Klarstein portable air conditioners: discover all our offers

It's getting warmer and, especially if you live in the city, an air conditioner becomes your faithful ally during the summer months. Unfortunately, traditional wall-mount units are not always the ideal solution: besides requiring a wall installation, they are expensive and inconvenient if you live in a rented house. Plus, they can be pretty noisy. As an alternative, you could consider buying a portable air conditioner.

Have a look at our selection of functional, durable Klarstein standing air conditioners, designed with extreme attention to detail to offer a pleasant look and a massive flow of fresh air, even with their reduced size and price. Continue reading to know more about the features you should pay attention to, and in case you are still wondering whether to look for an aircon portable unit, an air cooler or a fan to face the hot temperatures of the summer, access our AC buying guide where you can find interesting comparisons and information about these devices.

How does a portable air conditioner work?

Klarstein Pure Blizzard portable air conditioner

The cooling system of a portable air conditioner works using a refrigerant gas undergoing changes between gaseous and liquid state, after being compressed inside the air conditioner itself and then expanded in the evaporator. Here, the air cools down until it reaches the desired temperature. At this point, it is conveyed into the room through a ventilation system, while the hot air, which is part of this thermo-dynamic cycle, is expelled outside the room through a special flexible pipe.

The drop in room temperature is achieved mainly by the ratio between the size of the room and the power of the appliance, measured in BTUs (short for British Thermal Units per hour). For adequate cooling in a room with a ceiling of up to 3 metres, you’ll need an output of 340 BTUs per square metre. Therefore, for a 30 square metres room, choose a portable air conditioner capable of developing around 10000 BTUs. Be careful, however: there are additional factors to consider. Very high ceilings, southern exposure of the room, heat-generating appliances, and very high average temperatures in the area add to count, meaning you would need additional BTUs.

Before buying a portable air conditioner: what to look at?

To find the best portable ac unit for your needs, we recommend paying attention to the following aspects:

  • volume of the room to be cooled

  • temperature at which the device works

  • size and weight of the unit, if you plan to move it between different rooms

  • dehumidifying capacity (number of litres in 24 hours)

  • tank volume and the presence of a pipe to convey the hot air outside

  • the possibility of automatically adjusting the temperature and degree of humidity

  • the presence of filters to purify the air

  • easy access to the filter for maintenance

Different kinds of mobile air conditioner

Monoblock mobile air conditioners consist of a single unit and can be found on the market in various models. Once you have established the power you need, you can go for a model with or without a pipe. As for the technologies used to maintain the temperature, you can find inverter models and mobile air conditioners with an on/off mechanism. But let's see in detail all the air conditioners on the market, to help you make the right choice.

Portable air conditioners with external hose

To use this type of air conditioner, you’ll ideally create a hole in the window or wall where the hose outlet can be positioned. Alternatively, you can attach the hose to a half-closed window and place draught excluders or use ad hoc accessories to prevent the muggy air from entering through the opening.

Portable air conditioners without exhaust hose

These devices rely on evaporative cooling technology. They, therefore, have the advantage of not performing a thermal cycle with refrigerant gas. This reduces costs and spares you the compressor noise. Pay attention, however, when the relative humidity is very high, as is often the case in continental summer climates, as their capacity is minimal and the reduction in temperature will be insignificant. Also, consider that the water you put in the internal tank is cooling the hot air, meaning that you will have to load the water frequently depending on its capacity.

Among these models, you will also find "water nebulisers" whose principle is based on the evaporation of water. As they evaporate, the micro-particles absorb the heat contained in the air, giving immediate refreshment.n The same principle is proposed for water fans, and these devices are ideal in open spaces when the heat is oppressive, and you need to cool the air somehow.

Air con portable units with Inverter

Portable air conditioners with inverter motor technology are more expensive butr more energy-efficient. Once the desired temperature has been reached, they continue to operate by reducing the power to a minimum to keep it stable. Acoustic comfort is also better as the compressor runs at a slower speed.

Air conditioners with external unit

Conditioners with an external unit work in the same way as monoblock units. The difference lies precisely in this box which contains the heat-exchanging mechanism and, sometimes, the compressor, leading to a better energy efficiency index than small air conditioning units. Some of these appliances have power ratings that are close to those of fixed split models. Placing the compressor outside will partially resolve the noise problem. On the other hand, their cost is often high, and there are not so many models on the market due to their scarce diffusion.

Essential features to consider when choosing a portable air conditioner

Once you have found the right model for you, what are the most important characteristics for a correct choice? Here is everything you need to assess.
BTUs and power: the drop in ambient temperature and the cooling is achieved by the ratio between the size of the room and the power of the appliance, which is measured in BTUs. The table below shows the power required in Btu according to the square metres of the room you need to air-condition.

Room are (in square meters) BTUs
0 - 10 5000
10 - 15 7000
15 - 25 9000
25 - 40 12000
40 - 50 15000
50 - 60 18000


Mobile air conditioners have their internal compressor to compress the gas and, unfortunately, the noise emitted can be annoying. To give you an idea, here's what to expect from these appliances, which emit well over 60 (dB) in operation.

  • Conversation between 2 people 60 (dB)

  • Noisy office interior 70 (dB) (disturbing)

Winter function

Although visually not differing from other models, heat pump air conditioners can do something very interesting: reverse their operation. Instead of producing only fresh air in the summer, they also warm air on colder days. However, keep in mind that to evacuate the cold air produced, you will also have to use the pipe to the outside.

Consumption and efficiency

Here are some tricks to improve the performance of your portable air conditioner and to increase its efficiency;

  • only use these appliances when the muggy weather is making us lose your tempers

  • try to keep doors and windows closed to limit the volume of air to be treated

  • use external blinds so that the unfavourable contributions of the sun do not counteract the coolness of the air conditioner

  • seal the passage of the hose towards the outside as best as possible: this is a fundamental operation because otherwise, much of the work done by the mobile air conditioner will be nullified by the heat entering the air room.
  • Finally, consider that opening a window or a door for the passage of the pipe, unfortunately, also means more noise coming from outside.

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