SEER stands for Seasonal Energy Efficiency Ratio, the standard rating used to measure the cooling efficiency of air conditioners and heat pumps in the United States. SEER is calculated by dividing the total cooling output (in BTUs) during a typical cooling season by the total electrical energy input (in watt-hours) during the same period. A higher SEER number means greater efficiency and lower electricity costs per unit of cooling. As of January 2023, the U.S. Department of Energy requires a minimum SEER2 rating (the updated testing standard) for all new residential AC equipment. The old SEER metric is still widely referenced and understood by homeowners and contractors alike.
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SEER stands for Seasonal Energy Efficiency Ratio, the standard rating used to measure the cooling efficiency of air conditioners and heat pumps in the United States. SEER is calculated by dividing the total cooling output (in BTUs) during a typical cooling season by the total electrical energy input (in watt-hours) during the same period. A higher SEER number means greater efficiency and lower electricity costs per unit of cooling. As of January 2023, the U.S. Department of Energy requires a minimum SEER2 rating (the updated testing standard) for all new residential AC equipment. The old SEER metric is still widely referenced and understood by homeowners and contractors alike.
What does SEER mean for air conditioners?
SEER is the Seasonal Energy Efficiency Ratio. It measures how efficiently an AC uses electricity to cool your home over an entire season. Higher SEER numbers mean lower energy bills.
Source: The Cooling Company
Higher SEER ratings deliver more cooling per dollar of electricity.
In Las Vegas, where AC systems run six or more months per year, the difference between a 14 SEER and 20 SEER system can save hundreds of dollars annually on electricity. Because cooling accounts for the largest portion of Las Vegas energy bills, choosing a higher SEER unit has a faster payback period here than in milder climates.
When comparing AC units, calculate the actual annual energy cost difference between SEER ratings for your usage. In a hot climate like Las Vegas, upgrading from 14 SEER to 18 SEER can save $300 to $500 or more per year in electricity.
“When comparing AC units, calculate the actual annual energy cost difference between SEER ratings for your usage. In a hot climate like Las Vegas, upgrading from 14 SEER to 18 SEER can save $300 to $500 or more per year in electricity.”
Upgrading from a 10 SEER system (common in units from the 1990s) to a modern 18 SEER unit reduces cooling energy consumption by approximately 44%, potentially saving Las Vegas homeowners over $600 per year.
What SEER rating should I choose?
In Las Vegas, 16 SEER or higher is recommended for the best balance of upfront cost and energy savings. Homes with high usage benefit most from 18-20+ SEER systems.
Is a higher SEER always worth the cost?
It depends on your climate and usage. In Las Vegas, where AC runs heavily, the energy savings from a higher SEER unit pay back the premium faster than in cooler climates.
What is the difference between SEER and SEER2?
SEER2 uses updated testing conditions that more closely reflect real-world installation with proper static pressure. SEER2 numbers are slightly lower than SEER for the same equipment.
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