The Healthy at Home on Base Act of 2024 directs the Secretary of Defense to conduct a comprehensive study on how indoor mold in military housing affects service members' and their families' health. The study, which must be completed within three years, will examine detection methods, health risks from mold exposure, and the impact on military readiness, with input from multiple federal agencies including the CDC, EPA, and HUD. Based on the study's findings, the Defense Department must develop model standards for preventing, detecting, and treating mold in military housing and require these standards in new construction and rehabilitation projects within one year after publication. The bill also requires the military to train health professionals on recognizing and treating mold-related illnesses, and the model standards must be reviewed and updated every five years to reflect the latest scientific evidence. The legislation has no specific budget authorization listed but establishes multiple deadlines ranging from one to three years for completing the study, developing standards, and publishing guidelines for military installations nationwide.