20/4 Thermostat Wire — 20 Gauge Solid Copper CMR HVAC/AC Cable, 500FT Roll, White

20/4 construction with 20-gauge solid copper conductors delivers consistent, low-voltage signal transmission for thermostats and control circuits. Supplied on a 500FT roll to handle long cable runs without splices. CMR-rated for compliance with commercial and residential installation requirements. Designed for a wide range of HVAC and heating uses including heat pumps, water heaters, air conditioners, electric baseboard heating and solar panel systems. Provides reliable thermostat connectivity for accurate temperature control and also supports door bell applications.