SEER and Furnace Savings Calculator

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Understanding SEER and SEER2 Ratings

SEER (Seasonal Energy Efficiency Ratio) and SEER2 are metrics used to measure the efficiency of air conditioning and heat pump systems. Higher SEER or SEER2 ratings indicate greater energy efficiency. You can typically find the SEER rating of your existing equipment on the yellow EnergyGuide label affixed to the unit or in the manufacturer's product manual. For SEER2, introduced in 2023, this information is also found on updated EnergyGuide labels and product specifications.

HSPF and EER

HSPF (Heating Seasonal Performance Factor) measures the heating efficiency of heat pumps. A higher HSPF rating indicates better heating performance for less energy use. EER (Energy Efficiency Ratio) measures the cooling efficiency of air conditioners and heat pumps under specific conditions. While SEER reflects seasonal efficiency, EER represents efficiency at a set outdoor temperature and humidity level. Both metrics are useful for understanding system performance in different scenarios.

Difference Between a Heat Pump and an Air Conditioner

While both heat pumps and air conditioners provide cooling, heat pumps also offer heating by reversing the refrigeration cycle. Heat pumps are an excellent choice for areas with milder winters, such as the Seattle area, as they can efficiently handle both heating and cooling needs with one system.

Understanding Tonnage

The term "tons" or "tonnage" in HVAC refers to the cooling capacity of an air conditioning or heat pump system. One ton equals 12,000 BTUs (British Thermal Units) of cooling per hour. For example, a 3-ton system can remove 36,000 BTUs of heat per hour. You can find the tonnage of your system in the product manual, on the system’s nameplate, or by consulting with your HVAC professional.

Identifying Furnace Efficiency (AFUE)

Furnaces are rated based on their AFUE (Annual Fuel Utilization Efficiency). Furnaces in the 80% range typically have a metal exhaust pipe and rely on natural draft or a fan for venting combustion gases. In contrast, furnaces in the 90% range or higher feature PVC (plastic) exhaust pipes, as they are designed to extract more heat from combustion and expel cooler exhaust gases.

Minimum Efficiency Standards in Washington State

Washington State is part of the "North" region under federal efficiency standards. As of January 1, 2023, the minimum efficiency requirements are:

• Central Air Conditioners: Minimum SEER2 of 13.4.
• Heat Pumps: Minimum SEER2 of 14.3 and HSPF2 of 7.5.
• Furnaces: Minimum AFUE of 90% for gas furnaces in the North region. These standards apply to all new installations, with a few exceptions, and ensure systems are energy efficient and environmentally friendly.

Disclaimer

This calculator uses data sourced from reputable organizations, including the U.S. Bureau of Labor Statistics, U.S. Energy Information Administration, and Oak Ridge National Laboratory, to provide accurate energy savings estimates for residents in the greater Seattle area. However, please note that this tool is for informational purposes only. Actual savings may vary based on factors such as system usage patterns, local climate variations, equipment condition, and installation quality.