While the hot, humid summers of Ohio call for air conditioning, understanding the best unit to meet the needs of any home proves to be a foreign language to many. Lets clear the air with a few facts and figures to get you in-the-know when purchasing an air conditioner. The Seasonal Energy Efficiency Ratio (SEER) produces a rating of sorts for air conditioners. It is figured this way: The amount of cooling a given unit produces (BTU) divided by the amount of electricity (watts) used over a typical cooling season. SEER figures range from 13 to 25. Since the unit is tested on static conditions, the rating represents a units best performance. In brief, this number reflects the maximum rating. For instance, a unit rated at 13 does not perform above but may fall below this figure. Thats helpful. But, what does it mean to you, the consumer? After all, it is just a number on the box. A few answered questions might clear things up even more. What Does the SEER Rating Tell You? Efficiency.