The Lead by Example Act of 2023 requires the Department of Energy and Environmental Protection Agency to set thermostats at their headquarters buildings to a minimum of 78 degrees Fahrenheit when air conditioning is in operation. The bill is intended to demonstrate government energy conservation practices by reducing air conditioning use at these two agencies. Within 90 days of the law's enactment, both agencies must submit reports to Congress documenting what temperatures their thermostats were set to from January 20, 2021, through the date the law takes effect. The legislation contains no specific funding provisions or extended timelines beyond the initial reporting requirement. This bill affects only the federal employees and operations at DOE and EPA headquarters buildings.