Skip to content
Thermostat wire — 18/2 to 18/8 solid copper CMR, 250–500ft reels | Conversions Tech

Thermostat Wire

Bulk thermostat wire for low-voltage HVAC control: two- through eight-conductor, solid bare copper, UV-resistant jacket, CMR riser rated. 250 ft and 500 ft reels, same-day shipping.

10 products

Clear all
Sigma Wire & Cable Bulk Thermostat Wire, 18/2 CMR, 18AWG 2C Unshielded, 500ft Reel (Brown)

Bulk Thermostat Wire | 18/2 CMR, 18AWG 2C Unshielded, 500ft Reel (Brown)

$47.85

Sigma Wire & Cable Bulk Thermostat Wire, 18/3 CMR, 18AWG 3C Unshielded, 500ft Reel (Brown)

Bulk Thermostat Wire | 18/3 CMR, 18AWG 3C Unshielded, 500ft Reel (Brown)

$68.20

Sigma Wire & Cable Bulk Thermostat Wire, 18/4 CMR, 18AWG 4C Unshielded, 500ft Reel (Brown)

Bulk Thermostat Wire | 18/4 CMR, 18AWG 4C Unshielded, 500ft Reel (Brown)

$88.21

Sigma Wire & Cable Bulk Thermostat Wire, 18/5 CMR, 18AWG 5C Unshielded, 500ft Reel (Brown)

Bulk Thermostat Wire | 18/5 CMR, 18AWG 5C Unshielded, 500ft Reel (Brown)

$107.80

Sigma Wire & Cable Bulk Thermostat Wire, 18/6 CMR, 18AWG 6C Unshielded, 500ft Reel (Brown)

Bulk Thermostat Wire | 18/6 CMR, 18AWG 6C Unshielded, 500ft Reel (Brown)

$128.70

Sigma Wire & Cable Bulk Thermostat Wire, 18/8 CMR, 18AWG 8C Unshielded, 250ft Reel (Brown)

Bulk Thermostat Wire | 18/8 CMR, 18AWG 8C Unshielded, 250ft Reel (Brown)

$84.70

Sigma Wire & Cable Bulk Thermostat Wire, 20/2 CMR, 20AWG 2C Unshielded, 500ft Reel (Brown)

Bulk Thermostat Wire | 20/2 CMR, 20AWG 2C Unshielded, 500ft Reel (Brown)

$35.20

Sigma Wire & Cable Bulk Thermostat Wire, 20/5 CMR, 20AWG 5C Unshielded, 500ft Reel (Brown)

Bulk Thermostat Wire | 20/5 CMR, 20AWG 5C Unshielded, 500ft Reel (Brown)

$76.73

Sigma Wire & Cable Bulk Thermostat Wire, 20/8 CMR, 20AWG 8C Unshielded, 250ft Reel (Brown)

Bulk Thermostat Wire | 20/8 CMR, 20AWG 8C Unshielded, 250ft Reel (Brown)

$61.60

Sigma Wire & Cable Bulk TSAT, Thermostat 20/2 CMR, 20AWG, CCA 2C, Unshielded, 500ft Reel (White)

Bulk TSAT | Thermostat 20/2 CMR | 20AWG, CCA 2C | Unshielded | 500ft Reel (White)

$38.50

Online — let me help you!
CT
CONVERSIONS TECH

Professional-grade electrical components, networking cables, and solar hardware for contractors, distributors, and OEM partners. Same-day shipping from our U.S. distribution centers.

1 (307) 206-0534

CS@ConversionsTech.com

Products
Compression lugs Networking & fiber AV & power cable EMT fittings Grounding & bonding Solar & energy Enclosures
Resources
Technical library Lug sizing guide Fiber optic guide AV cable guide Starlink Mini guide AWG conversion chart Cross-reference tool
Company
About & certifications OEM program Marine & RV OEM Pro Pricing program Become a distributor 5-year warranty Contact us
© 2026 Conversions Tech Inc · Wyoming, United States
UL 486A/B CSA NEC 2023 ABYC E-11 IEEE 837
Request a Quote

Get product updates and exclusive pricing