KESSER Split 12000 BTU has a shallower indoor unit than the average air conditioner (20 cm vs 20.5 cm).

Total
Overall
Performance
Features
Design
  • 0.2 points lower seasonal cooling efficiency
    KESSER Split 12000 BTU has a lower seasonal cooling efficiency (SEER) than the average air conditioner (6.1 vs 6.3).
  • 10 m² smaller room coverage
    KESSER Split 12000 BTU covers a smaller room area than the average air conditioner (25 m² vs 35 m²).
  • 45 m³/h lower indoor-unit airflow
    KESSER Split 12000 BTU delivers a lower indoor airflow rate than the average air conditioner (550 m³/h vs 595 m³/h).
  • 0.1 kW lower cooling capacity
    KESSER Split 12000 BTU delivers a lower cooling capacity than the average air conditioner (3.4 kW vs 3.5 kW).
  • Does not support automatic self-cleaning
    KESSER Split 12000 BTU does not support automatic self-cleaning, while the average air conditioner supports automatic self-cleaning.
  • Does not support voice control
    KESSER Split 12000 BTU does not support voice control, while the average air conditioner supports voice control.
  • Does not support an anti-mould function
    KESSER Split 12000 BTU does not support an anti-mould function, while the average air conditioner supports an anti-mould function.
  • Does not support automatic self-cleaning
    KESSER Split 12000 BTU does not support automatic self-cleaning, while the average air conditioner supports automatic self-cleaning.
    What it is: Indicates whether the air conditioner can run an automatic internal cleaning or drying cycle.
    When it matters: When you want easier maintenance and less residual moisture or dirt inside the heat exchanger.

    Importance: MEDIUM

    Good value: yes

    KESSER Split 12000 BTU does not support automatic self-cleaning, while the average air conditioner supports automatic self-cleaning.
  • 0.2 points lower seasonal cooling efficiency
    KESSER Split 12000 BTU has a lower seasonal cooling efficiency (SEER) than the average air conditioner (6.1 vs 6.3).
    What it is: SEER expresses the air conditioner’s average cooling efficiency over a typical season.
    When it matters: A higher SEER generally means less electricity is needed to deliver the same seasonal cooling.

    Importance: HIGH

    Good value: At least 6.1

    KESSER Split 12000 BTU has a lower seasonal cooling efficiency (SEER) than the average air conditioner (6.1 vs 6.3).6.1 vs 6.3
  • Does not support voice control
    KESSER Split 12000 BTU does not support voice control, while the average air conditioner supports voice control.
    What it is: Indicates whether the air conditioner can be operated through supported voice assistants.
    When it matters: When hands-free temperature changes and smart-home voice routines are useful.

    Importance: LOW

    Good value: yes

    KESSER Split 12000 BTU does not support voice control, while the average air conditioner supports voice control.
  • Does not support an anti-mould function
    KESSER Split 12000 BTU does not support an anti-mould function, while the average air conditioner supports an anti-mould function.
    What it is: Indicates whether the air conditioner has an anti-mould function that helps keep internal components dry.
    When it matters: When you want to reduce moisture buildup, stale odors, and mould growth inside the unit.

    Importance: LOW

    Good value: yes

    KESSER Split 12000 BTU does not support an anti-mould function, while the average air conditioner supports an anti-mould function.
  • 10 m² smaller room coverage
    KESSER Split 12000 BTU covers a smaller room area than the average air conditioner (25 m² vs 35 m²).
    What it is: Maximum recommended room area is the largest floor area the manufacturer recommends for effective operation.
    When it matters: It helps match the system to the intended room size and avoid choosing an undersized unit.

    Importance: LOW

    Good value: At least 35 m²

    KESSER Split 12000 BTU covers a smaller room area than the average air conditioner (25 m² vs 35 m²).25 m² vs 35 m²
  • 45 m³/h lower indoor-unit airflow
    KESSER Split 12000 BTU delivers a lower indoor airflow rate than the average air conditioner (550 m³/h vs 595 m³/h).
    What it is: Maximum indoor-unit airflow is the greatest volume of air the indoor unit can circulate in one hour.
    When it matters: Higher airflow can distribute cooled or heated air more quickly, especially in larger rooms.

    Importance: HIGH

    Good value: At least 600 m³/h

    KESSER Split 12000 BTU delivers a lower indoor airflow rate than the average air conditioner (550 m³/h vs 595 m³/h).550 m³/h vs 595 m³/h
  • 0.1 kW lower cooling capacity
    KESSER Split 12000 BTU delivers a lower cooling capacity than the average air conditioner (3.4 kW vs 3.5 kW).
    What it is: Cooling capacity is the rate at which the air conditioner can remove heat from a room, expressed in kilowatts.
    When it matters: Adequate capacity is essential for cooling the intended room size without excessive run time or poor temperature control.

    Importance: HIGH

    Good value: At least 3.5 kW

    KESSER Split 12000 BTU delivers a lower cooling capacity than the average air conditioner (3.4 kW vs 3.5 kW).3.4 kW vs 3.5 kW
Total
Performance
Features

Graphic comparison of KESSER Split 12000 BTU and other products in the Air Conditioners category

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Third-party reviews

What customers like about KESSER Split 12000 BTU?

  • Excellent cooling speed, managing to cool spaces like an 18-square-meter bedroom in about 20 minutes
  • High value for money with great energy efficiency ratings (A++ for cooling and A+ or A++ for heating)
  • Convenient smart control options via Wi-Fi and a smartphone app from anywhere
  • Comprehensive complete kit packaging that includes standard mounting materials and copper pipes
  • Quiet indoor operation, specifically praised when utilizing the dedicated silent sleep mode
  • Versatile year-round performance offering reliable cooling, efficient heating, and integrated dehumidification

What customers dislike about KESSER Split 12000 BTU?

  • Initial installation can be complex for inexperienced users, often making professional setup advisable
  • The outdoor unit operation can be noticeably louder or have slightly jerkier start-and-stop transitions compared to premium brands
  • Potential risk of individual Wi-Fi, Bluetooth, or technical module defects over extended long-term use
  • Conflicting or inconsistent manufacturer specifications regarding the exact energy efficiency (SCOP) values

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