If you wanted to save some money by learning how to check your home for air leaks, poor insulation, and power-hungry lightbulbs, the Department of Energy’s website was ready to help. And if you needed an expert, the site guided you to another page for help lining up a professional energy assessment, a well-established first step to cut utility bills and curb pollution at the same time. That is, until this summer, when both of those resources vanished from the agency’s site, each now redirecting to “Page not found.” They were taken down by July 3, around the same time that the Department of Energy deleted more than 1,600 pages from the Energy Saver section of its site, gutting a resource for people looking to conserve energy and lower bills. “I can’t remember another time that, with DOE specifically, we’ve seen an entire domain go down the way that [it] has been reported on now,” said Izzy Pacenza, who monitors government websites for the Environmental Data and Governance Initiative. Over a 30-day span this summer, as swaths of the country suffered under heat waves, more than 300 of the webpages had received 160,000 page views, according to an analysis from The Guardian.

The news coverage of the missing websites has focused on the disappearance of one recommendation in particular. Ahead of a heat wave that roasted New York City with 100-degree temperatures earlier this month, Mayor Zohran Mamdani asked businesses and residents to set their AC to 78 degrees to conserve energy, drawing the ire of Republicans who mocked the restrictions as “socialism.” Internet sleuths were quick to notice that similar guidance had vanished from the Department of Energy’s website, which used to direct people to keep their thermostat between 75 and 78 degrees. The timing suggested that the agency might have removed the pages as a rebuke to Mamdani’s advice.