Just about every type of mechanical system or unit comes with a rating that tells you how much energy the device will use or how the device is expected to perform in terms of fuel usage. For air conditioners, this rating is known as SEER: seasonal energy efficiency ratio. Technically SEER is a rating that describes the ratio of cooling in BTUs to the amount of energy that is consumed; the energy consumed is measured in watt hours. However, you won’t have to worry about being this technical. What you have to know is a) what the scale is and b) what the numbers mean, and the experts at Downtown Air & Heat can help with that.