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Midea MASAG12-21HS1G Review | 46 Data compared

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  • Avg. price in UK: ~£490
  • Avg. price in US: ~$320
  • Cooling capacity: 3.5 kW
  • Seasonal cooling efficiency (SEER): 6.1
  • Maximum indoor-unit sound power level: 54 dB

Midea MASAG12-21HS1G 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.

7.6

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%

7.6

Technical Score

20.0%

?

User score

Very good
7.6

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%

6.1

Performance

40.0%

8.3

Features

20.0%

9.1

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

  • 9.1
    Compactness

    Score components:

    30.0%

    8.5

    Indoor unit width

    30.0%

    9.1

    Indoor unit depth

    20.0%

    9.6

    Indoor unit height

    20.0%

    9.6

    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

  • No image
No image

Best prices in UK

    N/A~ £490

Best rankings

?

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

Verdict

The Midea MASAG12-21HS1G is a 12,000 BTU (1.5 Ton equivalent in regional markets) wall-mounted split system air conditioner designed to efficiently climate-control spaces up to 550 square feet. Running on standard 115-120V power, this AG Series model features dual cooling and heating functionality backed by energy-efficient inverter technology and built-in Wi-Fi connectivity for smart app management. Key advantages include an ultra-quiet sleep mode that drops to low noise levels, rapid temperature adjustment, a compact white chassis, and reliable copper condenser piping that improves corrosion resistance. On the downside, the system requires professional installation to prevent refrigerant leaks, and some users have highlighted inconsistencies with customer support response times when handling warranty claims.

Technical Specifications of air conditioner Midea MASAG12-21HS1G

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

7.6
Midea MASAG12-21HS1G has a technical score of 7.6 points, which is higher than 59% 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
Midea MASAG12-21HS1G 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%

7.6

Overall score

40.0%

6.1

Price

7.1
Midea MASAG12-21HS1G has a quality-to-price ratio of 7.1 points, which is higher than 53.4% 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

3.5 kW
Midea MASAG12-21HS1G delivers a cooling capacity of 3.5 kW, which is higher than that of 45.9% of air conditioners and the same as that of 20% 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
Midea MASAG12-21HS1G 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
Midea MASAG12-21HS1G 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 Midea MASAG12-21HS1G 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 Midea MASAG12-21HS1G 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 Midea MASAG12-21HS1G 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

no
Does Midea MASAG12-21HS1G include dehumidification mode? no. 93.8% of air conditioners do not, while 6.2% do.
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 Midea MASAG12-21HS1G 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
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
Midea MASAG12-21HS1G 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
Midea MASAG12-21HS1G provides remote control physical controls, ahead of 1.1% of air conditioners and equal to 81.5%.
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Midea MASAG12-21HS1G vs the average air conditioner

  • 0.6 points higher seasonal heating efficiency
    Midea MASAG12-21HS1G 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

    Midea MASAG12-21HS1G achieves a higher seasonal heating efficiency (SCOP) than the average air conditioner (4.6 vs 4).4.6 vs 4
  • 12 dB lower outdoor sound power
    Midea MASAG12-21HS1G 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

    Midea MASAG12-21HS1G operates with a quieter outdoor unit than the average air conditioner (50 dB vs 62 dB).50 dB vs 62 dB
  • 2 dB lower indoor sound power
    Midea MASAG12-21HS1G operates with a quieter indoor unit than the average air conditioner (54 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

    Midea MASAG12-21HS1G operates with a quieter indoor unit than the average air conditioner (54 dB vs 56 dB).54 dB vs 56 dB
  • 16 m² larger room coverage
    Midea MASAG12-21HS1G covers a larger room area than the average air conditioner (51 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

    Midea MASAG12-21HS1G covers a larger room area than the average air conditioner (51 m² vs 35 m²).51 m² vs 35 m²
  • 0.5 cm lower indoor unit
    Midea MASAG12-21HS1G 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

    Midea MASAG12-21HS1G has a lower indoor-unit height than the average air conditioner (28.5 cm vs 29 cm).28.5 cm vs 29 cm
  • 5 m³/h higher indoor-unit airflow
    Midea MASAG12-21HS1G delivers a higher indoor airflow rate than the average air conditioner (600 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

    Midea MASAG12-21HS1G delivers a higher indoor airflow rate than the average air conditioner (600 m³/h vs 595 m³/h).600 m³/h vs 595 m³/h
  • 2% cheaper
    Midea MASAG12-21HS1G is cheaper than the average air conditioner (£490 vs £500).
    Midea MASAG12-21HS1G is cheaper than the average air conditioner (£490 vs £500).£490 vs £500
  • 1.6% better value for money
    Midea MASAG12-21HS1G offers better value for money than the average air conditioner (7.15 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.
    Midea MASAG12-21HS1G offers better value for money than the average air conditioner (7.15 vs 7.036).7.15 vs 7.04
  • 0.6 points higher seasonal heating efficiency
    Midea MASAG12-21HS1G achieves a higher seasonal heating efficiency (SCOP) than the average air conditioner (4.6 vs 4).
  • 12 dB lower outdoor sound power
    Midea MASAG12-21HS1G operates with a quieter outdoor unit than the average air conditioner (50 dB vs 62 dB).
  • 2 dB lower indoor sound power
    Midea MASAG12-21HS1G operates with a quieter indoor unit than the average air conditioner (54 dB vs 56 dB).
  • 16 m² larger room coverage
    Midea MASAG12-21HS1G covers a larger room area than the average air conditioner (51 m² vs 35 m²).
  • 5 m³/h higher indoor-unit airflow
    Midea MASAG12-21HS1G delivers a higher indoor airflow rate than the average air conditioner (600 m³/h vs 595 m³/h).
  • 0.5 cm lower indoor unit
    Midea MASAG12-21HS1G has a lower indoor-unit height than the average air conditioner (28.5 cm vs 29 cm).

Total
Overall
Performance
Design
  • 0.2 points lower seasonal cooling efficiency
    Midea MASAG12-21HS1G has a lower seasonal cooling efficiency (SEER) than the average air conditioner (6.1 vs 6.3).
  • Does not support Wi-Fi connectivity
    Midea MASAG12-21HS1G does not support Wi-Fi connectivity, while the average air conditioner supports Wi-Fi connectivity.
  • No dehumidification mode
    Does Midea MASAG12-21HS1G dehumidify independently? no. Does the average air conditioner? yes.
  • Does not support an anti-mould function
    Midea MASAG12-21HS1G does not support an anti-mould function, while the average air conditioner supports an anti-mould function.
  • Does not support Wi-Fi connectivity
    Midea MASAG12-21HS1G does not support Wi-Fi connectivity, while the average air conditioner supports Wi-Fi connectivity.
    What it is: Indicates whether the air conditioner can connect to Wi-Fi for remote or smart control.
    When it matters: When you want to change settings remotely, set schedules, or integrate the unit with a smart home.

    Importance: MEDIUM

    Good value: yes

    Midea MASAG12-21HS1G does not support Wi-Fi connectivity, while the average air conditioner supports Wi-Fi connectivity.
  • No dehumidification mode
    Does Midea MASAG12-21HS1G dehumidify independently? no. Does the average air conditioner? yes.
    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

    Does Midea MASAG12-21HS1G dehumidify independently? no. Does the average air conditioner? yes.
  • 0.2 points lower seasonal cooling efficiency
    Midea MASAG12-21HS1G 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

    Midea MASAG12-21HS1G 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 an anti-mould function
    Midea MASAG12-21HS1G 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

    Midea MASAG12-21HS1G does not support an anti-mould function, while the average air conditioner supports an anti-mould function.
Total
Performance
Features

Graphic comparison of Midea MASAG12-21HS1G and other products in the Air Conditioners category

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Third-party reviews

What customers like about Midea MASAG12-21HS1G?

  • Efficient year-round operation with both powerful cooling and supplemental heating functions
  • Advanced inverter technology that ensures consistent room temperatures while reducing electricity costs
  • High energy efficiency during temperature maintenance
  • Effective at handling multi-season climate needs
  • Generally easy to install and set up compared to non-split alternatives

What customers dislike about Midea MASAG12-21HS1G?

  • Recurring complaints regarding high noise levels or the absence of a dedicated ultra-quiet mode
  • Potential mechanical or reliability concerns, with reports of some units failing to blow cold air over extended periods
  • Noticeable compressor buzz or vibration under high-efficiency load settings

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