Low Voltage Thermostat

I really do not know who they are. Accuracy is more dependent on the quality of parts used, the design and calibration of the device.

I assume you're talking about a stat for heatinga Nowadays the low voltage electronics tend to be fairly accurate and simply because its very simple technology so they can make good and cheap. Stat a high voltage is usually still a mechanical device and because of how cheap and popular the electronics are just not there much demand for high quality mechanical Moreover, while they tend to be low quality crap. You can usually by the parties to use a stat in a low voltage system of high voltage. It may even cost about the same, its just a little more complicated to implement.