As a sauna, Red Cedar is better suited for outdoor use than Hemlock. Durability: Red cedar: service life can be 30-40 years or longer. Hemlock: service life is typically 10-20 years. Red cedar typically has a longer service life and better resistance to decay than hemlock. Heat Resistance: · Red Cedar: Resistant to temperatures up to 212°F (100°C). · Hemlock: Resistant to temperatures up to 180°F (82°C). · Red cedar can withstand higher sauna conditions and natural environments than hemlock. Moisture Resistance: · Red cedar: has naturally high moisture resistance. · Hemlock: has moderate moisture resistance. · Red cedar usually has an advantage over hemlock and is more suitable for use in environments with higher humidity. Aesthetic appearance: · Red cedar: rich color and unique texture. · Hemlock: smooth grain and consistent color. · Red cedar usually has more character, while hemlock is more simple. Maintenance Requirements: · Red Cedar: requires less maintenance. · Hemlock: requires regular maintenance to prevent rot. · Red cedar usually requires less maintenance, while hemlock may require more frequent maintenance. Health Effects: · Red Cedar: non-toxic, natural cedar aroma. · Hemlock: non-toxic, but may cause respiratory irritation in some people. · Hemlock may cause some discomfort in certain situations.