Energy Efficiency Ratio (EER) and Energy Star Rating Air Conditioner

A room air conditioner's efficiency is measured by the energy efficiency ratio (EER). The EER is the ratio of the cooling capacity (in British thermal units [Btu] per hour) to the power input (in watts). The higher the EER rating, the more efficient the air conditioner.

To further promote the efficient use of energy in the country, the Minimum Energy Performance Standard (MEPS) has been introduced by the government for efficient electrical equipment and material. To meet the requirements of the MEPS, the performance criteria when tested using the relevant testing standards has to be met. The testing standards and performance criteria have been set for the following equipment.

• Performance Indicator and Testing Standards

• Energy Efficiency Ratio (EER) based on tests done in accordance to MS ISO 5151:2004 (Non-ducted air conditioners and heat pump: performance indicator and testing standard).

• The tests can be either the Balanced Type Calorimeter or Psychometric type.

• The tested capacity value must be at least 90% of that declared by the manufacturer.