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Shanon,
First, turn off the furnace before working with the themostat. You can blow a transformer or a board on some models. You will need at least 3 strand wire, but if you have to run new, get at least 5 strand for later needs. You will need at the stat - R to red, G to Green and W to White. You should find the same connections at the furnace. The way it works, is that the power comes from the furnace transformer on the red. The thermostat energizes the white on a call for heat and the green for the manual operation of the blower. Remember that running the fan is somewhat expensive on a regular furnace, so turn it off when you do not need it.
Larry
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