Home thermostat wiring voltage electrical-onlineImage: electrical-onlineLine Voltage: (Uses direct voltage) A line voltagesystem uses direct current instead of only 24 volts like the typical thermostatof today's newer homes. This type of thermostatis used in older homesthat use direct voltage. The power wiresare thicker and they generally run either 120 or 240 volts on direct current. 3 Steps to Choosing the Right Thermostat - Air & Water, Inc. Is this answer helpful?Thanks!Give more feedbackThanks!How can it be improved?How can the answer be improved?Tell us how Thermostat Wiring Explained - electrical-online In this article, I am going to explain the function and wiring of the most common home climate control thermostats. This information is designed to help you understand the function of the thermostat to assist you when installing a new one, or replacing or up-grading an old one.Wiring a Light Switch · Electrical Online Thermostat Wire - Low Voltage - Wire - Electrical - The wwwdepot›Electrical›WireShop our selection of Low Voltage, Thermostat Wire, Wire in the Electrical Department at The Home Depot.