A dynamic opening is a type of entrance that is designed to be both visually and functionally impressive. The two crossword solutions, AERO and THERMO, refer to two different types of dynamic openings. AERO stands for Automatic Entrance Revolving Operators, which are automated doors that open and close automatically. THERMO stands for Thermal Entrance Revolving Operators, which are doors that open and close based on the temperature of the environment. Both types of dynamic openings are used in many commercial and residential buildings to provide an efficient and aesthetically pleasing entrance.