Mr Rios has already found tens of thousands of corporate heating, air-conditioning and ventilation systems online, many with vulnerabilities in their software that a hacker could exploit.

With the increasing demands on indoor environment quality and energy consumption in modern buildings, heating, ventilation, air-conditioning systems become more and more complex.

Ventilation andspot cooling systems will carefully planned in areas that generate aboveaverage heat, such as Major Laundry, Guest Laundry and Dry Cleaning, Bakeriesand Employee cooking areas.