Indoor environment is a complex term, comprising the physical space of occupied areas in buildings or vehicles and habitation conditions. The organization of an inhabitant friendly indoor environment is an obligation of the operational staff of buildings, transport, and infrastructure. The indoor environment conditions are close to those in planes and luxury ships. A favorable and comfortable indoor environment can be attained employing two architectural-engineering technologies such as: passive technologies and active technologies. The first type exploits the functional properties of the envelope of an object to filter environmental impacts such as solar radiation, wind, humidity, and aerosol emissions. The second type uses energy generated in central or local power stations. The energy audit is performed by certified specialists but after winning a competition organized by the building managers in conformity with the law and regulations of placing a public order.