Frequently Asked Questions


What are the benefits of Inverter technology?

The air conditioning units with integrated Inverter technology  compressor, compared with conventional ON-OFF air conditioners (with constant velocity) have:

- Much lower power consumption

- Increased efficiency

- Lower noise level

- Smaller damage incidence

- Increased life time


The largest amount of your initial investment costs related to the purchase of an Inverter air conditioner, amortized over approximately two years, thanks to the about 40% energy saving, compared to a fixed-speed air conditioning unit.


In which criteria do we choose the right air conditioning unit?


Depending on the season, the thermal comfort of the human body is divided into:

- Summer: 25 -28 oC for cooling operation

- Winter: 20 -23 oC for the heating function

If, according to the season, we set the air conditioner at a temperature between the above temperatures, we achieve the optimal thermal comfort while the lowest level of power consumption.

Also it is important that the difference between the external temperature and the inner temperature is maintained between 10-15 ° C.


What are the Energy Class categories?

The European Union has imposed the displaying, in all electrical appliances, of the energy class to which they belong.

With the term "energy class" we mean the indicator of whether this device is energy-intensive or not.


The energy class for the air conditioning units, is defined by SEER factor (for cooling operation) and SCOP factor (for heating operation).

The power consumption is shown in the energy label which accompanies the air conditioners and the lists of products. The categories of Energy classes are shown below:




What is the optimal temperature setting of the air conditioner for economic operation?

Depending on the season, the thermal comfort of the human body is divided into:

- Summer: 25 -28 ° C for cooling operation

- Winter: 20 -23 ° C for the heating operation


Given that the temperature difference of external and internal (conditioned) space should be between 10-15 oC, the most economical operation in combination with the expected thermal comfort, will be achieved when the air conditioner is set in the range of above temperatures.


What characteristics of the conditioned space determine the required power of the air conditioner;

- Orientation of room

- Insulation of residence

- Residence type (apartment, house, etc.)

- Altitude

- Geographical area of ​​residence

Ecological characterization of SENDO units

The SENDO air conditioning units are characterized as environmentally friendly (green) because, they:

- Apply Inverter technology

- Use ecological coolant R410A, which does not burden the ozone layer


- Characterized by low operating noise

- Consume 30% less energy than fixed-speed air conditioners