My current thermostat has the wiring in the attached picture. Currently there is one (1) green wire in G, one (1) yellow wire in Y, one (1) orange and one (1) light green wires in W (two total in W), one (1) red wire in RC, and one (1) dark green wire in R. The existing wiring can be seen in the attached photo. The lettering on the inside that is covered by the wiring reads C, G, Y, W, RC, R for the conventional system.
I live in an older house with a converted HVAC system for central air conditioning (forced air). There is a blower unit in the attic. I believe there are coils in the blower that are cooled by the outdoor AC unit or heated by the furnace in the basement. The blower then sends the cooled or heated air to the ducts.
I believe I would connect the Nest Learning Thermostat as follows: G-G, Y-Y1, RC-RC, R-RH. I am lost on what to do for the double wires in W. I have tried to locate where the orange and light green wires go to, but have been unsuccessful.
