What is the Energy Class?

The energy class of an air conditioning unit is the category that has been classified by certified international organizations (from A, which is the best efficiency, to G) and shows how much energy a unit may save in certain circumstances, in order to give us the desirable cooling or heating capacity. For instance, a unit of 9.000Btu/h with A energy class might need power input 820Watt in cooling mode. On the other hand, a B energy class unit of the same cooling capacity might need 1.000Watt. So, we should choose the A class unit with the less power input.