The Seasonal Efficiency Energy Ratio (SEER) is a measurement unit used to assess the energy efficiency of air conditioners. The higher the SEER, the more efficient is the appliance. The number is obtained by dividing the cooling output (in Btus) by the total electrical energy input (in watt-hours) during a typical cooling season.
Efficiency is usually measured simply by percent. It is a ratio of the output to the input of a given system, which have the same units. Because it is a ratio, those units cancel out. For example, if you input 100 joules of energy in the form of coal into a combustion chamber, and it produces 33 joules of electricity, the combustion chamber has a 33% efficiency.
Eff. = out/in
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