Custom Wiring and Assemblies for HVAC Equipment, Made in Mexico
Shelmex builds wire harnesses, cable assemblies, and electronic assemblies for heating, ventilation, and air conditioning brands, made to your drawings at our plants in Nuevo León.
We work with equipment manufacturers; we do not sell, install, or repair HVAC units.
What We Build for HVAC Equipment
Each part follows your drawings and specifications. Here are some of the components we build for HVAC brands:
Power and control harnesses for air conditioners, inverter units, condensers, and thermostats.
Point-to-point power and control cables for climate equipment.
Control boards, thermostat assemblies, and power units mounted and wired for your equipment.
Built for the Conditions HVAC Equipment Faces
HVAC equipment runs hot, cold, outdoors, and around the clock. We build each harness for the job it has to do:
Harnesses that carry primary current in large air conditioning units.
Signal runs for thermostats, sensors, and speed controls.
Small form harnesses for mini splits and portable units.
Built to handle freezing temperatures, vibration, and dust, with IP68 ratings for demanding outdoor equipment.
Fiber optic harnesses for next generation and connected HVAC units.
Why HVAC Brands Choose Shelmex
- A certified harness operation: our wire harness operation has been ISO 9001 certified since 2016.
- Wiring and electronics together: harnesses, cables, and electronic assemblies come from the same team, which simplifies your supply chain.
- Built to print: we work from your drawings, samples, or a reference part.
- Close to your U.S. operations: Nuevo León is about two hours from Texas, close to your U.S. customers.
- Experience since 1996: companies from around 30 countries manufacture with us.
Planning a New HVAC Program?
Tell us what your equipment needs, and our team will review the wiring and assemblies with you.
Frequently Asked Questions
Do you install or repair HVAC systems?
No. Shelmex is a manufacturing partner for HVAC equipment brands. We build wiring and assemblies to their specifications; we do not sell, install, or service HVAC units.
Which HVAC components can you build?
Wire harnesses for air conditioners, inverter units, condensers, thermostats, and blower motors, plus cable assemblies and electronic assemblies such as control boards and power units. If your part is not listed, send us the drawings and we will review it.
Can you build wiring for outdoor HVAC units?
Yes. We build harnesses for demanding outdoor equipment, including options rated for freezing temperatures, vibration, and dust (IP68).