Probably one of the most confusing things about buying a new air conditioning system is understanding the S.E.E.R. of the equipment your buying and what S.E.E.R. is best for you. Below are two charts from a few well known equipment manufacturers. "S.E.E.R. is like the gas mileage of a car."
  The savings that you get from higher S.E.E.R. equipment only applies to the air conditioning portion of your electrical bill.

What Do All Those Heat Pump And Air Conditioning Ratings Mean?

Will My New Furnace Work Differently Than My Old One?

What Is Indoor Air Quality?