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In the United States, the efficiency of air conditioners is often rated by the seasonal energy efficiency ratio (SEER) which is defined by the Air Conditioning, Heating, and Refrigeration Institute, a trade association, in its 2008 standard AHRI 210/240, Performance Rating of Unitary Air-Conditioning and Air-Source Heat Pump Equipment. [1]
In Europe, the seasonal efficiency of refrigeration equipment, chillers and air conditioners is often rated by the European seasonal energy efficiency ratio (ESEER) which is controlled (among others) by the Eurovent Certification Company. [1] A similar standard in the United States is the integrated energy efficiency ratio (IEER).
For air conditioners, the directive applies only to units under 12 kW. Every label contains the following information: the model, the energy efficiency category from A+++ to G, the annual energy consumption (full load at 500 hours per year) the cooling output at full load in kW
Every air conditioning system when evaluated by the test procedures for SEER and EER will provide some hopefully repeatable number. For that air conditioning system, these two ratings will have some ratio to each other. Accordingly, that ratio is fixed only by the SEER rating and the EER rating and is not affected by where the system is installed.
HSPF is specifically used to measure the efficiency of air source heat pumps. HSPF is defined as the ratio of heat output (measured in BTUs) over the heating season to electricity used (measured in watt-hours). [1] [2] It therefore has units of BTU/watt-hr. The higher the HSPF rating of a unit, the more energy efficient it is.
Clothes washers, dishwashers, refrigerators, freezers, televisions, water heaters, window air conditioners, mini split air conditioners, central air conditioners, furnaces, boilers, heat pumps, and other electronic appliances are all required to have EnergyGuide labels. [1]
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