The "Safe Temperature Act of 2025" grants the Secretary of Housing and Urban Development (HUD) authority to ensure a comfortable and safe temperature level in certain federally assisted housing units. Specifically, it mandates a temperature range of 71 to 81 degrees Fahrenheit for these dwellings. The bill amends existing law to allow the Secretary to require owners of project-based assisted units and supportive housing for the elderly to maintain this temperature standard. For public housing units, it further permits the use of Capital Fund or Operating Fund amounts to ensure compliance with the specified temperature range.