The Seasonal Energy Efficiency Ratio (SEER) measures the cooling efficiency of air conditioning systems over a typical cooling season. It is calculated by dividing the total cooling output (in British Thermal Units, or BTUs) by the total energy consumed (in watt-hours) during that period. A higher SEER rating indicates a more energy-efficient system, which can lead to lower electricity bills. SEER ratings are important for consumers when selecting air conditioning units or heat pumps. In many regions, systems with a SEER rating of 14 or higher are considered energy-efficient, helping to reduce environmental impact and energy costs.