{"product_id":"18-3-100ft-thermostat-wire-solid-copper-cl2-low-voltage","title":"18\/3 100ft Thermostat Wire - Solid Copper CL2 Low Voltage","description":"\u003cp\u003eIn this review of the 18\/3 100ft thermostat wire the bottom line is simple: it is a straightforward, low-voltage cable that suits contractors and DIYers who want a made-in-USA solid copper option for thermostat, doorbell and HVAC control circuits. The review finds the cable notable for its \u003cstrong\u003ehigh conductivity\u003c\/strong\u003e thanks to 100% solid copper conductors and for the reassurance of a lifetime warranty, while also noting that some users describe the jacket as less robust than heavier gauge multi-conductor products.\u003c\/p\u003e\u003ch2\u003eKey Features\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eMade in USA:\u003c\/strong\u003e Manufactured in New York since 1972, the cable gives buyers confidence in origin and consistent production quality.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSolid copper conductors:\u003c\/strong\u003e Each conductor uses premium solid copper for reliable signal and power transmission in low-voltage thermostats and doorbells.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCL2 ETL listed:\u003c\/strong\u003e Rated for in-wall low-voltage installations, making it suitable for residential and many commercial HVAC wiring runs.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMulti-conductor 18\/3 format:\u003c\/strong\u003e Three conductors in an 18 AWG size simplify standard thermostat and control connections without the need for splicing.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eLifetime warranty:\u003c\/strong\u003e Backed by a lifetime satisfaction promise from the manufacturer, which helps protect long-term installations.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eEasy to handle:\u003c\/strong\u003e The 100ft spool length balances convenience and manageability for common installation lengths and reduces waste.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eWho It's For\u003c\/h2\u003e\u003cp\u003eThe cable is best for HVAC technicians, electrical contractors, and capable DIY homeowners who need a reliable \u003cstrong\u003ethermostat cable\u003c\/strong\u003e for typical residential or light commercial systems, including compatibility with many smart thermostats and doorbell circuits. Its solid copper conductors and CL2 listing make it a sensible choice when in-wall routing and dependable signal transmission matter.\u003c\/p\u003e\u003cp\u003eThose who should look elsewhere include users who need very heavy-duty abrasion resistance or extra-flexible stranded conductors for repeated movement; several customers described the jacket as somewhat fragile, so environments with rough handling during installation may benefit from a thicker-jacketed or stranded alternative.\u003c\/p\u003e\u003ch2\u003ePros \u0026amp; Cons\u003c\/h2\u003e\u003cp\u003e\u003cstrong\u003ePros\u003c\/strong\u003e\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eMade in the USA construction provides consistent manufacturing quality and traceability.\u003c\/li\u003e\n\u003cli\u003eSolid copper conductors deliver reliable conductivity and work well with smart thermostats and controls.\u003c\/li\u003e\n\u003cli\u003eCL2 ETL listing allows safe in-wall low-voltage use for HVAC and doorbell wiring.\u003c\/li\u003e\n\u003cli\u003eLifetime warranty adds long-term confidence for residential installations.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cstrong\u003eCons\u003c\/strong\u003e\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eSome users report the outer jacket can feel fragile during installation, so extra care is advisable.\u003c\/li\u003e\n\u003cli\u003eNot stranded, so it is less suited to applications requiring frequent flexing or movement.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eSpecifications\u003c\/h2\u003e\u003ctable\u003e\n\u003ctr\u003e\n\u003ctd\u003eConductor\u003c\/td\u003e\n\u003ctd\u003e100% solid copper\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eGauge \/ Conductors\u003c\/td\u003e\n\u003ctd\u003e18\/3\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eLength\u003c\/td\u003e\n\u003ctd\u003e100 ft\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eListing\u003c\/td\u003e\n\u003ctd\u003eCL2 ETL listed\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eApplications\u003c\/td\u003e\n\u003ctd\u003eThermostat, doorbell, HVAC heating control, low-voltage\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOrigin\u003c\/td\u003e\n\u003ctd\u003eMade in USA (New York)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWarranty\u003c\/td\u003e\n\u003ctd\u003eLifetime satisfaction warranty\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\u003ch2\u003eOur Verdict\u003c\/h2\u003e\u003cp\u003eThe 18\/3 100ft thermostat cable is a practical, value-minded choice for anyone wiring standard residential thermostats, doorbells, or HVAC control circuits who prefers solid copper and a US-made product. It excels for fixed in-wall runs and installations where conductivity and code-listed safety matter, though installers should handle the jacket carefully and avoid uses that require repeated flexing.\u003c\/p\u003e\u003ch2\u003eFrequently Asked Questions\u003c\/h2\u003e\u003cp\u003e\u003cstrong\u003eIs this cable safe for in-wall thermostat wiring?\u003c\/strong\u003e\u003cbr\u003eYes, it is CL2 ETL listed for low-voltage in-wall use, making it suitable for typical thermostat and doorbell runs.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWill it work with smart thermostats?\u003c\/strong\u003e\u003cbr\u003eYes, customers report good functionality with many smart thermostats thanks to the solid copper conductors and stable signal transmission.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs the jacket durable for rough installations?\u003c\/strong\u003e\u003cbr\u003eSome buyers found the jacket less robust than heavier-duty cables, so take care during pulling and avoid sharp edges to prevent damage.\u003c\/p\u003e","brand":"NATIONAL Wire\u0026Cable","offers":[{"title":"Default Title","offer_id":48628152336603,"sku":"B0CSPRM5CF","price":34.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0724\/1043\/1707\/files\/819ODocuELL._SL1500.jpg?v=1778440919","url":"https:\/\/gearmusthave.com\/products\/18-3-100ft-thermostat-wire-solid-copper-cl2-low-voltage","provider":"GearMustHave","version":"1.0","type":"link"}