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Costway 12000 BTU Split Review | 46 Data compared

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  • Avg. price in UK: ~£600
  • Avg. price in US: ~$560
  • Cooling capacity: 3.4 kW
  • Seasonal cooling efficiency (SEER): ?
  • Maximum indoor-unit sound power level: ?

Costway 12000 BTU Split 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.

8.3

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%

8.3

Technical Score

20.0%

?

User score

Excellent
8.3

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%

6.7

Performance

40.0%

9.1

Features

20.0%

9.7

Design

Excellent
?

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

  • 9.2
    Compactness

    Score components:

    30.0%

    9.2

    Indoor unit width

    30.0%

    9.5

    Indoor unit depth

    20.0%

    9.6

    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~ £600

Best rankings

?

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

Verdict

The COSTWAY Inverter Mini Split Air Conditioner and Heater is a versatile 4-in-1 or 5-in-1 climate control system available in configurations ranging from 9,000 to 24,000 BTUs, featuring a high-efficiency inverter compressor, a 22 SEER2 energy rating, and eco-friendly R32 refrigerant. Main characteristics include multiple operational modes (cool, heat, dry, fan, and sleep), an indoor noise output as low as 19 to 22 dB, Wi-Fi smartphone app connectivity, smart home integration with Alexa, and a 57°C high-temperature self-cleaning system. Key advantages are its rapid 30-second cooling and 60-second heating response, impressive energy efficiency that visibly lowers electricity bills, and uniform 4D auto-swing airflow distribution. However, notable drawbacks include the absolute necessity of a complex, professional installation by a licensed HVAC technician using a vacuum pump, non-standard sizing on some line connections, and the limited availability of long-term replacement control boards compared to premium brands.

Technical Specifications of air conditioner Costway 12000 BTU Split

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

8.3
Costway 12000 BTU Split has a technical score of 8.25 points, which is higher than 89.9% 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
Costway 12000 BTU Split 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%

8.3

Overall score

40.0%

5.0

Price

7.3
Costway 12000 BTU Split has a quality-to-price ratio of 7.3 points, which is higher than 66.3% 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
Costway 12000 BTU Split 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

?
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

5.1
Costway 12000 BTU Split has a SCOP rating of 5.1, which is higher than that of 94.9% of air conditioners and the same as that of 3.8% 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 Costway 12000 BTU Split 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 Costway 12000 BTU Split 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 Costway 12000 BTU Split 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 Costway 12000 BTU Split 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 Costway 12000 BTU Split 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

white
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 and metal
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
Costway 12000 BTU Split 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 center
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 and onboard controls
Costway 12000 BTU Split provides remote control and onboard controls physical controls, ahead of 83.2% of air conditioners and equal to 16.9%.
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Costway 12000 BTU Split vs the average air conditioner

  • 1.1 points higher seasonal heating efficiency
    Costway 12000 BTU Split achieves a higher seasonal heating efficiency (SCOP) than the average air conditioner (5.1 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

    Costway 12000 BTU Split achieves a higher seasonal heating efficiency (SCOP) than the average air conditioner (5.1 vs 4).5.1 vs 4
  • Broader physical control options
    For physical control setup, Costway 12000 BTU Split lists remote control and onboard controls, while the average air conditioner lists remote control.
    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

    For physical control setup, Costway 12000 BTU Split lists remote control and onboard controls, while the average air conditioner lists remote control.remote control and onboard controls vs remote control
  • 5 dB lower outdoor sound power
    Costway 12000 BTU Split operates with a quieter outdoor unit than the average air conditioner (57 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

    Costway 12000 BTU Split operates with a quieter outdoor unit than the average air conditioner (57 dB vs 62 dB).57 dB vs 62 dB
  • 34.68 m² larger room coverage
    Costway 12000 BTU Split covers a larger room area than the average air conditioner (69.7 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

    Costway 12000 BTU Split covers a larger room area than the average air conditioner (69.7 m² vs 35 m²).69.677 m² vs 35 m²
  • 1 more fan speeds
    Costway 12000 BTU Split 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

    Costway 12000 BTU Split provides more fan speed options than the average air conditioner (4 vs 3).4 vs 3
  • 2 cm narrower indoor unit
    Costway 12000 BTU Split has a narrower indoor unit than the average air conditioner (78.5 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

    Costway 12000 BTU Split has a narrower indoor unit than the average air conditioner (78.5 cm vs 80.5 cm).78.5 cm vs 80.5 cm
  • 0.5 cm shallower indoor unit
    Costway 12000 BTU Split 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

    Costway 12000 BTU Split has a shallower indoor unit than the average air conditioner (20 cm vs 20.5 cm).20 cm vs 20.5 cm
  • 0.5 cm lower indoor unit
    Costway 12000 BTU Split has a lower indoor-unit height than the average air conditioner (28.5 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

    Costway 12000 BTU Split has a lower indoor-unit height than the average air conditioner (28.5 cm vs 29 cm).28.5 cm vs 29 cm
  • 1.1 points higher seasonal heating efficiency
    Costway 12000 BTU Split achieves a higher seasonal heating efficiency (SCOP) than the average air conditioner (5.1 vs 4).
  • 5 dB lower outdoor sound power
    Costway 12000 BTU Split operates with a quieter outdoor unit than the average air conditioner (57 dB vs 62 dB).
  • 34.68 m² larger room coverage
    Costway 12000 BTU Split covers a larger room area than the average air conditioner (69.7 m² vs 35 m²).
  • 1 more fan speeds
    Costway 12000 BTU Split provides more fan speed options than the average air conditioner (4 vs 3).
  • Broader physical control options
    For physical control setup, Costway 12000 BTU Split lists remote control and onboard controls, while the average air conditioner lists remote control.
  • 2 cm narrower indoor unit
    Costway 12000 BTU Split has a narrower indoor unit than the average air conditioner (78.5 cm vs 80.5 cm).
  • 0.5 cm shallower indoor unit
    Costway 12000 BTU Split has a shallower indoor unit than the average air conditioner (20 cm vs 20.5 cm).
  • 0.5 cm lower indoor unit
    Costway 12000 BTU Split has a lower indoor-unit height than the average air conditioner (28.5 cm vs 29 cm).

Total
Overall
Performance
Features
Design
  • 183 m³/h lower indoor-unit airflow
    Costway 12000 BTU Split delivers a lower indoor airflow rate than the average air conditioner (412 m³/h vs 595 m³/h).
  • 0.1 kW lower cooling capacity
    Costway 12000 BTU Split delivers a lower cooling capacity than the average air conditioner (3.4 kW vs 3.5 kW).
  • Does not support comfort airflow mode
    Costway 12000 BTU Split does not support comfort airflow mode, while the average air conditioner supports comfort airflow mode.
    Provides an airflow pattern intended to reduce direct drafts.
  • Does not support comfort airflow mode
    Costway 12000 BTU Split does not support comfort airflow mode, while the average air conditioner supports comfort airflow mode.
    Provides an airflow pattern intended to reduce direct drafts.
    What it is: Indicates whether the air conditioner provides a comfort airflow mode that avoids blowing directly on people.
    When it matters: When you want comfortable cooling without a direct draft on people in the room.

    Importance: MEDIUM

    Good value: yes

    Costway 12000 BTU Split does not support comfort airflow mode, while the average air conditioner supports comfort airflow mode.
  • 183 m³/h lower indoor-unit airflow
    Costway 12000 BTU Split delivers a lower indoor airflow rate than the average air conditioner (412 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

    Costway 12000 BTU Split delivers a lower indoor airflow rate than the average air conditioner (412 m³/h vs 595 m³/h).412 m³/h vs 595 m³/h
  • 0.1 kW lower cooling capacity
    Costway 12000 BTU Split 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

    Costway 12000 BTU Split delivers a lower cooling capacity than the average air conditioner (3.4 kW vs 3.5 kW).3.4 kW vs 3.5 kW
  • 20% more expensive
    Costway 12000 BTU Split is more expensive than the average air conditioner (£600 vs £500).
    Costway 12000 BTU Split is more expensive than the average air conditioner (£600 vs £500).£600 vs £500
Total
Overall
Performance
Features

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

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Third-party reviews

What customers like about Costway 12000 BTU Split?

  • Effective and fast cooling for small to medium-sized rooms, bedrooms, and offices
  • Versatile 4-in-1 functionality including cooling, fan, heating, and dehumidifying
  • Portable design with wheels, allowing for easy movement between rooms
  • Simple, intuitive control panel and remote control, with some models offering Wi-Fi and Alexa connectivity
  • Self-evaporating system reduces the need for manual water drainage in some models

What customers dislike about Costway 12000 BTU Split?

  • Noise level can be high, which is typical for portable air conditioners
  • Installation of the window venting kit can be tricky and requires patience
  • The unit is quite heavy, making it difficult to lift or move up stairs
  • Less effective in very large, open, or poorly insulated spaces
  • Window kit may need extra sealing for optimal performance

Video reviews

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