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Klarstein Iceblock Prosmart 9 Review | 44 Data compared

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  • Avg. price in UK: ~£350
  • Avg. price in US: ~$400
  • Cooling capacity: 9,000 BTU/h
  • Maximum room size: 44 m²
  • Maximum noise level: 65 dB
  • Heating function: no
  • Cooling Energy Efficiency Class: A

Klarstein Iceblock Prosmart 9 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.

6.7

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%

6.6

Technical Score

20.0%

6.7

User score

Good
6.6

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%

5.8

Performance

30.0%

6.9

Features

15.0%

9.2

Design

Good
6.7

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%

7.2

User reviews

30.0%

5.6

Popularity

User score:
United Kingdom
amazon
3.6
(31)

(Reviews last updated: August 2026)

Good
  • 6.9
    Bedroom use

    Score components:

    35.0%

    1.0

    Maximum noise level

    25.0%

    10

    Night mode

    20.0%

    10

    Timer

    20.0%

    10

    Remote control

  • 6.1
    Large rooms

    Score components:

    40.0%

    4.6

    Cooling capacity

    30.0%

    9.4

    Maximum room size

    20.0%

    2.3

    Airflow (high speed)

    10.0%

    10

    Airflow direction control

  • 4.5
    Year-round use

    Score components:

    40.0%

    4.0

    Heating function

    30.0%

    3.0

    Dehumidification capacity

    20.0%

    8.0

    Cooling energy efficiency class

    10.0%

    4.0

    Automatic fan speed

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Best prices in UK

Best rankings

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

Verdict

The Klarstein Iceblock Prosmart 9 is a versatile 3-in-1 portable air conditioner designed for cooling, fan ventilation, and dehumidifying small to medium spaces up to 44 m². This energy-efficient Class A appliance delivers a powerful 9,000 BTU (2.6 kW) cooling capacity with an airflow of up to 330 m³/h, utilizing eco-friendly R290 refrigerant and operating across a temperature range of 16 to 31 °C. Key advantages include its smart Wi-Fi app integration, Amazon Alexa and Google Home compatibility, a 24-hour programmable timer, an included window sealing kit, and a specialized night mode for reduced noise during sleep. However, its primary drawbacks are the inherent bulk and typical operational noise associated with portable single-hose compressor units, alongside the dependency on maintaining proximity to a window for the exhaust pipe.

Technical Specifications of portable air conditioner Klarstein Iceblock Prosmart 9

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%

5.8

Performance

30.0%

6.9

Features

15.0%

9.2

Design

6.6
Klarstein Iceblock Prosmart 9 has a technical score of 6.64 points, which is lower than 51.1% 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%

7.2

User reviews

30.0%

5.6

Popularity

User score:
United Kingdom
amazon
3.6
(31)

(Reviews last updated: August 2026)

6.7
Klarstein Iceblock Prosmart 9 has a user score of 6.71 points, which is lower than 90% of products in this category.
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.
5.6
Klarstein Iceblock Prosmart 9 has a popularity of 5.6 points, which is lower than 53.7% 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%

6.7

Overall score

40.0%

7.5

Price

6.9
Klarstein Iceblock Prosmart 9 has a quality-to-price ratio of 6.9 points, which is lower than 61.1% 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

9,000 BTU/h
Klarstein Iceblock Prosmart 9 delivers 9000 BTU/h cooling capacity, which is higher than that of 26.6% of portable air conditioners and equal to that of 30.3% 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
Klarstein Iceblock Prosmart 9 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
Klarstein Iceblock Prosmart 9 offers 3 fan speeds, which is more than 36.8% of portable air conditioners and equal to 61.1% of portable air conditioners.
Show more
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
Klarstein Iceblock Prosmart 9 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
Klarstein Iceblock Prosmart 9 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
Klarstein Iceblock Prosmart 9 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
Klarstein Iceblock Prosmart 9 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
Klarstein Iceblock Prosmart 9 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
Klarstein Iceblock Prosmart 9 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
Klarstein Iceblock Prosmart 9 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
Klarstein Iceblock Prosmart 9 includes built-in handles for easier carrying. 99.5% of portable air conditioners feature handles.
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Klarstein Iceblock Prosmart 9 vs the average portable air conditioner

  • 14 m² larger room coverage
    Klarstein Iceblock Prosmart 9 covers a larger room area than the average portable air conditioner (44 m² vs 30 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

    Klarstein Iceblock Prosmart 9 covers a larger room area than the average portable air conditioner (44 m² vs 30 m²).44 m² vs 30 m²
  • 2 cm shallower cabinet
    Klarstein Iceblock Prosmart 9 is shallower than the average portable air conditioner (33.5 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

    Klarstein Iceblock Prosmart 9 is shallower than the average portable air conditioner (33.5 cm vs 35.5 cm).33.5 cm vs 35.5 cm
  • 5.9% lower weight
    Klarstein Iceblock Prosmart 9 is lighter than the average portable air conditioner (24 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

    Klarstein Iceblock Prosmart 9 is lighter than the average portable air conditioner (24 kg vs 25.5 kg).24 kg vs 25.5 kg
  • 1 dB quieter minimum operation
    Klarstein Iceblock Prosmart 9 is quieter at minimum output than the average portable air conditioner (50 dB vs 51 dB).
    Lowest stated operating noise.
    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

    Klarstein Iceblock Prosmart 9 is quieter at minimum output than the average portable air conditioner (50 dB vs 51 dB).50 dB vs 51 dB
  • 14 m² larger room coverage
    Klarstein Iceblock Prosmart 9 covers a larger room area than the average portable air conditioner (44 m² vs 30 m²).
  • 1 dB quieter minimum operation
    Klarstein Iceblock Prosmart 9 is quieter at minimum output than the average portable air conditioner (50 dB vs 51 dB).
  • 2 cm shallower cabinet
    Klarstein Iceblock Prosmart 9 is shallower than the average portable air conditioner (33.5 cm vs 35.5 cm).
  • 5.9% lower weight
    Klarstein Iceblock Prosmart 9 is lighter than the average portable air conditioner (24 kg vs 25.5 kg).

Total
Performance
Design
  • No automatic fan-speed control
    Klarstein Iceblock Prosmart 9 does not adjust fan speed automatically, while the average portable air conditioner does.
  • 50 m³/h lower high-speed airflow
    Klarstein Iceblock Prosmart 9 delivers lower high-speed airflow than the average portable air conditioner (300 m³/h vs 350 m³/h).
  • 1 dB louder at maximum output
    Klarstein Iceblock Prosmart 9 is louder at maximum output than the average portable air conditioner (65 dB vs 64 dB).
  • 1 °C lower maximum temperature
    Klarstein Iceblock Prosmart 9 has a lower maximum temperature setting than the average portable air conditioner (31 °C vs 32 °C).
  • 8.4 l/24 h lower dehumidification capacity
    Klarstein Iceblock Prosmart 9 offers lower moisture removal than the average portable air conditioner (24 l/24 h vs 32.4 l/24 h).
  • 6 cm wider cabinet
    Klarstein Iceblock Prosmart 9 is wider than the average portable air conditioner (44 cm vs 38 cm).
  • 2.7% larger external volume
    Klarstein Iceblock Prosmart 9 has a larger external volume than the average portable air conditioner (105391 cm³ vs 102623.407656 cm³).
  • 0.5 cm taller cabinet
    Klarstein Iceblock Prosmart 9 is taller than the average portable air conditioner (71.5 cm vs 71 cm).
  • No automatic fan-speed control
    Klarstein Iceblock Prosmart 9 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

    Klarstein Iceblock Prosmart 9 does not adjust fan speed automatically, while the average portable air conditioner does.
  • 50 m³/h lower high-speed airflow
    Klarstein Iceblock Prosmart 9 delivers lower high-speed airflow than the average portable air conditioner (300 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

    Klarstein Iceblock Prosmart 9 delivers lower high-speed airflow than the average portable air conditioner (300 m³/h vs 350 m³/h).300 m³/h vs 350 m³/h
  • 8.4 l/24 h lower dehumidification capacity
    Klarstein Iceblock Prosmart 9 offers lower moisture removal than the average portable air conditioner (24 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

    Klarstein Iceblock Prosmart 9 offers lower moisture removal than the average portable air conditioner (24 l/24 h vs 32.4 l/24 h).24 l/24 h vs 32.4 l/24 h
  • 1 dB louder at maximum output
    Klarstein Iceblock Prosmart 9 is louder at maximum output than the average portable air conditioner (65 dB vs 64 dB).
    What it is: Maximum noise level is the loudest stated sound output, usually produced at full cooling or fan speed.
    When it matters: Lower maximum noise makes intensive cooling less disruptive during work, conversation, or sleep.

    Importance: MEDIUM

    Good value: Up to 60 dB

    Klarstein Iceblock Prosmart 9 is louder at maximum output than the average portable air conditioner (65 dB vs 64 dB).65 dB vs 64 dB
  • 1 °C lower maximum temperature
    Klarstein Iceblock Prosmart 9 has a lower maximum temperature setting than the average portable air conditioner (31 °C vs 32 °C).
    What it is: Maximum set temperature is the highest thermostat target available in the unit controls.
    When it matters: A higher maximum setting provides a broader adjustment range, especially on models with heating.

    Importance: LOW

    Good value: At least 30 °C

    Klarstein Iceblock Prosmart 9 has a lower maximum temperature setting than the average portable air conditioner (31 °C vs 32 °C).31 °C vs 32 °C
  • 6 cm wider cabinet
    Klarstein Iceblock Prosmart 9 is wider than the average portable air conditioner (44 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

    Klarstein Iceblock Prosmart 9 is wider than the average portable air conditioner (44 cm vs 38 cm).44 cm vs 38 cm
  • 19.3% lower user score
    Klarstein Iceblock Prosmart 9 has a lower user score than the average portable air conditioner (6.71 vs 8).
    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.
    Klarstein Iceblock Prosmart 9 has a lower user score than the average portable air conditioner (6.71 vs 8).6.71 vs 8
  • 1.8% worse value for money
    Klarstein Iceblock Prosmart 9 offers worse value for money than the average portable air conditioner (6.91 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.
    Klarstein Iceblock Prosmart 9 offers worse value for money than the average portable air conditioner (6.91 vs 7.026).6.91 vs 7.03
Total
Overall
Performance
Features
Design

Graphic comparison of Klarstein Iceblock Prosmart 9 and other products in the Portable Air Conditioners category

Attribute category
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Third-party reviews

United Kingdom
amazon
3.6
31 Reviews

(Reviews last updated: August 2026)

What customers like about Klarstein Iceblock Prosmart 9?

  • Efficient 3-in-1 multi-functionality offering cooling, fan, and dehumidification modes.
  • Smart-home integration via the Klarstein app allowing seamless control from anywhere over Wi-Fi.
  • Good cooling performance of 9,000 BTU suitable for medium-sized rooms up to 32 square meters.
  • Eco-friendly operation utilizing a powerful compressor with R290 refrigerant and Class A energy efficiency.
  • Convenient control options including physical buttons, remote control, and voice command compatibility with Alexa or Google Home.
  • Easy mobility provided by smooth, integrated floor castors.

What customers dislike about Klarstein Iceblock Prosmart 9?

  • Relatively high operational noise levels, which can be disruptive during sleep or focused work.
  • Typical portable AC constraints, requiring a large exhaust hose and window sealing kit to deposit hot air outside.
  • The window sealing kit provided can sometimes be finicky or require additional sizing depending on the window type.
  • Significant energy consumption when utilized continuously during long peak summer periods.

Expert reviews

H
homeandsmart.de
19/05/2022
Summary of the review
Portable Klarstein Air Conditioners: Reviews, Models, and Prices
(Translated)Show original

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