On June 8, 2026, the U.S. Supreme Court vacated a previous ruling by the D.C. Circuit Court that upheld energy efficiency standards for gas furnaces and water heaters established during President Joe Biden's administration. The case, American Gas Association et al v. Department of Energy (DOE), will now be reviewed by the lower court, which initially supported the Biden-era regulations mandating a 95% efficiency benchmark. The Supreme Court's decision allows the Trump administration to present its arguments against these standards. The Solicitor General's brief argued that the Biden-era rules would have effectively removed non-condensing gas appliances from the market, which typically achieve around 80% efficiency. The American Gas Association (AGA) welcomed the Supreme Court's ruling, emphasizing that the DOE cannot set standards that eliminate entire classes of appliances. The AGA and other industry groups contended that the previous ruling violated the Loper Bright v. Raimondo decision, which requires independent judgment in agency evaluations. Advocacy groups supporting the Biden-era standards argued that the earlier ruling did not violate this standard and that the dispute was fact-specific, not warranting Supreme Court intervention.