bes-tech inc. is a leader in demand response management, sustainable energy efficient building solutions, patented technologies, and engineering consulting services with specialization in facility commissioning, heating ,ventilation, and air-conditioning (hvac)systems, energy management control systems (emcs), pump flow, fan flow, and air flow meters, rooftop unit (rtu) optimization and retrofits, system controllers, control automation , water source heat pumps, and water supply and treatment services for attaining optimal energy savings.