Living in a basement without windows can pose several challenges and potential negative consequences. Key concerns include poor air quality, with risks of radon gas accumulation and elevated CO2 levels, necessitating proper ventilation. The absence of natural light may lead to vitamin D deficiency and seasonal affective disorder over time. Humidity issues and mold growth are also significant risks, particularly if the basement is not well-ventilated. Additionally, heating systems in basements may be inadequate, and flooding can be a concern depending on the location. Legalities surrounding basement rentals without windows can vary, but such living conditions may be perceived as dreary and could affect mental well-being. While some individuals may find basements quieter and more affordable, it's crucial to ensure that landlords address potential issues like radon, mold, and flooding before committing to a lease.