Thermostat Wire
Thermostat & HVAC Control Wire
Solid copper thermostat wire for heating, cooling, and low-voltage control wiring. This Class 2 (CL2) power-limited cable is available in 18 and 20 AWG with 2 through 12 color-coded conductors under a durable brown PVC jacket, including Southwire Baron and mixed-gauge 8-conductor options. It’s rated 150V per NEC Article 725 and ETL listed to UL 13 — the everyday standard for connecting thermostats, zone controls, HVAC equipment, doorbells, alarms, and signal circuits.
Choose your conductor count to match the system (a two-wire signal, a heat-pump control run, or a multi-function zone board) and pick the put-up that fits the project, from 125′ and 250′ coils and spools up to 2500′ reels. Need plenum-rated cable for air-handling spaces? See our Plenum (CL2P) selection.
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Southwire Baron 18/2 Solid Copper Thermostat Wire — 18 AWG 2-Conductor CL2, Brown
Read moreSKU: SW-BARON-18-2
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Southwire Baron 8-Conductor Mixed Gauge Solid Thermostat Wire — Brown
Read moreSKU: SW-MG-8C
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Southwire Baron 18/2 Solid Copper Plenum Thermostat Wire — 18 AWG 2-Conductor CL2P 300V, White, 500′ Spool
Read moreSKU: 555020523
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Southwire Baron 18/3 Solid Copper Thermostat Wire — 18 AWG 3-Conductor CL2, Brown
Read moreSKU: SW-BARON-18-3
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Southwire Baron 18/3 Solid Copper Plenum Thermostat Wire — 18 AWG 3-Conductor CL2P 300V, White, 500′ Spool
Read moreSKU: 555030523
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Southwire Baron 18/4 Solid Copper Thermostat Wire — 18 AWG 4-Conductor CL2, Brown
Read moreSKU: SW-BARON-18-4
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Southwire Baron 18/4 Solid Copper Plenum Thermostat Wire — 18 AWG 4-Conductor CL2P 300V, White, 250′ Spool
Read moreSKU: 555040423
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Southwire Baron 18/5 Solid Copper Thermostat Wire — 18 AWG 5-Conductor CL2, Brown
Read moreSKU: SW-BARON-18-5
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Southwire Baron 18/5 Solid Copper Plenum Thermostat Wire — 18 AWG 5-Conductor CL2P 300V, White, 250′ Spool
Read moreSKU: 555050423
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Southwire Baron 18/6 Solid Copper Thermostat Wire — 18 AWG 6-Conductor CL2, Brown
Read moreSKU: SW-BARON-18-6
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Southwire Baron 18/6 Solid Copper Plenum Thermostat Wire — 18 AWG 6-Conductor CL2P 300V, White, 250′ Spool
Read moreSKU: 555060423
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Southwire Baron 18/7 Solid Copper Thermostat Wire — 18 AWG 7-Conductor CL2, Brown
Read moreSKU: SW-BARON-18-7
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Southwire Baron 18/8 Solid Copper Plenum Thermostat Wire — 18 AWG 8-Conductor CL2P 300V, White, 250′ Spool
Read moreSKU: 555080423
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Southwire Baron 18/8 Solid Copper Thermostat Wire — 18 AWG 8-Conductor CL2, Brown
Read moreSKU: SW-BARON-18-8
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Southwire Baron 18/10 Solid Copper Plenum Thermostat Wire — 18 AWG 10-Conductor CL2P 300V, White, 250′ Spool
Read moreSKU: 555100423
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Southwire Baron 18/10 Solid Copper Thermostat Wire — 18 AWG 10-Conductor CL2, Brown
Read moreSKU: SW-BARON-18-10
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18/2 Shielded Stranded Plenum Thermostat Cable — 18 AWG 2-Conductor CL2P 300V, White, 500′ Spool
Read moreSKU: P40133-1C
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Southwire Baron 18/12 Solid Copper Thermostat Wire — 18 AWG 12-Conductor CL2, Brown, 250′ Spool
Read moreSKU: 553120407
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18/3 Shielded Stranded Plenum Thermostat Cable — 18 AWG 3-Conductor CL2P 300V, White, 500′ Spool
Read moreSKU: P40032-1C
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Southwire Baron 20/2 Solid Copper Thermostat Wire — 20 AWG 2-Conductor CL2, Brown, 500′ Spool
Read moreSKU: 552020507
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18/4 Shielded Stranded Plenum Thermostat Cable — 18 AWG 4-Conductor CL2P 300V, White, 500′ Box (POB)
Read moreSKU: P40073-1D
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Southwire Baron 20/3 Solid Copper Thermostat Wire — 20 AWG 3-Conductor CL2, Brown, 500′ Spool
Read moreSKU: 552030507
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18/6 Shielded Stranded Plenum Thermostat Cable — 18 AWG 6-Conductor CL2P 300V, White, 500′ Spool
Read moreSKU: P40040-1C
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Southwire Baron 20/4 Solid Copper Thermostat Wire — 20 AWG 4-Conductor CL2, Brown, 250′ Spool
Read moreSKU: 552040407
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18/8 Shielded Stranded Plenum Thermostat Cable — 18 AWG 8-Conductor CL2P 300V, White, 500′ Spool
Read moreSKU: P40070-1C