EER

EER, or Energy Efficiency Ratio, is a measurement used to show how efficiently an HVAC system, such as an air conditioner or heat pump, operates at a steady state. It is calculated by dividing the system’s cooling output (measured in BTUs) by the energy it consumes (measured in watts) under specific conditions. A higher EER means the system is more energy-efficient. Typically, EER is tested at an outdoor temperature of 95°F, an indoor temperature of 80°F, and a relative humidity of 50%. This measurement is useful for comparing cooling equipment, especially in regions with consistently high temperatures.