Real-time application metrics of an application executed by a virtual machine are dynamically monitored by a controlling agent and analyzed to determine an optimal configuration of the virtual machine for executing the application. In one example, recirculation of air from one or more rooms in a multiple room ventilated environment having a common source of supply air is controlled such that minimum ventilation and thermal load requirements for each room are satisfied independently, so as to facilitate a reduction in the amount of fresh outside air required for the environment. A processor that captures and processes the measured values and an interface to a bus system are arranged in the housing. The use of local classifiers also results in memory, storage and performance improvements, especially when the classifier is kernel-based. In an alternating current circuit, the parallel group device is preferably two back-to-back zener diodes held in a partially on status so that, in the event one of the bulbs fails, it more quickly passes current in the reverse direction, thus preventing the remaining, operating lights from experiencing a current surge.