Proper control of HVAC systems is crucial for efficient and economical building operation. However, mistakes are often made that unnecessarily increase costs. Their solution is diagnostics based on standardised labels and self-adjusting controllers capable of automatically optimising building operation and minimising human error. As part of the RoboPID project, UCEEB CTU, in collaboration with ENERGOCENTRUM PLUS, developed a new controller and successfully tested it on more than thirty installations in real buildings.