EER2 stands for the updated Energy Efficiency Ratio, which measures how well a system cools when the outside temperature is at its peak. While SEER2 looks at the whole season, EER2 is specifically focused on the unit's performance during the hottest part of the day. This is a critical number for homeowners in sweltering regions like Texas or Florida, where the AC must work its hardest. You can compare these ratings across our Shop All Ducted and ductless collections to find the most robust performers. High EER2 ratings often correlate with lower demand on the electrical grid and lower peak-hour utility charges. Our Sophia Series units are specifically designed to maintain high efficiency even when the mercury rises. By choosing a system with a strong EER2 score, you ensure that your Wall Mount won't let you down on the hottest days of the year. Always refer to our Technical Data for a full breakdown of these performance metrics.