37 Installation, maintenance and repair of heating, air conditioning, indoor air quality, water heating and pool heating equipment for homes and businesses; installation of industrial ductwork and piping; construction management, namely management and coordination of heating plan conversions, high purity water and process piping systems installations, fire protection systems installations, wastewater systems installations, plumbing and power piping systems installations and cogeneration systems installations; facilities management services, namely, maintenance and repair of boiler, chiller, refrigeration, industrial piping and engine systems and building automation and control; pipeline projects, namely, gas pipeline installation and repair; planning and laying out of power plant facilities