I am replacing my old termostats with a HUNTER MODEL 44260 Programmable Thermostat. The wires on my old thermostats are not labeled. Both my thermostats have 1 white wire, 1 yellow wire, 1 blue wire and 1 wire that is slightly off-white. Can anyone help me? I don't know which wire is which. The new thermostat requires I label the wires, RH; RC; Y; W; and G. I think the White is W; and the blue is Y?