When selecting the best portable saunas, we also considered the materials and power output to find energy-efficient options that won’t send your power bill skyrocketing. Best portable saunas: Reviews & RecommendationsOnce relegated to the realm of gyms and spas, saunas have exploded in popularity as medical studies have demonstrated that they can relieve pain and promote relaxation. As one of the only full-sized, fully portable saunas on the market at this price point, the SereneLife is at the top of our list for best portable sauna kit. Unlike dry saunas, steam saunas use a heater with water to warm up your space. Final thoughts on the best portable saunasFor those who can afford it and have the dedicated space, the SaunaSpace Luminati is one of the best portable saunas available.