![Is your wiring compatible with a smart thermostat? Our guide to low voltage, line voltage, and more – Smart Thermostat Guide Is your wiring compatible with a smart thermostat? Our guide to low voltage, line voltage, and more – Smart Thermostat Guide](https://smartthermostatguide.com/wp-content/uploads/2016/02/thermostat_wires_no_c_wire.jpg)
Is your wiring compatible with a smart thermostat? Our guide to low voltage, line voltage, and more – Smart Thermostat Guide
![Do I have a high voltage system? The black and white wires are thicker. I couldn't find any other indication that it is high voltage. Just trying to add a smart thermostat. : Do I have a high voltage system? The black and white wires are thicker. I couldn't find any other indication that it is high voltage. Just trying to add a smart thermostat. :](https://preview.redd.it/do-i-have-a-high-voltage-system-the-black-and-white-wires-v0-ab78rdsfeb9a1.jpg?width=640&crop=smart&auto=webp&s=23cf8996ccb0a93b525c5e490bacdca0b7677f64)
Do I have a high voltage system? The black and white wires are thicker. I couldn't find any other indication that it is high voltage. Just trying to add a smart thermostat. :
![electrical - Smart thermostat (high voltage) makes heater constantly on - Home Improvement Stack Exchange electrical - Smart thermostat (high voltage) makes heater constantly on - Home Improvement Stack Exchange](https://i.stack.imgur.com/vemtm.jpg)