RecruitingProcedureCold and Heat Investigation to Lower Levels of DepressionThis study will recruit 112 medically healthy adults (aged 18-65) currently experiencing depressive symptoms to be randomized to receive either a single Whole Body Hyperthermia (heat therapy) treatment or a Whole Body Hyperthermia treatment followed by a cold water plunge. Participants will complete a baseline assessment of their depressive symptoms as well as 1-week and 2-week post-treatment followup assessments.