SEER and SEER2

Definition:

SEER (Seasonal Energy Efficiency Ratio) measures the cooling efficiency of air conditioners and heat pumps over an entire cooling season. It is calculated by dividing the total cooling output (measured in British Thermal Units, or BTUs) by the total electrical energy input (in watt-hours).

SEER2 is an updated version of this metric, introduced in 2023 to reflect more accurate real-world operating conditions. SEER2 testing incorporates higher external static pressure to better simulate how systems perform in typical installations. (trane.com)

Short Description:

SEER and SEER2 measure the energy efficiency of cooling systems, with SEER2 providing a more realistic evaluation based on updated testing standards.

Why It’s Important:

•Energy Efficiency: Higher SEER and SEER2 ratings mean greater efficiency, lower energy consumption, and reduced cooling costs.

•Regulatory Compliance: As of January 2023, SEER2 has replaced SEER as the standard efficiency metric for new HVAC equipment in the U.S.

•Environmental Impact: More efficient systems reduce electricity demand, which lowers greenhouse gas emissions.

Other Things to Consider:

•Regional Standards: Minimum SEER and SEER2 requirements vary by region due to different climate conditions, so ensure compliance with local efficiency standards.

•System Matching: Properly matched indoor and outdoor equipment is critical. While an outdoor condenser unit might belong to a specific “SEER family,” the system’s final SEER or SEER2 rating depends on how all components work together.

•Lab vs. Real-World Performance: Laboratory testing provides standardized SEER and SEER2 values, but actual efficiency depends on proper installation, regular maintenance, ductwork quality, and home insulation. Even a high-SEER system can underperform if not installed correctly.

By considering these factors, homeowners can make informed decisions when selecting an HVAC system, ensuring efficiency, performance, and compliance with current standards.