Air Conditioners

Home air conditioner: the best deals on Klarstein

As beautiful as the summer is, an air conditioner will provide quick and effective help when the days are extremely hot and the nights aren't much cooler. Even a small air conditioning unit can bring down the temperature in your living room and bedroom, making the purchase of such a device the perfect choice for your office as well.

On Klarstein you can find a variety of air conditioning units - from powerful split air conditioning systems to portable air conditioners which are perfect for use in a caravan, holiday, home or weekend cottage. Whoever wants to cool a room should pay attention to the technology, mechanism and energy consumption features. We present a variety of air conditioning systems for different uses, providing you with essential insights to make the best choice. For additional information, or if you are still in doubt whether an air con unit is the device you should go for, we invite you to check our comprehensive air conditioning buying guide, to find useful comparisons with other cooling devices such as air coolers, stand, tower and ceiling fans.

What aspects to consider before buying your air conditioner

How to find the right air conditioner for your needs? First, rather than a hurried and expensive purchase, consider whether a fan is not a preferable option for the moment, just to get through the most torrid days. Then, early next spring you’ll have enough time to evaluate the purchase of your air conditioner carefully, and will eventually be able to opt for a wall mounted air conditioner or a smaller unit.

If, on the other hand, you have already decided to buy an air conditioner, after considering some aspects and deciding where to install it, it is important to have an overview of the main solutions available, how much you must be ready to spend and how to use it at best. In case you go for split models, find a serious and qualified installer: a bad installation can compromise the performance and in some cases cause serious damage. A mobile air conditioner is cheaper and easier to transport and install, and the following criteria are also important to consider:

  • Aesthetics: a mobile air conditioner is much less attractive than a split air conditioner. However, there has been a substantial improvement in design in recent years

  • Noise level: before buying, we advise you to carefully check the unit's decibel emissions. It would be annoying not to be able to sleep if you keep it on during the night

  • Power: a mobile air conditioner is less powerful than a split air conditioner. Some split units also offer heating functions, which turns them a useful device to quickly warm you rooms in winter

  • Price: this usually depends mainly on the power of the unit. They can be very expensive, especially if you choose one with multiple functionalities

  • Energy consumption: a rating system, from A++ to E, is used to determine which models are the most energy intensive. It's recommended to choose always energy-efficient air conditioning units, ideally in the A or A+ class

  • Size of the room to cool: for a small room a mobile air conditioner may be more suitable. The airflow rate should also be adapted to the volume of the room

Air conditioning system: what's the right size?

The first thing to evaluate is the size of the space you need to refresh because not all appliances are ideal for all areas: depending on the size of the rooms, in fact, it will be possible to choose an air con unit that can effectively lower the temperatures. This assessment is very important not only for the efficiency of the appliance but also to guarantee energy savings.

The measurement unit for the output of an air conditioning system - i.e. the cooling capacity of the air conditioning system itself - are BTU/h or Kw/h. BTU stands for British Thermal Unit and expresses the cooling capacity per hour. As for the kilowatt/hour ratio, do not confuse these kilowatts, which refer to the output power, with the kilowatts expressing the energy consumption of the air conditioning system. For example, an air conditioner delivering 3 Kw/h will not necessarily consume 3 kilowatts per hour. Assessing the power of an air conditioner is essential to make the right choice, because based on the size of the room you will be able to find the most efficient device for your needs. As a rule of thumb, you can refer to the following table:

Room size, in square meters Recommended power, in BTU/h
0 - 10 5000
10 - 15 7000
15 - 25 9000
25 - 40 12000
40 - 50 15000
50 - 60 18000

Different types of air conditioner

There are different types of air conditioners on the market, each one with its pros and cons. Here are the main ones:

    Kraftwerk smart, portable air conditioning unit
  • Portable air conditioning units
    Portable air conditioners, also called monoblock air conditioners, offer maximum flexibility, as they can be easily moved and are not bound by the outdoor unit as in the case of wall-mounted, split air conditioners. Unlike a fixed air conditioner, in a mini air conditioner the drainpipe is not necessarily installed on the wall and can be moved from window to window. Although the performance of portable air conditioners is lower than fixed split and they tend to be noisier, portable monoblock air conditioners are a good solution for home environments and small offices, because they are more versatile. Some small air conditioners perform a dual function, offering cooling and heating.

    The operating principle of a portable air conditioner is quite straightforward: the core of device is the compressor, which cools the refrigerant that is then circulated in a large coil. A fan sucks the hot air from the room and forces it through the cold coil, obtaining a double effect: the air is reintroduced into the cooler room and part of the humidity, which condenses upon contact with the cold metal of the coil, is eliminated. The hot air resulting from compressor operation, together with the humidity accumulated on the coil, is conveyed out of the house through the necessary exhaust pipe.

  • Klarstein Frostik window air conditioner
  • Window air conditioners without external unit
    Air conditioners without an external unit are the ideal solution if you need to air condition your room without affecting the aesthetics of the façade. In particular, it is the priority choice of building technicians to safeguard the aesthetics of historic buildings, but there are few models on the market, costs are not very competitive and performance is lower than split models with two units. The engine will be placed in the room and not outside.



  • Klarstein Windwaker Eco Split air conditioning system
  • Fixed split conditioners
    They consist of an external compressor connected to the internal element fixed to the wall in the room to be cooled. Some models are only used for cooling and others, while others are equipped with a heat pump, which also allow the air to be heated in winter. Heat pump air conditioners perform two functions: cooling the room and heating the air. This means that by installing a heat pump air conditioner, you can ensure the ideal climate management for temperature, humidity, ventilation and air cleanliness with a single product. Heat pump air conditioners make it possible to create extremely flexible systems that are useful in all seasons for managing the climate in your home, office or other premises.

    During the winter, in fact, a heat pump air conditioner can help homes with central heating to heat their flats even at times not agreed at condominium level; in mid-season, the heat pump air conditioner can help in cases of unexpected cold, and, in areas with a mild climate, a heat pump air conditioner can even replace a primary heating system. All of this is without taking into account the pleasure of cool and properly humidified rooms even during the hottest seasons.

  • Multi-split air conditioning units
    In this case the external compressor is connected to two or more internal elements. Installation is more complicated than fixed splits, but the advantage is that different temperatures can be set for the various rooms in the house. On the other hand, of course, power consumption is affected, causing consistently higher electricity bills.
Air conditioner type Pros Cons
Monoblock air conditioning unit

Easy to install

Different options available in terms of performance

It's efficient in controlling the humidity and filtering the air

It makes quite some noise

It requires installation

Air conditioner with inverter

It ensures constant, cool temperatures

It's more energy efficient, with lower consumption

Easy maintenance and durability

No feeling of cold draft

Higher purchase price

It requires installation

Portable air conditioner

Lower purchase cost

Different designs available

Different functions available

It can generate noise

It produces a flow of hot air that has to be conveyed outside through an exhaust pipe;

Higher energy consumption

Where to install the air conditioner and how to use it correctly.

One of the general rules to achieve good air conditioning is certainly not to over-cool the rooms in the summer season. To obtain an optimal level of comfort, it is sufficient to set the temperature 5 to 7 °C lower than the outside temperature. In fact, an excessive temperature difference between the external and the internal environment is a waste of energy and it can be harmful to health. In the same way, it is a good idea to avoid hitting people with flows of air that are too cold, using the special fins that direct the flow of air for this purpose. Also on hot days, in the middle of the day, in order to disperse energy, it is a good idea not only to keep the windows closed but also to ajar the shutters or protect the windows with curtains providing shade.

Here's some additional tips to maximise the performance of your air conditioning unit:

  • Set the exhaust air speed to less than 0.25 m/s

  • Consumption is highest when the appliance is started. Therefore, avoid switching it on repeatedly

  • Clean the filters and replace them according to the instruction manual

  • It is recommended to run the air conditioner in ventilation mode for one hour at the end of the hot season

  • Close the doors and windows when the unit is running

Air conditioner: frequently asked questions

To get the maximum benefit and reduce costs is it better to keep the air conditioner on all the time?

No. Ideally you should turn the air conditioner on only when you are at home and set the desired temperature without exaggerating: a maximum of 6°C less than the outside temperature is enough. Thanks also to the dehumidifying effect, comfort is guaranteed and appreciable in just a few minutes, with a sure saving on your bill.

Portable air conditioning unit or fixed air conditioner: which one to choose?

Portable air conditioners in general are less efficient than wall split air conditioners because they are often a monoblock. In addition to this, it is necessary to leave a gap in the door or window, to place the pipe for the heat to escape from the room, and this compromises the overall air conditioning of the room. Consider that they are often noisier.

What is the appropriate temperature?

The best temperature, also in order not to exceed consumption, is around 25°C, but it is always better not to go below 6-7°C compared to outside because an excessive temperature jump can be dangerous for your health. Moreover, electricity consumption is lower if you use air conditioning at a higher temperature.

Is there a difference between the water of the indoor unit and that of the outdoor unit?

There are no differences. You can reuse condensed water for cleaning, for watering - not always because it is demineralised and therefore poor for plants - or for ironing, but in this case follow the manufacturer's instructions.

Do air conditioning filters remove viruses and bacteria? Are they useful for allergy sufferers? The important thing is to avoid water stagnation where bacteria could proliferate, such as Legionella, but the risk in domestic installations is very low.

Is it better to have a fixed air conditioner or a portable air conditioner?
A portable air conditioning unit may be practical when our use of the home conditioner is limited and discontinuous in time; however, for continuous use, heat pump air conditioners will be the ideal choice. In fact, wall-mounted air conditioning uniots are generally quieter, and much quicker at balancing the humidity rate or temperature of a room, let alone the air-purifying filtering action.

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