High/Low Voltage Wire & Accessories

Power and control your system with High/Low Voltage Wire & Accessories designed for clean, safe installs. From thermostat wire to outdoor whips, get budget-friendly HVAC wiring solutions that fit your job.

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High/Low Voltage Wire & Accessories

Build reliable connections for residential and light commercial systems. Our selection covers low-voltage thermostat/control cable (commonly 18-gauge, 2-8 conductors), high-voltage power leads, liquidtight whips, termination hardware, and organization aids. Whether you are a DIY-capable homeowner, a licensed contractor, or a property manager, choose the right cable and accessories to keep runs secure, labeled, and compliant indoors or outdoors.

Use these products for running thermostat wire and control wiring, connecting low-voltage accessories like sensors and thermostats, routing high-voltage power leads to condensers and air handlers, repairing or extending existing HVAC wiring, and organizing and terminating conductors with accessories. Options include solid or stranded copper, UV/sunlight-resistant jackets for condenser areas, and abrasion-resistant fittings that protect entry points and equipment knockouts.

While comfort systems are often compared by SEER2, HSPF2, BTU, tonnage, and refrigerant type, wiring and accessories are compatibility-driven rather than performance-rated. That means these components work across equipment using common refrigerants and efficiencies. Focus on gauge, conductor count, jacket rating (plenum/CMP, riser/CMR, general purpose, or outdoor UV), temperature rating, and the correct terminals for your board or disconnect.

Top Brands for High/Low Voltage Wire & Accessories

Shop dependable value from Generic, jobsite-ready pieces from Burton, and precision tools from Hanbon, plus select items from Mitsubishi, ProParts, and Southwire to finish any wiring task the right way.

Frequently Asked Questions

  • What gauge and conductor count wire should I use for a thermostat or low-voltage controls?

    Most thermostats use 18 AWG. Choose 18/5 for standard furnaces and AC, 18/7-18/8 for heat pumps or accessories like humidifiers and sensors.

  • When is high-voltage wire required versus low-voltage thermostat wire in HVAC installs?

    Use high-voltage (120/208/240V) for powering condensers and air handlers. Use low-voltage (typically 24V) cable for thermostat and control circuits.

  • Are these wire and accessories suitable for outdoor/condenser use and sunlight/UV exposure?

    Yes-choose UV/sunlight-resistant cable or run THHN/THWN in conduit with liquidtight whips and UV-rated ties for durability and code compliance.

  • Can I DIY replace thermostat wiring, or should a licensed contractor handle it?

    Low-voltage thermostat wiring is often DIY-friendly with power off and proper labeling. High-voltage work should be handled by a licensed pro.

  • What code or safety considerations apply when routing HVAC control and power wiring?

    Follow NEC and local codes: use proper jacket ratings, protect penetrations with bushings, separate high/low voltage, secure with clamps, and maintain clearances.

  • Do I need stranded or solid conductors for my furnace/air handler connections?

    Solid 18 AWG is common for thermostat/control terminals. Stranded conductors are preferred where vibration is present or for lug-style equipment terminations.

  • How do I choose the correct length and jacket rating (plenum/CMR/UV) for my application?

    Measure the run and add slack for service. Use CMP in air returns, CMR for risers, general-purpose or UV-rated jackets for conditioned and outdoor areas.

  • What accessories are recommended for terminating and protecting high/low voltage runs?

    Use wirenuts or ferrules, spade/ring terminals, butt splices with heat-shrink, liquidtight whips, strain reliefs, bushings, and labeled cable ties.

  • Are these products compatible with all HVAC brands and refrigerants?

    Yes. Wiring and accessories are brand-agnostic and work with systems regardless of SEER2, HSPF2, BTU, tonnage, or refrigerant type.

  • How do I handle voltage drop on long low-voltage runs?

    For long distances, upsize to 16 or 14 AWG, minimize splices, and verify transformer VA capacity to maintain stable 24V control signals.

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