Last updated: August 9, 2021

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Air conditioners provide a pleasantly cool indoor climate on blazing hot summer days. Depending on the type, these units can also function as air purifiers or heaters in winter. The Italian manufacturer De'Longhi has been the market leader in mobile air conditioners for over 30 years.

Our large De'Longhi air conditioner test 2021 will help you choose the best unit for you. We have compared the different types with each other and compiled an overview of the advantages and disadvantages, efficiency and power consumption so that the decision is as easy as possible for you.


  • De'Longhi is a leading manufacturer of high-quality mobile air conditioners. The brand is characterised by sophisticated technologies, maximum performance and energy efficiency.
  • Depending on the need, different types of air conditioners pay off. In the case of mobile air conditioners, we distinguish between units with and without an exhaust air hose.
  • De'Longhi air conditioners are available in different models. To make the right choice, you need to consider various factors such as performance, energy efficiency and volume.

The Best Delonghi Air Conditioner: Our Choices

Guide: Questions you should ask yourself before buying a De'Longhi air conditioner

What are the advantages and disadvantages of De'Longhi air conditioners?

The Italian manufacturer De'Longhi has specialised in mobile air conditioners. With these monobloc air conditioners, all components are housed in one casing - the unit is therefore very compact and you can set it up in different rooms as required. Compared to permanently installed split air conditioners, these units are also inexpensive and easy to maintain.

Most De'Longhi models also work according to the so-called air-air principle. These models use the refrigerant R 290 - a natural gas that contains no toxins or harmful substances compared to other refrigerants. The disadvantage of mobile air conditioners is that they are usually louder than split air conditioners because of the built-in compressor, and they are also not as energy-efficient because the heat cannot be dissipated as effectively.

Nevertheless, De'Longhi units are among the test winners of mobile air conditioners and consistently receive good ratings.

What does a De'Longhi air conditioner cost?

The cost of a De'Longhi air conditioner varies between 150 and 900 €. The difference lies particularly in the type of unit and the energy efficiency - units with an exhaust air hose are more cost-intensive, but also much more energy-efficient, which saves electricity costs in the long run.

The performance and any additional functions such as heating or dehumidification are also decisive for the price. The following table compares the purchase costs of De'Longhi mobile air conditioners with and without an exhaust air hose, energy efficiency classes and savings in electricity costs (compared to reference class B).

Type Acquisition cost Energy efficiency class Savings
Air conditioner with exhaust air hose approx. 400 - 900 € A - A++ up to 50 %
Air conditioner without exhaust hose approx. 100 - 200 € A 10 %

What service does De'Longhi offer?

You can contact the De'Longhi customer service directly via the contact form on the website. Alternatively, you can send an e-mail to [email protected] or call the hotline at 06102 5790888. In the event of a defective or faulty appliance, the staff will be able to tell you where the nearest local customer service centre is.

The warranty period of a De'Longhi air conditioner is usually two years. Optionally, you can extend this for selected units for an additional charge. In the event of a warranty claim, the manufacturer will pay for the repair or replacement of the unit as well as packaging and shipping costs.

What alternatives are there to De'Longhi air conditioners?

De'Longhi is one of the leading manufacturers of mobile air conditioners. Qualitatively comparable brands are Trotec, Pro Breeze, Suntec, Comfee or Klarstein. As an alternative to mobile air conditioners, it is of course worth considering the option of a more energy-efficient split system.

The purchase costs are somewhat higher, but in the long run and especially for several rooms, the investment is worthwhile. However, you can also contribute to a fresh, cool indoor climate with simple steps. Keep the windows closed on hot days and also close existing blinds and shutters to keep the house cool.

Take advantage of the fresh evening air and ventilate well at night. Even if you use an air conditioner, you should take these measures - you will save a lot of electricity.

Delonghi Klimagerät-1

Close the blinds and shutters on hot summer days and ventilate well in the morning and evening to keep the house cool.
(Image source: / calmiel)

Decision: What types of De'Longhi air conditioners are there and which is the right one for you?

In the case of mobile air conditioners, we distinguish between models with and without an exhaust air hose. The difference is fundamental:

Type Advantages Disadvantages
Air conditioners with exhaust air hose Efficient, effective cooling of the air, low electricity costs Exhaust air hose and fixed installation, cost-intensive purchase
Air conditioners without exhaust air hose Inexpensive, very flexible in use, no fixed installation Energy inefficient, high electricity costs, no real cooling of the air

Air conditioner with exhaust air hose

Air conditioners with an exhaust air hose direct the warm exhaust air generated by operation directly outside. This is done via a hose that is either permanently installed or leads outside through a window opening.

Air conditioners with an exhaust air hose work much more efficiently than those without a hose.

These units work much more efficiently than those without an exhaust hose, as the heat generated in the latter cannot be removed anywhere and is therefore released back into the room. With single-hose units, it is important to ensure that no hot air can flow in from outside. Special seals and adapters for windows and doors are available for this purpose. Alternatively, you can also convert any single-hose unit into a two-hose unit - more on this in the trivia.

  • Energy efficient
  • Real cooling of the room air
  • Dehumidification function
  • More cost-intensive
  • Units relatively heavy
  • Higher noise level
  • Exhaust air hose and fixed installation

Air conditioner without exhaust air hose (air cooler)

Mobile air conditioners without an exhaust hose are the most flexible - you only need a power socket to operate them. They work according to a very simple principle: Fans inside the unit draw in the room air. This is cooled to the desired temperature by a coolant and then released back into the room.

Air coolers are, so to speak, just better fans.

However, we cannot speak of real cooling here, because the heat energy extracted from the air has to be released somewhere. Since there is no hose for removal, this air remains in the room and drives the unit to even more power.

Air coolers are just better fans, so to speak. Air conditioners without an exhaust hose are suitable if you are interested in a cheap and short-term solution for a few hot days.

  • Very flexible
  • No fixed installation
  • Inexpensive
  • Lightweight units
  • No exhaust hose
  • Quiet
  • No real cooling
  • Energy inefficient
  • Add more humidity to the air - you sweat even more!

Buying criteria: You can compare and evaluate De'Longhi air conditioners based on these factors

With or without an exhaust hose, cheap or expensive and of high quality? Our buying guide will help you find the best mobile air conditioner for your needs. The following factors are decisive in the selection process:

Energy efficiency

The energy efficiency class of the device provides information about how high the operating costs will be. The more efficiently your appliance works, the less energy is wasted unnecessarily.

In Germany, the energy efficiency of household appliances is indicated by the EU energy label for electrical appliances. The scale ranges from A (best class, lowest demand) to G (worst class). Through technical progress, more and more appliances received a good label, so that the classes A+, A++ and A+++ were additionally introduced.

Cheap mobile air conditioners already require such high energy costs with class B or C that the low purchase price does not pay off at all. Units with an exhaust hose perform much better here, as the warm exhaust air can be efficiently discharged outside.

De'Longhi air conditioners all have an energy class of A to A++. Even this small difference is significant: with class A+ units you save up to 30% more energy than with class A units.

Delonghi Klimagerät-2

The EU energy label for electrical appliances provides information about the energy efficiency of household appliances. A is the best class, G the worst.
(Image source: / OpenClipart-Vectors)


Air conditioners are usually available in different power ratings. How much power your unit needs depends on how large the room to be cooled is or how much heat energy needs to be transported out of it (the so-called cooling load).

The larger the room, the more power the air conditioner must have. This power is indicated by the so-called BTU value ("British Thermal Unit"). 1000 BTU/h correspond to 293.71 watts.

A rule of thumb for calculating the cooling load is: room area in square metres times 60 (good insulation, little sun) to 100 (little insulation, a lot of sun). For a well-insulated room of approx. 25 square metres, this results in a required output of approx. 2000 watts or 6800 BTU/h.


Mobile air conditioners in particular can be very loud when running - up to 65dB is not uncommon. This volume can be compared to the operation of a running sewing machine. A constantly high noise level can lead to physical and psychological stress.

However, most De'Longhi air conditioners operate very quietly due to sophisticated cooling systems. Those of the Silent series, for example, are only 49 - 53dB, around 20% below the maximum permitted noise level.

Especially for use in the bedroom, make sure that your unit offers a sleep function or that you can adjust the operation in stages.

Delonghi Klimagerät-3

Especially if you want to use your air conditioner at night and in the bedroom, the volume of the unit is an important aspect.
(Image source: / sferrario1968)

Additional functions (heating, air purification, etc.)

Another criterion is any additional functions. If you want to clean, humidify or dehumidify the air in addition to cooling it, or even use your unit as a heater in winter, it makes sense to invest in a multifunctional air conditioner. All functions are then integrated into one unit and do not take up any additional space. In addition, you will save a lot of electricity costs if you invest in a high-quality, multifunctional air conditioner right from the start.

Facts worth knowing about the De'Longhi air conditioner

How do I install my De'Longhi air conditioner?

Mobile air conditioners are very flexible. Compared to permanently installed split air conditioners, they can be used in any room. For air conditioners without an exhaust hose, you need nothing but a power socket. For those with a hose, proximity to a window or door is important so that the hot air can be transported out through the hose.

With a window seal, you can prevent warm air from flowing back into the room through an open window. Alternatively, you can convert your air conditioner to a two-hose system, which compensates for negative pressure in the room with the second hose: It does not make sense to extend the exhaust hose, because the larger the surface area of the hose, the more heat it gives off into the room. In addition, there is a risk that condensation in the air can no longer be properly removed.

How do I maintain my De'Longhi air conditioner?

Regular maintenance of your De'Longhi air conditioner is mandatory - especially at the end of the season you should give it another comprehensive cleaning. The following work is required:

  • Clean the filter: To keep your unit in good working order, you should clean the filter once a week. Remove dust deposits with a hoover. If the filter is very dirty, soak it in lukewarm water and rinse it several times. Allow the washed filter to dry sufficiently.
  • Disinfect: An air conditioner that has not been disinfected can become a breeding ground for bacteria, germs and mould. De'Longhi offers suitable disinfectant sprays made of foam, with which you should treat your appliance about every few months, but at least once per season.
  • Drain water: De'Longhi appliances reuse condensation water, but some of it may collect in the drip tray. Empty it regularly.
  • Descale: Your air conditioner needs water to function, which causes calcium to accumulate over time. There are certain descaling solutions for descaling; fill these into the water tank according to the instructions and let your unit run until the solution is completely used up.

What problems can occur with a De'Longhi air conditioner?

De'Longhi air conditioners are among the best on the market - nevertheless, defects and error messages can occur from time to time. In the following you will find common problems and tips on what to do in this case.

  • Air conditioner does not cool: Does your air conditioner show an error message? Check if the unit temperature is lower than the room temperature. Furthermore, the fan should generate air from the back of your unit and the compressor should start running after switching on. A clean filter is also important.
  • Air conditioner leaks water: The condensation water from the unit must be drained off somewhere. De'Longhi air conditioners usually reuse this water for additional cooling of the condenser, but the container must still be emptied regularly for this purpose.
  • Air conditioner shows error message: The error "Ft, HL" means that your air conditioner is full of water and it needs to be drained. The exhaust hose is located at the back of your unit. To do this, pull out the plug and let the water drain out of your system.
  • Air conditioner makes noise: Certain noises are normal for its operation: a humming or grinding noise can come from the compressor, a squeaking noise can come from the plastic housing contracting, and the condensate pump makes a noise that sounds like a splash.

Image source: dmitrimaruta/

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