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What Does "13 SEER" Mean For Me?

family relaxing in comfort with new heat pump technology

What is "13 SEER"?

SEER stands for Seasonal Energy Efficiency Ratio. The seasonal energy efficiency ratio is the amount of cooling that a heat pump (or air conditioner) delivers per watt of electricity used to power the heat pump. In other words, a higher SEER unit uses less electricity.

On January 23, 2006, a new government mandate took effect that raised the minimum efficiency standard for all newly manufactured central air conditioners and heat pumps from 10 SEER to 13 SEER. The regulations require that all products manufactured after that date meet the new standard.

This 30% increase in minimum efficiency could result in energy savings of up to 23% compared to most central air conditioning systems rated at 10 SEER. If your system is more than 10 years old and is rated at only 8 SEER, you can expect to see savings of approximately 55%.

Can I replace only the outdoor unit?

In years past, it was often common for customers to replace just the outdoor section of their air conditioning or heat pump system when a failure occurred. ESA, along with most reputable contractors, will no longer offer this option. Peak efficiency can be achieved only when both the indoor and outdoor sections are properly matched. A new 13 SEER air conditioner used with a 15 year old indoor air handler will operate at only 8 or 9 SEER.

Improperly matched systems are also at risk of premature failure. Because of this risk, many manufacturers void their warranty on a new outdoor unit if it is not properly matched with the indoor unit.


Are there systems with SEERs greater than 13?

Yes, the minimum SEER available today is 13. Systems are available with SEER ratings as high as 19.5. An 18 SEER system will produce energy savings of nearly 40%. For more information see "How to Buy an Energy-Efficient Residential Central Air Conditioner" published by the U.S. Department of Energy.


What is "HSPF"?

HSPF stands for "Heating Seasonal Performance Factor." HSPF is a measure of the efficiency of both the heat pump and the auxiliary electric heating elements combined. The most efficient heat pump systems have HSPF ratings between 7 and 10.




  • Environmental Systems Associates, Inc.
  • 9375-J Gerwig Lane, Columbia MD 21046
  • Lic. HVACR MD 01-2939