WJ O'NEIL

About Us

Established in 1983, we specialize in industrial and commercial HVAC installations and service. It is our “Commitment to Excellence” that’s
guaranteed. W.J. O’Neil Company is a leader in industrial and commercial HVAC installations, service, and preventive maintenance programs. We have been serving Southeast Michigan for over 40 years as a Full-Service MEP (mechanical, electrical & plumbing) contractor. We provide, install and service all types of HVAC equipment, including chillers, cooling towers, boilers, pumps, roof top units, air handlers, make up air units, heat pumps, and server room units. We also self-perform electrical, plumbing, and service and install building automation control systems. We have full mechanical contracting capabilities for new construction projects as well as renovations and tenant build outs. To bring more value to our customers, we can engineer, plan and offer design/build services for all HVAC system projects. In addition, we also perform pipe fabrication for process piping, sheet metal fabrication and sheet metal installations. We are your single source for all of your HVAC, plumbing and electrical needs to optimize your building performance!