SEER vs. SEER2
SEER vs. SEER2
What Are SEER and SEER2?
SEER (Seasonal Energy Efficiency Ratio) measures how efficiently an air conditioner or heat pump cools over an entire season. It’s calculated as the total cooling output (in BTUs) divided by the total electrical energy input (in watt-hours)
SEER2 is the updated version of SEER, introduced as the new U.S. DOE standard starting January 1, 2023. It uses a more rigorous testing procedure that better simulates real-world conditions—such as realistic duct static pressure—to give a more accurate picture of system efficiency/
SEER2
Why SEER2 Matters
Better Efficiency Insight
SEER2 gives a more realistic expectation of how your system will perform—and how much energy you’ll use in real life.
Compliance & Regulations
Since January 2023, all new HVAC units must be rated according to SEER2 standards.
Consumer Benefit
Higher SEER2 units typically offer improved energy savings and comfort due to more consistent performance over time.
SEER vs. SEER2
Key Differences Between SEER and SEER2
Understanding the differences between SEER and SEER2 helps homeowners and businesses make smarter decisions when upgrading or replacing their cooling systems. While both standards measure air conditioner efficiency, SEER2 is designed to provide a more realistic picture of performance under everyday conditions.
- Testing Conditions – SEER uses lab settings, while SEER2 adds real-world airflow resistance and cycling losses.
- Real-World Accuracy – SEER2 reflects everyday usage with part-load efficiency and temperature changes.
- Numerical Impact – SEER2 ratings are typically 4–5% lower than SEER equivalents.
- Practical Example – A 16 SEER unit may now be rated about 15.2 SEER2.
- Better Consumer Insight – SEER2 helps buyers understand true energy use and system efficiency.