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The Seasonal Energy Efficiency Ratio (SEER) is the standard measure of a heat pump or air-conditioning system’s efficiency. Essentially, a system’s SEER rating is its cooling output divided by its electrical input. Thus, the higher the SEER rating is, the more efficient the system will be. Since 2006, the Department of Energy has required all new, residential systems to have a minimum SEER rating of 13, but many older units may have a rating as low as six. When comparing systems, remember that in order to find the difference in operating cost, simply divide the smaller SEER rating by the larger one. For example, a 13-SEER unit costs 76.9% as much to operate as a 10-SEER unit