Apart from suitable functions for users, air conditioners need to be energy saving for long term usage.

Therefore, it is important to check EER (Energy Efficiency Ratio) in Mark 5 label on each air conditioner to

evaluate energy efficiency performance, according to Ministry of Energy standards.

In addition to EER value, it is also important to check SEER (Seasonal Energy Efficiency Ratio) which calculate energy

efficiency performance based on seasonal variation to better reflect real-life situation.  The higher SEER,

the more energy saving that air conditioner can perform.