EER): The ratio of cooling capacity of an air conditioning unit in British thermal units per hour to the total electrical input in watts under specified test conditions.

An efficiency rating system for air conditioning units that corresponds to the number of BTU's output per watt of electricity used.

A ratio calculated by dividing the cooling capacity in BTU's per hour (BTUH) by the power input in watts at any given set of rating conditions, expressed in BTUH per watt (BTUh/watt). EER & SEER can not be compared equally. Air source equipment is rated by SEER and geothermal equipment is rated by EER. EER changes with the inside and outside conditions, falling as the temperature difference between inside and outside gets larger.

Instantaneous efficiency of air conditioners measured at standard test conditions. The amount of cooling provided per unit of electricity purchased. The higher the EER, the more efficient the air conditioner.

Standard air-conditioning performance rating, defined by the U.S.D.O.E. Air-Conditioning Test Procedure, equal to the ratio of cooling capacity in BTUs to the power input in watts at ARI rating conditions.

(EER) - The ratio of cooling capacity of an air conditioning unit in Btus per hour to the total electrical input in watts under specified test conditions. [See California Code of Regulations, Title 20, Section 1602(c)(6)

Means the ratio of the cooling capacity of the air conditioner in British Thermal Units per hour, to the total electrical input in watts under ARI-specified test conditions.

Cooling capacity in BTU/hr divided by electrical energy consumed in watts.

A measure of the energy efficiency of room air conditioners based on the U.S. Department of Energy guidelines.

An equipment efficiency rating that is determined by dividing the output in Btuh by the input in watts. This does not take into account the startup and shutdown for each cycle.

The measure of the instantaneous energy efficiency of room air conditioners; the cooling capacity in Btu/hr divided by the watts of power consumed at a specific outdoor temperature (usually 95 degrees Fahrenheit).

(EER) - The ratio of the cooling capacity of the air conditioner, in Btu per hour, to the total electrical input in watts under test conditions specified by the Air-Conditioning and Refrigeration Institute.

a measure of the cooling or air-conditioning efficiency of an appliance, calculated by dividing the cooling output in Btu/h by the energy input in watts.

An air conditioning efficiency rating system which indicates the number of BTU's delivered per watt of power consumed.

The ratio of the rated cooling capacity in BTUs per hour divided by the amount of electrical power used in watts at any given set of conditions.

Energy Efficiency Ratio; is figured by dividing BTU hours by watts.