SEER2 is the updated efficiency testing standard for air conditioners and heat pumps that took effect on January 1, 2023. Mandated by the U.S. Department of Energy, SEER2 uses a revised testing procedure (M1) that adds external static pressure to simulate real-world installation conditions with connected ductwork. Because this added resistance makes the test more realistic but more demanding, SEER2 values are approximately 4.7% lower than the old SEER values for the same equipment. For example, a unit previously rated at 15 SEER would test at roughly 14.3 SEER2. All new residential HVAC equipment manufactured after January 2023 is rated and labeled using SEER2.
/sɪər tuː/
SEER2 is the updated efficiency testing standard for air conditioners and heat pumps that took effect on January 1, 2023. Mandated by the U.S. Department of Energy, SEER2 uses a revised testing procedure (M1) that adds external static pressure to simulate real-world installation conditions with connected ductwork. Because this added resistance makes the test more realistic but more demanding, SEER2 values are approximately 4.7% lower than the old SEER values for the same equipment. For example, a unit previously rated at 15 SEER would test at roughly 14.3 SEER2. All new residential HVAC equipment manufactured after January 2023 is rated and labeled using SEER2.
What is the difference between SEER and SEER2?
SEER2 uses updated testing that simulates real ductwork resistance, producing numbers about 4.7% lower than old SEER. It is more accurate to real-world performance but represents the same equipment efficiency.
Source: The Cooling Company
SEER2 testing adds duct resistance for more realistic efficiency numbers.
When shopping for a new AC in Las Vegas, you will see SEER2 ratings on all current equipment. The numbers look lower than the old SEER you may be used to, but this does not mean the equipment is less efficient — the test is just more rigorous. A 15.2 SEER2 system performs comparably to what was previously labeled 16 SEER.
When comparing a new system's SEER2 rating to your old system's SEER rating, multiply the SEER2 number by 1.047 to get the approximate old SEER equivalent. This helps you accurately compare efficiency improvements.
“When comparing a new system's SEER2 rating to your old system's SEER rating, multiply the SEER2 number by 1.047 to get the approximate old SEER equivalent. This helps you accurately compare efficiency improvements.”
The switch to SEER2 was driven by research showing that the original SEER test (with zero external static pressure) overstated real-world efficiency by not accounting for the resistance of actual ductwork installations.
Is SEER2 better than SEER?
SEER2 is not better or worse — it is a more accurate testing method. The equipment is the same; the test now reflects real-world conditions with ductwork resistance.
Do I need to replace my old SEER-rated system?
No. SEER2 applies only to new equipment. Your existing system continues operating exactly as it always has.
How do I convert SEER to SEER2?
Divide the old SEER number by 1.047 to get the approximate SEER2 equivalent. For example, 16 SEER is approximately 15.3 SEER2.
Need help with seer2? Our licensed technicians in Las Vegas are ready to assist.
Fill out the form below. We typically respond within minutes.
