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H.Koenig KOL6812 Review | 44 Data compared

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  • Avg. price in UK: ~£310
  • Avg. price in US: ~$380
  • Cooling capacity: 12,000 BTU/h
  • Maximum room size: 35 m²
  • Maximum noise level: 64 dB
  • Heating function: no
  • Cooling Energy Efficiency Class: A

H.Koenig KOL6812 review. Compare 44 technical specifications and user reviews to see how this product ranks in the Portable Air Conditioners category and whether it is worth buying.

7.3

Overall score

What it is: An overall evaluation of products in the Portable 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 Portable Air Conditioners category.

Score components:

80.0%

7.3

Technical Score

20.0%

?

User score

Very good
7.3

Technical Score

What it is: An assessment of technical performance for products in the Portable Air Conditioners category across these key areas: Performance, Features, Design.

When it matters: When you want to compare products in the Portable Air Conditioners category by technical performance, specifications, and available features.

Score components:

55.0%

7.4

Performance

30.0%

6.8

Features

15.0%

8.2

Design

Very good
?

User score

What it is: A rating that combines user reviews with the total review volume for products in the Portable Air Conditioners category.

When it matters: When you want to know how products in the Portable Air Conditioners category perform in everyday use and how reliable owners find them over time.

Score components:

70.0%

?

User reviews

30.0%

?

Popularity

  • 7.4
    Bedroom use

    Score components:

    35.0%

    2.5

    Maximum noise level

    25.0%

    10

    Night mode

    20.0%

    10

    Timer

    20.0%

    10

    Remote control

  • 8.5
    Large rooms

    Score components:

    40.0%

    10

    Cooling capacity

    30.0%

    6.8

    Maximum room size

    20.0%

    7.4

    Airflow (high speed)

    10.0%

    10

    Airflow direction control

  • 4.3
    Year-round use

    Score components:

    40.0%

    4.0

    Heating function

    30.0%

    2.4

    Dehumidification capacity

    20.0%

    8.0

    Cooling energy efficiency class

    10.0%

    4.0

    Automatic fan speed

  • No image
No image

Best prices in UK

    N/A~ £310

Best rankings

?

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

Verdict

The H.Koenig KOL6812 is a monoblock portable air conditioner featuring a substantial cooling capacity of 3,520 Watts (12,000 BTU) and a maximum airflow rate of 380 m³/h, making it suitable for spaces up to 35 m². This energy class A unit offers four operations—cooling, ventilation (3 speeds), dehumidification, and an automatic-oscillating louve—alongside a 24-hour programmable timer, an LCD display, and an eco-friendly R290 refrigerant. Main pros include its energy efficiency, a dedicated "Silent+" comfort sleep mode for quieter nighttime operation, and a complete installation package containing an LCD remote control, an exhaust hose, and a window kit. However, notable cons are its fairly high maximum sound power level of 64 dB during standard heavy operation and its reliance on being placed strictly on a flat, level surface to minimize vibrating noise.

Technical Specifications of portable air conditioner H.Koenig KOL6812

Technical Score

What it is: An assessment of technical performance for products in the Portable Air Conditioners category across these key areas: Performance, Features, Design.

When it matters: When you want to compare products in the Portable Air Conditioners category by technical performance, specifications, and available features.

Score components:

55.0%

?

Performance

30.0%

?

Features

15.0%

?

Design

7.3
H.Koenig KOL6812 has a technical score of 7.34 points, which is higher than 71.6% 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 Portable Air Conditioners category.

When it matters: When you want to know how products in the Portable 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 Portable Air Conditioners category.
When it matters: When you prefer products in the Portable Air Conditioners category that have been chosen and reviewed by many other buyers.
1.0
H.Koenig KOL6812 has a popularity of 1 points, which is lower than 66.3% of products in this category.
Ratio quality/price

What it is: An indicator that combines the overall score of products in the Portable Air Conditioners category with their prices.

When it matters: When you are comparing products in the Portable Air Conditioners category and want a good balance between quality and price.

Score components:

60.0%

7.3

Overall score

40.0%

7.9

Price

7.5
H.Koenig KOL6812 has a quality-to-price ratio of 7.5 points, which is higher than 82.1% of products in this category.
Cooling capacity
What it is: Cooling capacity is the amount of heat the air conditioner can remove per hour, measured in BTU/h.
When it matters: Higher capacity cools larger or warmer rooms more effectively, provided the unit is sized correctly.

Importance: HIGH

Good value: At least 12,000 BTU/h

12,000 BTU/h
H.Koenig KOL6812 delivers 12000 BTU/h cooling capacity, which is higher than that of 71.3% of portable air conditioners and equal to that of 19.7% of portable air conditioners.
Rated input power
What it is: Rated input power is the electrical power the unit draws at its specified operating point, measured in watts.
When it matters: Lower rated input power reduces electrical demand, though cooling efficiency also depends on delivered capacity.

Importance: HIGH

Good value: Up to 1,200 W

?
Cooling Energy Efficiency Class
What it is: Cooling energy efficiency class summarizes the efficiency of the unit while cooling, from higher to lower letter grades.
When it matters: A higher cooling efficiency class indicates more cooling output for the electricity consumed.

Importance: HIGH

Good value: A or better

A
H.Koenig KOL6812 has cooling energy efficiency class A, which ranks lower than 10.7% of portable air conditioners and equal to 89.4% of portable air conditioners.
Heating energy efficiency class
What it is: Heating energy efficiency class summarizes energy efficiency when the unit operates in heating mode.
When it matters: A higher heating efficiency class matters when the portable air conditioner will also provide regular space heating.

Importance: LOW

Good value: A or better

?
Number of speeds
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

3
H.Koenig KOL6812 offers 3 fan speeds, which is more than 36.8% of portable air conditioners and equal to 61.1% of portable air conditioners.
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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
H.Koenig KOL6812 includes a fan-only mode. 99.5% of portable air conditioners support this mode.
Airflow direction control
What it is: Airflow direction control describes whether outlet air can be aimed automatically, manually, or not at all.
When it matters: Better directional control spreads conditioned air more evenly without repositioning the unit.

Importance: MEDIUM

Good value: automatic

automatic
H.Koenig KOL6812 provides automatic airflow direction control, which ranks higher than 47.3% of portable air conditioners and equal to 52.7% of portable air conditioners.
Night mode
What it is: Night mode adjusts operation for sleeping hours, typically reducing sound, light, or abrupt temperature changes.
When it matters: Night mode is useful when the unit runs in a bedroom or other light- and noise-sensitive space.

Importance: MEDIUM

Good value: yes

yes
H.Koenig KOL6812 includes a dedicated night mode. 74.3% of portable air conditioners offer night mode.
Timer
What it is: A timer lets the unit start, stop, or change operation after a scheduled interval.
When it matters: Timer control helps cool a room before use and avoids running the unit longer than necessary.

Importance: MEDIUM

Good value: yes

yes
H.Koenig KOL6812 includes a built-in timer. 99.5% of portable air conditioners feature a timer.
Maximum timer duration
What it is: Maximum timer duration is the longest interval that can be scheduled before automatic operation changes.
When it matters: A longer timer window offers more flexibility for overnight use and advance scheduling.

Importance: MEDIUM

Good value: At least 24 hours

24 hours
H.Koenig KOL6812 supports a timer of up to 24 hours, which is longer than that of 7.4% of portable air conditioners and equal to that of 92.6% of portable air conditioners.
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Color
What it is: Color describes the main exterior finish of the portable air conditioner.
When it matters: Finish color matters when the unit will remain visible and should suit the room decor.

Importance: LOW

white
Display
What it is: A display shows settings such as target temperature, operating mode, or timer status on the unit.
When it matters: A display makes current settings easier to check without opening an app or using the remote.

Importance: LOW

Good value: yes

yes
H.Koenig KOL6812 includes an integrated display. 99.5% of portable air conditioners feature a display.
Control type
What it is: Control type identifies whether settings are entered through touch controls, physical buttons, or both.
When it matters: The interface style affects tactile feedback, cleaning, accessibility, and ease of use.

Importance: LOW

touch
Remote control
What it is: A remote control operates core functions from across the room without touching the unit.
When it matters: Remote access is convenient when the air conditioner is beside a window, across the room, or used from bed.

Importance: LOW

Good value: yes

yes
H.Koenig KOL6812 comes with a remote control. 99% of portable air conditioners include a remote.
Handles
What it is: Integrated handles provide secure grip points for moving or repositioning the unit.
When it matters: Handles reduce awkward lifting when the air conditioner is moved between rooms or stored.

Importance: LOW

Good value: yes

yes
H.Koenig KOL6812 includes built-in handles for easier carrying. 99.5% of portable air conditioners feature handles.
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H.Koenig KOL6812 vs the average portable air conditioner

  • 3000 BTU/h higher cooling capacity
    H.Koenig KOL6812 delivers higher cooling capacity than the average portable air conditioner (12000 BTU/h vs 9000 BTU/h).
    What it is: Cooling capacity is the amount of heat the air conditioner can remove per hour, measured in BTU/h.
    When it matters: Higher capacity cools larger or warmer rooms more effectively, provided the unit is sized correctly.

    Importance: HIGH

    Good value: At least 12,000 BTU/h

    H.Koenig KOL6812 delivers higher cooling capacity than the average portable air conditioner (12000 BTU/h vs 9000 BTU/h).12000 BTU/h vs 9000 BTU/h
  • 5 m² larger room coverage
    H.Koenig KOL6812 covers a larger room area than the average portable air conditioner (35 m² vs 30 m²).
    Maximum recommended cooling area in m².
    What it is: Maximum room size is the largest floor area the manufacturer recommends the unit should cool.
    When it matters: A larger rated area is important when cooling open-plan spaces or larger rooms.

    Importance: HIGH

    Good value: At least 30 m²

    H.Koenig KOL6812 covers a larger room area than the average portable air conditioner (35 m² vs 30 m²).35 m² vs 30 m²
  • 30 m³/h higher high-speed airflow
    H.Koenig KOL6812 delivers higher high-speed airflow than the average portable air conditioner (380 m³/h vs 350 m³/h).
    What it is: High-speed airflow is the maximum volume of air the fan can move per hour.
    When it matters: Higher maximum airflow circulates cooled air through the room more quickly.

    Importance: HIGH

    Good value: At least 350 m³/h

    H.Koenig KOL6812 delivers higher high-speed airflow than the average portable air conditioner (380 m³/h vs 350 m³/h).380 m³/h vs 350 m³/h
  • 0.1 m longer power cord
    H.Koenig KOL6812 has a longer power cord than the average portable air conditioner (1.9 m vs 1.8 m).
    What it is: Power cord length is the distance the unit can reach from a wall outlet without an extension lead.
    When it matters: A longer cord makes safe placement easier when suitable outlets are limited.

    Importance: LOW

    Good value: At least 1.8 m

    H.Koenig KOL6812 has a longer power cord than the average portable air conditioner (1.9 m vs 1.8 m).1.9 m vs 1.8 m
  • 6.8% better value for money
    H.Koenig KOL6812 offers better value for money than the average portable air conditioner (7.51 vs 7.026).
    What it is: An indicator that combines the overall score of products in the Portable Air Conditioners category with their prices.
    When it matters: When you are comparing products in the Portable Air Conditioners category and want a good balance between quality and price.
    H.Koenig KOL6812 offers better value for money than the average portable air conditioner (7.51 vs 7.026).7.51 vs 7.03
  • 12.9% cheaper
    H.Koenig KOL6812 is cheaper than the average portable air conditioner (£310 vs £350).
    H.Koenig KOL6812 is cheaper than the average portable air conditioner (£310 vs £350).£310 vs £350
  • 3000 BTU/h higher cooling capacity
    H.Koenig KOL6812 delivers higher cooling capacity than the average portable air conditioner (12000 BTU/h vs 9000 BTU/h).
  • 5 m² larger room coverage
    H.Koenig KOL6812 covers a larger room area than the average portable air conditioner (35 m² vs 30 m²).
  • 30 m³/h higher high-speed airflow
    H.Koenig KOL6812 delivers higher high-speed airflow than the average portable air conditioner (380 m³/h vs 350 m³/h).
  • 0.1 m longer power cord
    H.Koenig KOL6812 has a longer power cord than the average portable air conditioner (1.9 m vs 1.8 m).

Total
Overall
Performance
Design
  • No automatic fan-speed control
    H.Koenig KOL6812 does not adjust fan speed automatically, while the average portable air conditioner does.
  • 13 dB louder minimum operation
    H.Koenig KOL6812 is louder at minimum output than the average portable air conditioner (64 dB vs 51 dB).
  • 10.4 l/24 h lower dehumidification capacity
    H.Koenig KOL6812 offers lower moisture removal than the average portable air conditioner (22 l/24 h vs 32.4 l/24 h).
  • 23.5% higher weight
    H.Koenig KOL6812 is heavier than the average portable air conditioner (31.5 kg vs 25.5 kg).
  • 6 cm taller cabinet
    H.Koenig KOL6812 is taller than the average portable air conditioner (77 cm vs 71 cm).
  • 5.5 cm deeper cabinet
    H.Koenig KOL6812 is deeper than the average portable air conditioner (41 cm vs 35.5 cm).
  • 5 cm wider cabinet
    H.Koenig KOL6812 is wider than the average portable air conditioner (43 cm vs 38 cm).
  • 32.3% larger external volume
    H.Koenig KOL6812 has a larger external volume than the average portable air conditioner (135751 cm³ vs 102623.407656 cm³).
  • 10.4 l/24 h lower dehumidification capacity
    H.Koenig KOL6812 offers lower moisture removal than the average portable air conditioner (22 l/24 h vs 32.4 l/24 h).
    What it is: Dehumidification capacity is the maximum volume of moisture the unit can remove from the air in 24 hours.
    When it matters: Higher capacity is more effective in large, persistently humid, or moisture-prone rooms.

    Importance: HIGH

    Good value: At least 24 l/24 h

    H.Koenig KOL6812 offers lower moisture removal than the average portable air conditioner (22 l/24 h vs 32.4 l/24 h).22 l/24 h vs 32.4 l/24 h
  • No automatic fan-speed control
    H.Koenig KOL6812 does not adjust fan speed automatically, while the average portable air conditioner does.
    What it is: Automatic fan speed lets the unit adjust airflow without manual speed changes.
    When it matters: Automatic adjustment improves convenience and can maintain a steadier room temperature.

    Importance: LOW

    Good value: yes

    H.Koenig KOL6812 does not adjust fan speed automatically, while the average portable air conditioner does.
  • 13 dB louder minimum operation
    H.Koenig KOL6812 is louder at minimum output than the average portable air conditioner (64 dB vs 51 dB).
    What it is: Minimum noise level is the quietest stated sound output, normally reached at a reduced fan setting.
    When it matters: Lower minimum noise is valuable in bedrooms, home offices, and other quiet spaces.

    Importance: MEDIUM

    Good value: Up to 50 dB

    H.Koenig KOL6812 is louder at minimum output than the average portable air conditioner (64 dB vs 51 dB).64 dB vs 51 dB
  • 23.5% higher weight
    H.Koenig KOL6812 is heavier than the average portable air conditioner (31.5 kg vs 25.5 kg).
    What it is: Weight is the mass of the portable air conditioner before installation accessories are attached.
    When it matters: A lighter unit is easier to carry, reposition, and move between floors.

    Importance: MEDIUM

    Good value: Up to 25 kg

    H.Koenig KOL6812 is heavier than the average portable air conditioner (31.5 kg vs 25.5 kg).31.5 kg vs 25.5 kg
  • 5.5 cm deeper cabinet
    H.Koenig KOL6812 is deeper than the average portable air conditioner (41 cm vs 35.5 cm).
    What it is: Depth is the front-to-back cabinet dimension of the portable air conditioner.
    When it matters: A shallower unit protrudes less into the room and leaves more usable floor space.

    Importance: LOW

    Good value: Up to 35 cm

    H.Koenig KOL6812 is deeper than the average portable air conditioner (41 cm vs 35.5 cm).41 cm vs 35.5 cm
  • 6 cm taller cabinet
    H.Koenig KOL6812 is taller than the average portable air conditioner (77 cm vs 71 cm).
    What it is: Height is the vertical dimension of the portable air conditioner.
    When it matters: A shorter cabinet fits more easily below windows, shelves, and other height restrictions.

    Importance: LOW

    Good value: Up to 70 cm

    H.Koenig KOL6812 is taller than the average portable air conditioner (77 cm vs 71 cm).77 cm vs 71 cm
  • 5 cm wider cabinet
    H.Koenig KOL6812 is wider than the average portable air conditioner (43 cm vs 38 cm).
    What it is: Width is the side-to-side cabinet dimension of the portable air conditioner.
    When it matters: A narrower unit occupies less wall and floor space beside a window.

    Importance: LOW

    Good value: Up to 35 cm

    H.Koenig KOL6812 is wider than the average portable air conditioner (43 cm vs 38 cm).43 cm vs 38 cm
  • 6.01x less popular
    H.Koenig KOL6812 is less popular than the average portable air conditioner (1 vs 6.005).
    What it is: An indicator based on the number of reviews received by products in the Portable Air Conditioners category.
    When it matters: When you prefer products in the Portable Air Conditioners category that have been chosen and reviewed by many other buyers.
    H.Koenig KOL6812 is less popular than the average portable air conditioner (1 vs 6.005).1 vs 6.01
Total
Overall
Performance
Features
Design

Graphic comparison of H.Koenig KOL6812 and other products in the Portable Air Conditioners category

Attribute category
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Third-party reviews

What customers like about H.Koenig KOL6812?

  • High cooling power with 12,000 BTU / 3520 Watts
  • Quickly lowers the temperature in various rooms
  • Versatile 4-in-1 functionality including cooling, ventilation, dehumidification, and sleep modes
  • Easy to use and program via the built-in LCD screen or the included remote control
  • Energy-efficient and eco-friendly operation with an Energy Class A rating
  • Features a convenient 24-hour programmable timer

What customers dislike about H.Koenig KOL6812?

  • Despite the advertised 'Silent+' feature, the unit runs loud and can disturb light sleepers
  • The included exhaust hose and the power cord are criticized for being significantly too short
  • The physical unit is heavy, making it difficult to move between rooms or different floors
  • Some users reported insufficient cooling performance that struggled to lower the temperature even in medium-sized spaces

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