Table of Contents

Selection criteria air conditioners

Methodology presents the most energy efficient room air conditioners of Europe, up to a cooling capacity 12 kW. Topten lists single- and multi-split room air conditioners, mobile split and compact (through-the wall, single- and double-ducted units) room air conditioners.

Technical criteria

Air conditioners on meet different requirements regarding cooling and heating mode:
  • Cooling mode: Energy efficiency ratio (EER) required by class A or higher, depending on the type of airconditioner
  • Heating mode (if present): Coefficient of performance (COP) according to class A requirements
Air conditioner type Cooling mode Heating mode
EER Topten EER class A COP Topten / class A
Compact - through-the-wall > 3.0 > 3.0 > 3.4
Compact - single- and double-duct > 3.0 > 2.6 > 3.0
Mobile split > 3.2 > 3.2 > 3.6
Split < 4kW > 5.0 > 3.2 > 3.6
Split > 4kW > 4.1 > 3.2 > 3.6
Multi-split > 3.5 > 3.2 > 3.6

Relevant values have to be provided by the producers. Producers who are not able to provide these values cannot claim to have their appliances displayed on All declarations can be verified by random measurements. As soon as producers start to declare the values according to the new energy labelling regulation (new declarations will appear in the course of 2012) Topten will publish the new declarations.

Data sources

  • Producers’ declarations
  • National data-bases and Topten-sites

Order of presentation

Products are ranked according to their energy efficiency ratio (EER), at identical EER according to their COP. The order of presentation can be changed by clicking at the tables’ headings.


Air conditioner types
Compact (also: local air coolers, LACs)
Compact air conditioners consist of one single unit. Either they are placed in a window or wall opening. Or the whole unit is placed inside while the air is exchanged through one or two ducts leading through a window or wall opening

Compact: through-the-wall

Compact: single-duct

Compact: double-duct

Mobile split
Mobile split air conditioners have an outdoor unit containing the condenser, while the compressor usually is in the indoor unit. The two units are connected by a pipe containing the refrigerant.
Split and multi-split
Split systems are fixedly installed and consist of at least two units. The outdoor unit contains compressor and condensor. The indoor unit contains the evaporator and can have different shapes and be placed on the ceiling, wall, floor or in a canal.
Multi-split systems combine two or more indoor units with an outdoor unit. The indoor units can be placed in different rooms.

Split: outdoor unit

Split: indoor unit

Brand, Indoor and outdoor unit model, Options
Indicates the brand and the model names of the product. For split systems the indoor and outdoor unit model names are indicated sepately, for compact and mobile split air conditioners the system name is indicated. In the case of a series of similar products the smallest appliance is listed. If similar models are available, it is mentioned under ‚Options’.

Type of air conditioner: split-, multi-split, mobile-spilt or compact air conditioner?
Inverters are capable of functioning at partial load and reach higher degrees of efficiency.

Cooling capacity (W)
Maximum cooling capacity in Watt, according to producers’ declarations.

Heating capacity (W)
If a heating funcition is present: maximum heating capacity in Watt, according to producers’ declarations.

Power input cooling (W)
Average power input of the cooling function in Watt, according to prodcers’ declarations.

Energy efficiency ratio EER
Energy efficiency ratio EER of the cooling function, according to EN 14511: Air conditioners, liquid chilling packages and heat pumps with electrically driven compressors for space heating and cooling, under conditions T1 ‚moderate’. The higher its EER, the more efficient a product.

Coefficient of performance COP
Coefficient of performance COP of the heating function (if present), according to EN 14511, under conditions conditions T1 ‚moderate’ + 7C. The higher its COP, the more efficient a product.

Efficiency class

Energy efficiency class according to European Commission, Energy Labelling of Domestic Appliances: Commission Directive 2002/31/EC of 22 March 2002 with regard to energy labelling of household air conditioners. There are different classification schemes for split appliances and compact, single- and double-duct appliances. As a consequence, single- and double-duct compact air conditioners of class A in fact are of similar efficiency as class D split air conditioners.
For products including a heating function the efficiency classes for both cooling and heating function are indicated.

Electricity consumption cooling /heating in kWh/year

Annual electricity consumption for cooling and heating, respectively, in kWh/year. Assumed are 350 hours of cooling and 1400 hours of heating at full load.

Electricity costs cooling /heating
Electricity costs in EUR in 10 years – the product’s typical life time. Basis for the calculation of the electricity costs ist he electricity consumption as defined above and an electricity tariff of 0.15 €/kWh.

Size of the outdoor and the indoor unit: Height x Width x Depth (HxWxD) in mm.

Available in countries
This item displays the availability of models in European countries as far as known - according to producers’ declarations and national Topten sites. The country codes are according to ISO.



Standards and Labels
  • European Commission, Energy Labelling of Domestic Appliances: Commission Directive 2002/31/EC of 22 March 2002 with regard to energy labelling of household air-conditioners (old energy label - valid until the end of 2012).
  • Commission Regulation No 626/2011 on the energy labelling of air conditioners: new energy label, compulsory from 1. January 2013. 2012 is the transition period when both labels can be used.
  • Commission Regulation No 206/2012 on ecodesign requirements for air conditioners and comfort fans. Applies from 1. January 2013.
  • The measurement standard EN 14511 for air conditioners has been revised in 2011 and amended with EN 14825/2012 to include measurement at part load conditions and calculation of seasonal performance by the European Committee for standardisation CEN


05/2012 Nipkow / Berger-Wey / Michel