How is EER calculated?
The EER of an air conditioner is its British thermal units (BTU) rating over its wattage. For example, if a 10,000-BTU air conditioner consumes 1,200 watts, its EER is 8.3 (10,000 BTU/1,200 watts). The higher the EER is, the more efficient the air conditioning unit is. However, normally a higher EER is accompanied by a higher price. Generally, an EER of 10 or above is considered good, and Energy-Star air conditioners have are rated with a 10.7 EER or higher. Portable air conditioners are rated in BTU (British Thermal Units) A BTU is the amount of heat used to raise the temperature of one pound of water to 1 degree Fahrenheit or an easier way to think of it is the measure of the amount of heat an air conditioner can remove from the air over a specific amount of time. Proper matching of BTU to your home is essential, because bigger is not always better. A portable AC without enough cooling capacity will struggle to keep your space cool. To maximize your efficiency you need to decide on a
