Compressed air drying applications that simply want seasonal protection against freezing are exactly what the standard heated desiccant dryers are designed to address. Standard models automatically provide ISO 8573.1 Class 2 (-40°C/-40°F) dew points to protect usage points from freezing during the winter months and, Class 3 (-20°C/ -4°F) dew points to keep air systems nice and dry all summer long.