Thermostat wire typically comes in which two standard gauges?

Thermostat wire commonly uses 18 and 16 AWG gauges, which are suitable for low-voltage applications in heating and cooling systems, including gas furnaces. These wire gauges provide a balance between flexibility and current-carrying capacity, which is essential when connecting the thermostat to the furnace or other HVAC components.

The 18 AWG wire is typically used for most thermostat installations, handling the low current required to send signals between the thermostat and the furnace. The 16 AWG wire, while slightly thicker, is sometimes used for longer wire runs or specific applications that require a bit more durability or reduced voltage drop. This makes the 16 and 18 AWG gauges the standard choices for thermostat wiring, ensuring reliable performance and ease of installation in residential and commercial settings.