Much like automobile manufacturers, today’s air conditioner manufacturers are required by law to evaluate and rate their equipment according to its energy efficiency. This rating is known in the industry as a SEER, or Seasonal Energy Efficiency Rating. The higher the SEER, the more efficient the equipment. Most new homes with central air come equipped with a standard builder’s model. However, when replacement becomes necessary, property owners can upgrade their air conditioning by specifying a more energy-efficient system. The Rheem Prestige Series™ High Efficiency model, for example, has a SEER of 18.00, among the highest available. It’s significantly higher than today’s standard models, many of which carry SEER’s of at least 13. High SEER models are generally more expensive, but can easily make up the difference by reducing your home energy bills over the long run.