In 2006, what was the minimum SEER rating mandated for heat pumps and air-conditioning systems?

In 2006, the U.S. Department of Energy established a national minimum standard for the efficiency of air-conditioning systems and heat pumps, which was set at 13 SEER (Seasonal Energy Efficiency Ratio). This standard was a part of an effort to improve energy efficiency and reduce energy consumption across the country. By mandating a minimum SEER rating of 13, the government aimed to encourage the installation of more efficient cooling systems that consume less electricity while providing the same level of cooling output. Systems with a SEER rating below this threshold were considered outdated and less energy-efficient, which contributed to higher energy costs and greater environmental impact.

The standards represent a significant increase from previous requirements, reflecting advancements in technology and the need for greater energy conservation. This shift not only helps homeowners save on energy bills but also supports a reduction in greenhouse gas emissions associated with energy production.