As a trusted wire harness supplier, we manufacture custom HVAC cable harnesses for residential HVAC units, commercial air systems, and industrial ventilation equipment.
We build every HVAC wire harness to match your specific part configurations, voltage requirements, and control board layouts.
We assemble HVAC wire harnesses for system manufacturers, parts distributors, and HVAC service teams supporting commercial and residential HVAC, air conditioning, and heating equipment. Each HVAC cable harness is manufactured according to customer-provided technical drawings, including circuit board layouts, connector types, lead lengths, and pin configurations.
With factories in China and the Philippines, we deliver high-volume production and small-batch harness replacements with consistent voltage, control, and relay integration.
HVAC wiring harnesses connect electrical components across heating, ventilation, and air conditioning systems. Each application requires specific cable routing, voltage tolerance, and connector compatibility to maintain safe and reliable performance across varying temperature, moisture, and load conditions.
HVAC wire harnesses in residential systems connect components like blower motors, fan relays, thermostats, and circuit boards.
These assemblies are often routed through compact air handlers and outdoor condensers, using UL-certified HVAC wires rated for 300V operation and resistant to heat cycling from electric heaters and compressor surge.
Large-scale rooftop units and split systems use HVAC cable assemblies to manage multi-zone temperature control. These harnesses often support multiple transformers, voltage regulators, and control signals routed through dedicated pins and connectors.
Harness insulation must meet flame-retardant UL 94V-0 requirements and withstand extended exposure to rooftop UV and moisture.
We manufacture replacement wire harnesses for furnaces that link ignition modules, limit switches, flame sensors, and blower motors.
These use high-temp PVC or silicone insulation for operation up to 105 °C, with custom-length leads, crimped terminal pins, and connector housings matched to OEMs like Nordyne and Lennox.
In HVAC ventilation systems, our harnesses manage power and signal connections between actuators, sensors, and relay-controlled fan motors.
Each HVAC cable assembly supports efficient airflow regulation through relayed input from building automation control boards. These builds are usually bundled for low EMI and rated for 600V environments.
HVAC harness assemblies in refrigeration units connect pressure sensors, thermostatic controls, compressor relays, and defrost systems. Shielded cables may be included to minimize signal noise. These assemblies are tested for operational current loads up to 15A and built to fit tight enclosures using flexible routing and plug-in terminals.
In HVAC ventilation systems, our harnesses manage power and signal connections between actuators, sensors, and relay-controlled fan motors.
Each HVAC cable assembly supports efficient airflow regulation through relayed input from building automation control boards. These builds are usually bundled for low EMI and rated for 600V environments.
HVAC harness assemblies in refrigeration units connect pressure sensors, thermostatic controls, compressor relays, and defrost systems. Shielded cables may be included to minimize signal noise. These assemblies are tested for operational current loads up to 15A and built to fit tight enclosures using flexible routing and plug-in terminals.
We manufacture HVAC cable harnesses to exact part and circuit specifications, using global sourcing and certified production processes. Each harness is made for reliable connection in heating, ventilation, and air conditioning systems across residential, commercial, and industrial applications.
We produce every HVAC wire harness from customer-supplied drawings, including lead lengths, connector specs, pin assignments, and control board interfaces. We support harness configurations with multi-branch layouts, spliced connections, and labeled termination for easy field installation or system replacement.
We source wire insulation types, including PVC, XLPE, and silicone, rated for operating ranges of 105 °C to 150 °C, compliant with UL and RoHS standards. Jacketed HVAC cables meet UL 94V-0 flame resistance and are suitable for use in proximity to heat exchangers, motors, and ignition systems.
Our production lines include semi-automated crimping machines for 22 to 10 AWG wire gauges and common HVAC plug types. We support crimp-on and soldered terminals, Molex and AMP connectors, and keyed housings for control circuits, relays, or transformer inputs. Pull-force tests validate all terminal integrity.
Each harness can be labeled using heat-shrink tubing, self-adhesive tags, or laser-marked insulation for part number tracking and maintenance reference. These markings are resistant to oil, condensation, and thermal cycling, supporting field diagnostics and HVAC wire harness replacement work.
Our HVAC harnesses are made to connect directly to control boards, with routed signal leads for relays, voltage inputs, and transformer windings. Circuit board connectors can be keyed to match OEM carrier layouts, with wire bundling strategies to reduce EMI and prevent pin misalignment.
We support sample runs for field-testing or legacy system repair with lead times of under 7 days. These HVAC wire harnesses follow the same QA protocols as mass production, including 100% continuity testing, visual inspections, and dimensional checks for accurate plug-and-play use.
Cloom Tech maintains volume capacity exceeding 10,000 units per hour, with HVAC wire and connector procurement from suppliers like Arrow, TE Connectivity, and Yazaki. Our factories in China and the Philippines enable flexible delivery schedules, high consistency, and competitive pricing.
We manufacture HVAC wire harnesses strictly from your technical drawings and BOMs.
Every lead, plug, and control board connector is built to match your part numbers, voltage specs, and pin configurations with zero deviation across batches.
Our facilities are ISO 9001 and IATF 16949 certified, and we build every HVAC cable to IPC/WHMA-A-620 Class 2 or Class 3 workmanship standards.
We support RoHS and UL compliance for systems that require full certification and traceability.
We assemble high-complexity HVAC harness layouts involving multiple relay triggers, transformer connections, and control modules.
Our technicians are trained to assemble wire junctions, splices, and overmolded strain reliefs without compromising circuit integrity.
Prototypes ship in as little as 2 to 3 weeks, while production runs scale to 10,000+ pieces per hour using semi-automated crimping and cutting machines.
This allows us to fulfill both one-off prototype samples and OEM supply contracts with minimal lead times.
Each HVAC wiring harness undergoes continuity testing, pull testing, and visual inspection before shipment.
We also conduct terminal crimp validation and insulation damage checks to catch assembly errors before final packing.
We source HVAC connectors, terminals, and wires from trusted suppliers like Molex, Yazaki, Amphenol, and TE.
Our procurement team screens and verifies all materials to guarantee connector compatibility and reduce part substitution risks.
Every HVAC wiring harness is tested against electrical, mechanical, and visual inspection standards to guarantee field reliability. Our multi-stage QA process detects continuity issues, crimp defects, insulation faults, and assembly errors before shipment.
Each harness is connected to a calibrated cable/harness tester (e.g., BT-98811) to verify full circuit continuity. The system checks for open lines, shorts, crossed connections, and resistance abnormalities across all HVAC wires, relay leads, and board plug terminations.
We perform tensile strength testing on crimped terminals to validate mechanical integrity. Terminals must pass pull-force thresholds based on wire gauge (20 to 50 N for 22 to 14 AWG wires used in HVAC cable assemblies), ensuring they stay intact during system vibration and maintenance.
Visual inspections confirm there is no damage to the HVAC wiring harness jacket or exposed wire insulation. We check for insulation nicks, improper stripping, and jacket burn-through from over-crimping or soldering, especially near heater circuits and high-voltage transformer inputs.
Technicians verify each connector is fully seated, with correct pin alignment and no deformation. We use inspection jigs to confirm that all relay sockets, plug housings, and control board headers meet OEM depth and orientation requirements, reducing plug misfit risks.
All HVAC wire harnesses are labeled with part IDs, production date codes, and routing markers using heat-shrink or self-adhesive labels. Label placement is verified to match your drawing specifications and remains readable after exposure to humidity, vibration, or temperature cycling.
Technicians verify each connector is fully seated, with correct pin alignment and no deformation. We use inspection jigs to confirm that all relay sockets, plug housings, and control board headers meet OEM depth and orientation requirements, reducing plug misfit risks.
All HVAC wire harnesses are labeled with part IDs, production date codes, and routing markers using heat-shrink or self-adhesive labels. Label placement is verified to match your drawing specifications and remains readable after exposure to humidity, vibration, or temperature cycling.
We craft each product to ensure reliability, security, durability, and optimal performance.
Hear from some of our happy customers:
We sincerely appreciate the professionalism you’ve demonstrated. Your effort to thoroughly understand the project lays a solid foundation for a successful collaboration.
We are excited about the possibility of working together on future projects and are confident that this collaboration will continue to thrive. Thank you for your hard work and dedication!
Thank you for sharing such thoughtful and detailed questions. Your meticulous approach and depth of inquiry reflect your genuine commitment to achieving a high-quality outcome.
By asking the right questions and paying close attention to every detail, you’ve demonstrated a level of professionalism and care that sets you apart. We look forward to continuing this collaboration and are confident in the quality of results you will bring.
Everything arrived in perfect condition, surpassing our expectations in both quality and service. Cloom Tech’s dedication to excellence made this project a great success.
Your professionalism and hard work were outstanding, and we’re excited to partner with you again on future projects with complete confidence and trust.
Thank you for delivering our custom wiring harnesses on time and meeting all our quality expectations. The shipment was prompt, and every item passed inspection perfectly.
Your dedication to detail and excellence truly sets you apart as a trusted partner. We’re excited to continue working together on future projects!
I received the shipment of cable assembly and wanted to take a moment to thank you and your amazing team.
The quality of the work is fantastic, and I’m genuinely impressed. Well done to everyone involved! Your dedication and attention to detail are truly appreciated. I look forward to continuing our collaboration.
FAQ’s
Most HVAC cable harnesses use wire gauges between 22 AWG and 14 AWG, depending on the current load. Low-voltage signal lines for thermostats and sensors typically use 22 to 20 AWG, while power leads for motors, heaters, or transformers often require 16 to 14 AWG wires rated for 300V or 600V, with insulation rated up to 105 °C or higher.
Yes, we assemble HVAC wire harnesses using OEM-specified connectors, including Molex, TE Connectivity, Yazaki, Amphenol, and JST. Customers must provide the connector part number or drawing. All crimp terminals are matched to the pin specification and validated using die-specific crimp tooling.
Our HVAC wire harnesses are manufactured under ISO 9001 and IATF 16949 quality systems. Testing includes 100% continuity, crimp pull testing, and terminal fit validation. Harnesses can be built to comply with IPC/WHMA-A-620 Class 2 or Class 3 workmanship standards and include UL-compliant wire and components where required.
Yes, we build harnesses with multi-lead outputs to match dual-speed fan motors, compressor relays, or transformer taps. Voltage-specific routing can be achieved using color-coded wires, separate terminal blocks, or keyed plug connectors, depending on the HVAC system’s control scheme.
Our technicians are ready to assemble your custom HVAC cable harness built to your exact voltage, connector, and control layout requirements. Full compliance and global delivery.
