EER2 measures the energy efficiency of an air conditioner or heat pump at an outdoor temperature of 95°F. Higher EER2 ratings indicate better energy savings.

EER2: Energy Efficiency Ratio - What is a Good EER2 Rating for AC?

EER2 (Energy Efficiency Ratio) measures the energy efficiency of an air conditioner or heat pump at an outdoor temperature of 95°F. Introduced as an update to the original EER, EER2 standards took effect on Jan. 1, 2023, ensuring all cooling systems meet this efficiency benchmark.

What is EER2?

EER2 reflects an air conditioner’s efficiency under specific conditions: 95°F outdoor, 80°F indoor, and 50% humidity. Higher EER2 ratings indicate better energy efficiency, which can help reduce utility costs and minimize environmental impact.

What’s a Good EER2 Rating for an Air Conditioner?

Minimum EER2 standards vary by region and system capacity, as set by the Department of Energy. Check with a local HVAC specialist to find the ideal EER2 rating for your location and home requirements.

EER2 vs. SEER2

While both EER2 and SEER2 assess AC efficiency, they do so under different conditions:

• EER2: Measures efficiency at a constant high temperature of 95°F.
• SEER2: Evaluates efficiency over a full cooling season, with temperatures ranging from 65°F to 104°F, offering a seasonal average.

Most product descriptions prioritize SEER2 as it represents efficiency across varying conditions, making it more applicable to most users. However, EER2 is particularly relevant in consistently hot climates, like the Southern U.S.

When Does Understanding EER2 Matter?

For areas with intense heat, like the Southern U.S., EER2 is crucial. High EER2 ratings indicate that an AC unit will maintain efficiency even on hot days. In milder regions, SEER2 ratings are generally more useful, as they capture efficiency over a broader temperature range.

Need Help?

A high EER2 rating can help reduce energy bills and environmental impact. For assistance in choosing an air conditioner with optimal EER2 and SEER2 ratings, consult a qualified HVAC specialist.