Efficiency of air conditioning systems

Seasonal Energy Efficiency Ratio for EPCsAs a result of the ErP directive. Seasonal efficiency is a new and more realistic way of measuring the true energy efficiency of heating and cooling air conditioning products over an entire year. A new rating system has been developed and must be used by all manufacturers. These ratings introduce Seasonal Energy Efficiency Ratio (SEER) value in cooling and Seasonal Coefficient of Performance (SCOP) value in heating. These ratings measure annual energy consumption and efficiency in typical day-to-day

use and they take into account temperature fluctuations and standby periods to give a clear and reliable indication of the typical energy efficiency over an entire heating or cooling season.

Until 2013, the air conditioning industry used a 'nominal' ratio for cooling (EER) and heating (COP). Nominal efficiency gives an indication of how efficient an air conditioner is when operating at full load in nominal conditions (not often achieved). A more accurate method – the 'seasonal efficiency' ratio (SEER) – has been developed, which gives a better measure of the real-life energy efficiency of systems. Seasonal efficiency gives an indication of how efficient an air conditioner is when operating over an entire cooling or heating season (giving a more realistic efficiency measure).

The new energy labelling indicates the energy efficiency of the product from A+++, A++, A+, A, B etc and, unlike the old label, it includes cooling and heating. It also states the sound emissions of the unit. It is not possible to simply compare new and old energy classes (i.e. an old 'A' label' is not equivalent to a new 'A label'). There is no direct relation between SEER and EER. Go here to download the full EU directive.

Note: The Energy efficiency classes table shown is for air conditioners, except double ducts and single ducts from A+++ to D and beyond. The colour scheme is for illustrative purposes only and varies based on the label type.

The old Energy Efficiency Class

Commission Directive 2002/31/EC (in application of Directive 92/75/EEC) with regard to energy labelling of household air conditioners makes it obligatory for all concerned units to have labelling when they are presented for sale in shops or department stores. Although not mandatory it was decided to include labelling in the present Directory of Certified Products which will give much more dissemination to this action.

All air conditioners with a cooling capacity under 12 kW (AC1) are concerned. Directive defines for each type of product the energy class going from A (more efficient) to G (less efficient). 

Energy labelling