Huafeng Li

HVAC Technician with hands-on commercial HVAC service experience at Lennox National Account Services (NAS). Experienced in independent diagnostics, troubleshooting, preventive maintenance, component-level repair, refrigerant service, and customer communication.

Since

March 2026, independently diagnose HVAC system problems, identify root causes, determine repair requirements, and communicate findings and recommendations directly to customers. Strong electrical engineering background with practical experience servicing RTUs, heat pumps, gas furnaces, split systems, mini-splits, economizers, and VFD-controlled equipment.

HVAC Service Technician - Lennox National Account Services (NAS)

(2025-07)

• Diagnose, troubleshoot, service, and repair commercial HVAC systems, including RTUs, heat pumps, gas furnaces, split systems, and mini-split systems.
• Since March 2026, independently diagnose HVAC system problems, identify root causes, determine repair requirements, and communicate findings and recommendations directly to customers.
• Independently diagnose and replace HVAC electrical, mechanical, and control components, including compressors, motors, capacitors, contactors, control boards, thermostats, pressure switches, and other system components.
• Diagnose and repair refrigerant-related problems, including refrigerant leaks, refrigerant charging, recovery, system evacuation, and vacuum procedures.
• Troubleshoot electrical circuits, HVAC controls, economizers, and VFD-controlled equipment using systematic diagnostic procedures and electrical testing.
• Perform preventive maintenance, equipment inspections, system testing, component replacement, and repairs in accordance with manufacturer specifications and safety procedures.
• Analyze equipment operating conditions, electrical measurements, and system performance to identify malfunctioning components and determine appropriate repair actions.
• Maintain professional customer relationships while working independently in commercial service environments.

Technical Sales / Engineering / Management Roles - Siemens, Tyco & Other Building Systems Companies - China

(1998 - 2016)

• Held technical, engineering, sales, and management positions involving electrical, fire protection, and building systems.
• Managed large B2B projects involving technical coordination, bidding, and project execution.
• Worked with MEP professionals, engineers, contractors, and customers on technical requirements and project solutions.
• Reviewed technical specifications and coordinated technical requirements for building-system projects.
• Supported technical proposals, project planning, and customer requirements.
• Developed strong electrical, technical problem-solving, project coordination, and customer communication skills.

Associate of Applied Science - Air Conditioning & Refrigeration - Northern Virginia Community College (2027)

Bachelor - Electrical Power Engineering - Huazhong University of Science & Technology (1998)