SEER Savings Calculator

The most important technical change in 2023 was the transition from SEER to SEER2. SEER2 is a more accurate measurement that accounts for the higher "external static pressure" found in real-world ductwork. Generally, a SEER2 rating is about 4.5% lower than the old SEER rating for the same piece of equipment (e.g., a 15 SEER unit is roughly equivalent to a 14.3 SEER2 unit). Our calculator handles these conversions to ensure you are making an "apples-to-apples" comparison. When shopping for a new AC, look for units that are Energy Star Cold Climate certified, as these often offer the best balance of efficiency and performance across all temperature ranges.

Beyond the rating itself, Operating Conditions dictate your actual savings. A high-efficiency unit will only reach its rated SEER2 if the ductwork is sealed and the refrigerant charge is perfect. Professionals use "Digital Manifolds" to ensure the system is tuned to the manufacturer's exact specifications. Our tool provides the "Potential Savings," but if your ducts are leaking air into your attic, you may only see 70% of those gains. We recommend using this calculator in conjunction with our "Attic Insulation" tool to maximize your home's thermal efficiency. Finally, remember that Variable-Speed Technology is what enables the highest SEER2 ratings. While a "Single-Stage" unit is either 100% on or 100% off, a variable-speed unit can run at 25% capacity for long periods, which removes more humidity and uses significantly less power. Our tool allows you to see the financial benefit of these premium systems, helping you decide if the higher upfront price is worth the decade of lower utility bills.