What is the blue wire for on my thermostat?
What is the blue wire for on my thermostat? Blue wires are also called “C” wires because they are the Common wire. C wires are necessary for any “smart” thermostat that needs to be connected to a power source 24/7, regardless of your heat pump type. Blue wires are for heat pumps, like orange wires. This wire connects to terminal B on your thermostat. What thermostats work with 2 wires? 2 Wire Thermostat ModelsHoneywell TH1100DV1000 – 2 Wire Digital Thermostat. Honeywell TH1100DV. This model from Honeywell (TH1100DV) is the most popular 2 wire thermostat among all other models. Emerson 1E78-140...