Daikin

Seasonal Energy Efficiency Ratings

Nominal versus seasonal efficiency

Until 2013, the air conditioning industry used a ‘nominal’ ratio for cooling (EER) and heating (COP) but this resulted in a significant gap between predicted performance and what is actually achieved.

Nominal efficiency gives an indication of how efficient an air conditioner is when operating at full load in nominal conditions (not often achieved).

To rectify this, 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).

Seasonal energy efficiency ratio

The new seasonal energy efficiency ratio (SEER) takes into account a number of factors, which together provide a much more realistic view of energy efficiency in real life conditions, including:

  • Energy performance in different climate zones
  • Efficiency at partial load capacity as well as full load
  • Energy consumption in auxiliary and stand by modes 
  • Different load requirements through the seasons