Troubleshoot hvac equipment, replace compressors, rebuilt compressors (heads, oil pumps, etc.) Replace hvac equipment (roof top units, condenser coils, evaporator coils, etc.) Repair vav boxes, work, troubleshoot Pneumatic controls, repair and replace electric heaters. Worked on cooling towers, chillers (clean, punch tubes). Worked on motors (trouble shooting, and repair motors). Rebuilt circulating pumps, troubleshooting, repair, and clean boilers.