Air conditioners are the most efficient way to cool your space. The energy efficiency of air conditioners with the integration of new technologies have reduced energy consumption (eg A +++ air conditioners) and now their use is considered the most correct and "smart" cost / performance solution. Also in the winter months they can be used as a reliable solution for heating your space.

At the same time, portable air conditioners have the advantage of being able to be transported to another room in the house. Portable units consume much less than a central air conditioner. They can be used as a standalone unit or to complete a central air conditioner, to achieve the required temperature.

But what are the main criteria for buying an air conditioner?

In addition to the design, you need to consider the necessary BTUs, the inverter quality, the noise produced by the indoor unit, and the energy class.

The required power of the air conditioner is measured in BTU (British Thermal Unit), and depends on the volume of the room, as well as the insulation, the floor and the orientation of the space, the number of people living in the space, as well as the power of the rest. electrical appliances located in the same space.
To calculate how many BTUs are necessary for cooling and heating your space, click here.
Ideally, the power of your air conditioner will be a little higher than necessary, otherwise the desired temperature will be reached more slowly and the air conditioner will burn more energy.
Based on the desired temperature and space losses, inverter air conditioners have the ability to automatically adjust their power. In this way, they achieve the desired temperature faster, and maintain it throughout their use. Conventional air conditioners, on the other hand, stop working when the desired temperature is reached and turn on again when the temperature exceeds a certain limit, with the result that restarting requires more electricity.
This means that inverter air conditioners are silent, with lower operating costs (up to 50% less power consumption) and less damage. Inverter air conditioners have a higher purchase cost than common air conditioners, but the depreciation is relatively immediate (about 2 years) due to lower consumption and therefore lower electricity bills.
The energy class of the air conditioner

According to a European Union directive, electrical products available for purchase or sale such as air conditioners, white appliances, light bulbs, etc. they must have an energy efficiency label. The energy class of the devices is indicated by characters from A to G, from the most to the least efficient. However, with the effort of continuous improvement of the energy efficiency of the devices, in many cases the grades A +, A ++ and A +++ have been included.
The energy cooling efficiency is described by the EER (energy efficiency ratio) and the energy heating efficiency by the COP (coefficient of performance). The higher the COP and EER, the more energy efficient the air conditioner.

Other functions
Some air conditioning models have features that make them easy to use and improve both their performance and air quality. Some of these functions are fan operation, dehumidification, dust filter, turbo, silent operation, and Sleep mode, auto cleaning, Anticoldair function, and finally the remote control and LCD screen.
Mounting point
Each air conditioner has its own characteristics, however the general principle is that cold air should not fall directly on people.
More specifically, the air conditioner must be installed in places where air can circulate in the room, without being obstructed by furniture, and at the same time be accessible to maintenance technicians. Finally, the outdoor unit should be placed in the shade, as otherwise the air conditioner consumes up to 10% more energy. 

Maintenance tips
There is no need to set the thermostats too low or too high. In winter we do not need to overheat the premises, but it is enough to adjust the temperature to 21 ° C and ventilate regularly. In summer, the ideal temperature is 25 ° C and no systematic use of air conditioning is required.
The temperature difference between indoor and outdoor is good not to exceed 10-12 degrees. Humidity is ideally between 40% and 60%.
In times when the air conditioner is not used, it is advisable to turn on the clock every two months for two months, and the filters to be cleaned both at the beginning of each season and every month during the months of use.