I just got a new thermostat and am trying to hook it up. The old traditional dial type thermostat when unhooked has only two wires a black and a white coming out of the wall. The new thermostat has places for 5 wires to connect. Y, G on the left side and Rh, Rc, and W on the right side. How do I hook this up?

Read the instructions. They should tell you to use RH and W.