SEER2 is an updated version the original SEER energy efficiency rating system for air conditioners and heat pumps. It has raised the external static pressure requirement for testing, which the Department of Energy has determined will more closely resemble real-world conditions. External static pressure is the sum of all the external pressures, both positive and negative, that the blower has to work against—such as air filters, registers, and ductwork friction. 

    This added factor means that the SEER2 rating of an HVAC system will be a little less than the old SEER rating. The mandate for manufacturers to use SEER2 testing goes into effect on January 1, 2023, along with new, higher energy efficiency standards. 

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• What does the “SEER” rating of an air conditioner mean? 

• How can I find out the SEER of my air conditioner? 

• Does an old air conditioner use more electricity as it ages?  

• What is the SEER of my old air conditioner? 

• What is a good SEER rating?

• Is the energy efficiency of the furnace part of the SEER rating of a central air conditioning system?

• What is the difference between the SEER and EER rating of an air conditioner? 

• What is the minimum SEER rating for a new air conditioner?

• Is it cost-effective to replace an older, low-efficiency air conditioner system with a new high-SEER system? 

• What is the minimum SEER that HUD requires for an air conditioner or heat pump for a mobile/manufactured home? 

• Does a condenser (outdoor unit) SEER rating determine the SEER of an air conditioning system? 

• How much will I save on my energy bill if I get a new higher SEER air conditioner?

• How energy efficient are window air conditioners compared to a split system whole-house air conditioner? 

• Why does it say INSTALLATION PROHIBITED IN THE SOUTHWEST on my air conditioner label?