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[Solved] Selecting 3-4kW Portable Air Conditioner for 25m2 Room with NW & NE Windows - Q40HD Climalock

qscgu 6720 18
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How should I choose a portable air conditioner for a 25 m² room, and is the Eberg Qubo Q40HD with Climalock a good option?

For a 25 m² room, the thread’s advice is that a normal portable AC is a poor choice; if a split is impossible, a window unit or a portable-split type like FrostAir is preferred, and one reply says a 2.5 kW inverter split would already be enough while 4 kW is excessive [#17205917][#17205949][#17208389] If you still choose the Eberg Qubo Q40HD, its main advantage is that it can stand outside and be connected from the cooling side, which makes it much quieter indoors; one user reported about 36 minutes to bring a room from nearly 28°C to 22°C with the unit outside [#17215507] The same user said that when the unit was inside, it took about 50 minutes to reach 22°C, and the noise on LOW was like a normal room fan while the compressor sounded roughly like a refrigerator [#17215507] The supplied Climalock window cover was described as basically useless because it was neither tight nor convenient [#17215507] A key drawback is that temperature control does not work when the unit is outside, so the suggested workaround was a simple window plug/opening for the hose plus an external socket thermostat that can restart the unit automatically [#17215507]
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  • #1 17199067
    qscgu
    Level 34  
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    Hello

    He is getting ready to buy an air conditioner for a 25m2 room as in the topic. Unfortunately, the split is out of the question. The budget is around PLN 2,000.

    According to various calculators, I need an air conditioner with a capacity of 3-4kW:
    2 windows facing north-west (1 small, 1 medium)
    2 windows on the north-east side (1 small, 1 medium-sized) + balcony door
    Computer in the room + 1 person

    I was thinking about something like this:
    https://wentylacja24.pl/klimatyzacja/klimatyzatory-przenosne/qubo/q40hd-climalock

    According to the manufacturer, this air conditioner can stand outside, which in my case is possible thanks to the balcony.
    Additionally, this will mean reduced noise and allegedly increased efficiency.

    Maybe there is something better at a similar price?
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  • #2 17199133
    jaszczur1111
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    I wonder what the air supply of 6-8m means according to this advertisement? If you install it outside and seal this pipe with air supply, it's ok. This is an important feature that distinguishes the device from others. However, I strongly do not recommend inserting and letting the hot air pipe outside.
  • #3 17200035
    qscgu
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    jaszczur1111 wrote:
    I wonder what the air supply of 6-8m means according to this advertisement?

    Unfortunately, I have no idea.

    One more thing puzzles me. Would I have to somehow protect it from the weather? Some makeshift "shack" so that it does not rain on him?

    Theoretically, I could put it on the windowsill, but it still won't protect it completely from the weather.
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  • #4 17200446
    rafbid
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    qscgu wrote:
    One more thing puzzles me. Would I have to somehow protect it from the weather? Some makeshift "shack" so that it does not rain on him?
    "The device is adapted to work in difficult conditions due to the increased degree of protection IPX2". So protection against water dripping from different directions at an angle of up to 15 degrees.
    jaszczur1111 wrote:
    I wonder what the air supply of 6-8m means according to this advertisement?
    This could be the distance from which to feel the wind.
  • #5 17201769
    jaszczur1111
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    jaszczur1111 wrote:
    I wonder what the air supply of 6-8m means according to this advertisement?
    This could be the distance from which to feel the wind. [/ Quote]

    Ahhahahaha, of course I also figured it out too, but it's total nonsense. One will feel nothing, the other will say a draft. It still occurred to me that at the distance given when the "blown" person is located, they will feel comfortable. Only that all this is not authoritative.

    Despite the resistance to external factors, I would give a roof, and one from the sun.
  • #6 17205917
    Jan_Werbinski
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    qscgu wrote:
    Hello

    He is getting ready to buy an air conditioner for a 25m2 room as in the topic. Unfortunately, the split is out of the question. The budget is around PLN 2,000.

    If the split is gone, you are screwed.
    For this area, the smallest split with a cooling capacity of 2.5 kW is enough, and it will still be several times too large.
    Portable is a mess. He blows hot air, and new hot air goes through windows and leaks.

    If not split, it's a window air conditioner.
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  • #7 17205939
    qscgu
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    Jan_Werbinski wrote:
    Portable is a mess. He blows hot air, and new hot air goes through windows and leaks.

    That is why I was interested in this model from the link, because in my case it will blow cold air and it will stand outside.

    If this curtain from the set is not tight enough, I will make my own construction.

    As for power, I do not want to argue, but my friend has 4kW splits in a room similar to mine.
    My computer is not a laptop and generates not a small amount of heat, in addition, the arrangement of windows facing the sun does its job.
  • #8 17205949
    Jan_Werbinski
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    4kW x24h = 96kWh. Cosmic amounts of energy for a room of 25m2.
    Oversizing does not make sense because it generates costs and forces you to work on / off. Unless you want to have a sauna there all the time and quickly cool the air for a while? Then it oversizes. There will be no comfort, because the walls, furniture, etc. will radiate heat, and on the other hand, cold air will blow. It's a nightmare for me.
    Having a small inverter split, you set it for long-term continuous operation or even a dozen or so hours a day and you have even, cool temperature throughout the room, comfort and low bills.

    99% of people in the air conditioning industry are dilettante. They offer air conditioners according to the conversion factor 100-150W / m2. They lack the knowledge and intelligence to draw conclusions.
  • #9 17206894
    qscgu
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    Jan_Werbinski wrote:
    Oversizing does not make sense because it generates costs and forces you to work on / off.

    But this is normal, I have yet to come across an air conditioner that runs non-stop. It's not about having a continuous airflow, but a relatively constant temperature in the room. And it would even be great if you didn't feel the airflow at all (but it's not possible). I think we have a different feeling of comfort.

    I already have Saune. The temperature in the room is on average 5-7 degrees higher than outside. I would forget to add that not only is there a computer, but there is also a chimney next to the room. Even in summer, that wall is warm because the water is warm with CO.

    Anyway, electricity bills should probably depend not on the power of the air conditioner but its efficiency, but maybe I don't know something.

    As I said, split is out of the question, so the only thing that makes sense for me is a portable one that I will put outside.
  • #10 17207434
    rafbid
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    qscgu wrote:
    there is a chimney next to the room. Even in summer, that wall is warm because the water is warm with CO
    In summer you don't use CO rather than DHW? Either the hot water consumption is very high or someone does not know how to smoke in the stove.
  • #11 17207657
    Jan_Werbinski
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    qscgu wrote:
    Jan_Werbinski wrote:
    Oversizing does not make sense because it generates costs and forces you to work on / off.

    But this is normal, I have yet to come across an air conditioner that runs non-stop.

    Mine went non-stop. Virtually all winter.
    Are you aware that our country is dominated by the technological and intellectual Middle Ages? People prefer to heat expensive with coal or gas instead of cheap heat pumps in the form of air conditioners.

    Added after 1 [minutes]:

    qscgu wrote:

    I already have Saune. The temperature in the room is on average 5-7 degrees higher than outside. I would forget to add that not only is there a computer, but there is also a chimney next to the room. Even in summer, that wall is warm because the water is warm with CO.

    Do you heat in the summer CO to have hot water? SUMMER in WHAT? :D
    For what? Do you like expensive and keep it hot? Why don't you use a thermal bath for a few hundred zlotys?

    Do what you want. You can read and think or do what others don't think.
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  • #12 17208025
    qscgu
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    This is not my home, folks :D
    Therefore, it does not decide what, who, where, what. And that's why I want a portable air conditioner because I can't drill anything.

    Yes, DHW, but the stove is the same, the chimney is the same. It's just that the circulation to the radiators is closed.
  • #13 17208294
    Jan_Werbinski
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    Do you heat the entire central heating boiler, pipes, water, chimney, room - several dozen kg of steel or cast iron, hundreds of kilograms of chimney and walls, and several dozen liters of water to use 20 liters for a shower?
    Then you want to cool these walls with an air conditioner?
    Then you will light the boiler again?
    Don't you think something is wrong here?
  • #14 17208341
    qscgu
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    Jan_Werbinski wrote:
    Don't you think something is wrong here?

    Don't you think I have nothing to say about it?

    If this were my home and my business, it would be completely different.
    For now, he wants to somehow survive the summer without sitting in a sauna.
  • #15 17208389
    Jan_Werbinski
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    Buy a portable split, e.g. FrostAir.
    If not, I recommend drinking a lot of water, a fan, opening windows at night, closing for the day, shading from the sun.
  • #16 17215507
    qscgu
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    I finally bought an Eberg Qubo Q40HD

    I am already after a little test and overall very satisfied.

    1. The first test was yesterday, it was around 20-22 degrees outside. My room is 27.5 degrees. The air conditioner was in the room.
    a) After about 50 minutes, the air conditioner dropped the temperature to 22 degrees (as much as I had set) - Fan to LOW
    b) When the fan is set to LOW, its volume is comparable to that of a normal room fan
    c) When the compressor starts, the volume already resembles a room fan at full speed.

    2. The second test took place today, this time the air conditioner was standing outside. Temp. outside ~ 24 degrees, in the room almost 28 degrees.
    a) this time it took him about 36 minutes to bring the temperature down to 22 degrees.
    b) was almost inaudible even on HIGH fan setting. There was a hum but more comparable to a refrigerator than a fan
    c) Even after the compressor was turned on, the volume was fine (it's easy to sleep)

    These are, of course, my subjective feelings.

    Now the general disadvantages of the device:
    1. The remote control is inconvenient to use, while sitting in a chair, you need to put your hand up and aim at the air conditioner. The IR receiver is on the top panel, so there is not too much angle. Not a very thoughtful solution.
    2. The "Climalock" window cover is basically money down the drain. It's neither tight nor comfortable, nor is it good for anything at all.
    3. Temperature control simply will not work if the air conditioner is placed outside. This is its biggest drawback.
    3. The heat dissipation hose could be better fitted to these plastic parts.

    Advantages:
    1. Portable.
    2. It is enough for my needs, it easily broke 5-6 degrees in several dozen minutes.
    3. It can stand outside. This is its amazing advantage, you can attach the hose from the walking side in literally 2 seconds.


    At least 2 disadvantages can be eliminated relatively cheaply:
    1. Instead of buying Climalock, it is enough to insert some "plug" into the window with a hole for the pipe, you can also make a hole in the window if you have such an opportunity.

    2. Temperature regulation can be done with a socket thermostat. On Allegro you can find those for about PLN 100 that work for both heaters and coolers. For example, a model PRT1 . I checked, when you disconnect it from the power supply and turn it on again, it remembers the settings and automatically starts.

    Final assessment 4.4
    - a small minus for the remote control
    - a small minus for matching the hose
    - a big minus for the fact that you can not regulate the temperature in any way when the air conditioner is outside.
    +++ a giant plus for the fact that the air conditioner can be placed outside (the pipe can be connected from the cooling side)

    It would be enough if the remote control was not on IRDA but some radio / RF anything and it could be controlled from behind the wall. The problem of the lack of a "thermostat" would not be that big.

    PS. I am not an air conditioning specialist, so all this is my subjective feeling. I am also not able to say whether 36/50 minutes at 5-6 degrees is a good result or not.
    PS2. Room cool down times may not be relevant. For example, a lot depends on what I am currently doing on the computer. Do I have the curtains open, from the time of day etc.
  • #17 17223426
    Chris_W
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    Jan_Werbinski wrote:

    99% of people in the air conditioning industry are dilettante.

    Jan_Werbinski wrote:

    Are you aware that our country is dominated by the technological and intellectual Middle Ages?

    What does it take to be such an enlightened Renaissance man? :D
    Do you know why the Middle Ages are considered ignorant? This is propaganda of people from the next epochs (e.g. Renaissance people, enlightened people) - the facts are that this is no dark ages, and the Renaissance was a time of high scientific arrogance and idolatry in everything - no wonder that their greatest achievement was propaganda about themselves - there are historians who consider the revival a spoiled medieval and I agree with them.
    There is no medieval age in our country, there is an exaggerated unbridled renaissance, everyone knows everything, no modesty ;)

    Quote:

    People prefer to heat expensive with coal or gas instead of cheap heat pumps in the form of air conditioners.

    People are smarter than other people think - maybe that's why?
    I noticed that you were really delighted with the air conditioners - you probably have one recently for use - people in this dark garden have been working with air conditioners for years, and somehow they are not delighted with them ;)
  • #18 17224697
    Jan_Werbinski
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    Chris_W wrote:

    Do you know why the Middle Ages are considered ignorant? It is propaganda of people from the next epochs (e.g. Renaissance people, enlightened people)

    Poles are dark-garden not over time, but now. This is revealed by the BBVA general knowledge test.
    http://www.racjonalista.pl/forum.php/s.515177
    http://kopalniawiedzy.pl/kultura-naukowa-wiedza-nauka-Polacy-Amerykieta-Europa-BBVA,16459,1

    Added after 1 [minutes]:

    Chris_W wrote:

    I noticed that you were really delighted with the air conditioners - you probably have one recently for use - people in this dark garden have been working with air conditioners for years, and somehow they are not delighted with them ;)

    I have had air conditioners for over a dozen years. I have been using the current one for nine years.
    The funny thing is that even people in the refrigeration industry do not believe that they can be the main source of heat in winter.
    If it isn't darkness, what is it?
  • #19 18007882
    qscgu
    Level 34  
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    Eberg Qubo is purchased

Topic summary

✨ The discussion revolves around selecting a portable air conditioner for a 25m² room with specific window orientations (NW and NE) and a budget of PLN 2,000. The user is considering the Eberg Qubo Q40HD model, which can be placed outside to reduce noise and improve efficiency. Concerns are raised about the air conditioner's ability to function effectively in this setup, particularly regarding the hot air exhaust and weather protection. Some participants suggest that portable units may not be as effective as split systems, emphasizing the importance of proper sizing to avoid high energy costs and discomfort. The user reports positive initial tests with the Q40HD, noting its cooling performance and low noise levels.
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FAQ

TL;DR: In a 25 m2 room, a 3–4 kW Eberg Qubo dropped 5–6°C in 36–50 minutes; "It can stand outside." Seal the window and use a plug-in thermostat when the unit is outdoors for real temperature control. [Elektroda, qscgu, post #17215507]

Why it matters: Renters with balconies can cool faster and sleep quieter without drilling or permanent installation.

Quick Facts

What size portable AC works for a 25 m2 room with NE/NW windows?

Thread experience supports 3–4 kW. The Eberg Qubo cooled a 27–28°C room to 22°C in 36–50 minutes. That matched added heat from sunlight and a desktop PC. Set fan to Low indoors for comfort, or place the unit outside. [Elektroda, qscgu, post #17215507]

Will putting the Eberg Qubo outside reduce noise and improve cooling?

Yes. When placed outdoors, noise dropped to an almost refrigerator-like hum, even on High. Cooling time improved to about 36 minutes for 28°C→22°C. Indoors, expect room-fan levels, louder when the compressor starts. Use a well-sealed window panel. [Elektroda, qscgu, post #17215507]

What does Qubo’s IPX2 rating actually protect against outdoors?

IPX2 protects against dripping water falling at up to a 15° tilt from vertical. It does not protect against jets or wind-driven rain. Plan placement so water cannot run into vents. Keep electronics away from standing water. [Elektroda, rafbid, post #17200446]

Should I add a weather hood or sunshade over an outdoor portable AC?

Yes. A simple roof helps shield from sun and oblique rainfall. One poster advised adding a cover even with IPX2. Shade reduces heat soak and helps performance. Ensure exhaust and intakes remain unobstructed for airflow. [Elektroda, jaszczur1111, post #17201769]

Do I need a window kit, and is Climalock any good?

Seal the opening well. The bundled Climalock cover was described as leaky and inconvenient. A rigid window plug or a dedicated circular hole sealed better and improved results. Proper sealing reduces hot air infiltration and noise paths. [Elektroda, qscgu, post #17215507]

How can I control temperature when the AC sits outside and its sensor is outdoors?

The onboard thermostat will misread and fail to control room temperature when the unit sits outside. Use a plug-in socket thermostat in cooling mode to cycle power at your setpoint. Example: PRT1 kept settings after power loss.
  1. Place the unit outside and connect the cold-air hose into the room.
  2. Seal the window opening with a rigid plug or panel.
  3. Plug the AC into a socket thermostat, set Cooling mode and your target temperature. [Elektroda, qscgu, post #17215507]

What does “air supply 6–8 m” mean in the ad?

A poster interpreted it as the distance you can feel the airflow from the outlet. This is marketing language, not a standard metric. Treat it as approximate reach, not guaranteed cooling at that distance. “This could be the distance from which to feel the wind.” [Elektroda, rafbid, post #17200446]

Are single-hose portable ACs inefficient indoors due to negative pressure?

Yes, exhausting indoor air outdoors pulls hot air in through leaks. “Portable is a mess. He blows hot air, and new hot air goes through windows and leaks.” Consider a window air conditioner if a split is impossible. [Elektroda, Jan_Werbinski, post #17205917]

Is a 4 kW unit overkill for a 25 m2 room?

Oversizing hurts comfort and efficiency. One poster noted 4 kW running 24 hours equals 96 kWh. “Oversizing does not make sense because it forces on/off.” Choose smaller inverter splits when allowed; otherwise match loads carefully. [Elektroda, Jan_Werbinski, post #17205949]

How noisy is the Eberg Qubo indoors versus outdoors?

Indoors on Low, noise matched a room fan. With the compressor on, it sounded like a fan at full speed. Outdoors, noise dropped to a gentle hum, likened to a refrigerator, even on High. Sleep was easy. [Elektroda, qscgu, post #17215507]

Is the Climalock window kit worth buying?

Not here. The included Climalock was “neither tight nor comfortable… good for nothing.” A rigid panel or a proper circular cutout sealed better and improved performance. Budget for custom sealing materials. [Elektroda, qscgu, post #17215507]

Is a portable split like FrostAir a better choice when drilling is banned?

A poster recommended a portable split (e.g., FrostAir) when a traditional split is impossible. Compare models and confirm your building rules. It can be a practical compromise for renters. [Elektroda, Jan_Werbinski, post #17208389]

Does heating domestic hot water with a boiler near the room increase cooling load?

Yes. Heating the boiler, pipes, and chimney warms adjacent walls. That heat then radiates into the room you want to cool. Remove that source or expect longer run times and higher bills. [Elektroda, Jan_Werbinski, post #17208294]

What’s the real verdict on Eberg Qubo Q40HD from this thread?

The buyer rated it 4.4/5. Pros: portable, strong cooling, and outdoor placement. Cons: IR-only remote angle, poor hose fit, leaky Climalock, and no usable thermostat when outside. Workarounds included a rigid window plug and a socket thermostat. [Elektroda, qscgu, post #17215507]

How can renters maximize performance without drilling?

Use a balcony-friendly portable unit and place it outdoors. Seal the window opening with a rigid plug instead of fabric covers. Add a socket thermostat to control indoor temperature. This approach delivered faster cooling and lower noise here. [Elektroda, qscgu, post #17215507]
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