Southwire 18-8CS Hybrid Thermostat Wire 18AWG 8C 250ft

Product Description

The SOUTHWIRE 18-8CS is an 18 AWG, 8-conductor hybrid thermostat wire designed for low-voltage control wiring in HVAC systems. This wire provides reliable signal transmission between thermostats, air handlers, furnaces, heat pumps, and other HVAC control components. The hybrid construction supports modern multi-stage and communicating system installations where multiple conductors are required. It is installed by licensed HVAC technicians as part of new system installs, equipment changeouts, or thermostat upgrades requiring additional conductors.

This thermostat wire is suited for residential and light commercial HVAC applications where 8-conductor, 18 AWG low-voltage control wiring is required. Common installation scenarios include multi-stage heating and cooling systems, heat pump systems with auxiliary heat, and zoning control setups that require dedicated conductors for each control function. The 250-foot roll provides enough length for most residential installations without mid-run splices.

Key Features

• 18 AWG wire gauge suitable for low-voltage HVAC control circuits
• 8 conductors provide dedicated wiring paths for multi-stage and multi-function control
• 250-foot roll length minimizes the need for splices in standard residential installations
• Hybrid construction designed for modern communicating and conventional HVAC systems

Compatibility

Designed as an OEM-style replacement and new-installation thermostat wire for residential and light commercial low-voltage HVAC control systems requiring 18 AWG 8-conductor wiring.

Installation Notes

Installation should be performed by a qualified HVAC technician in accordance with applicable local codes and NEC low-voltage wiring guidelines. Always de-energize the HVAC system at the disconnect and confirm power is off before pulling or terminating control wire. Avoid running thermostat wire in the same conduit as line-voltage conductors. Secure wire runs with appropriate staples or clips to prevent abrasion and strain at terminal connections.

Technical Specifications

• Wire Gauge: 18 AWG
• Number of Conductors: 8
• Roll Length: 250 feet
• Wire Type: Hybrid Thermostat Wire

Standard Information

• Brand: SOUTHWIRE
• Manufacturer Part Number: 18-8CS