Do I connect old, unmarked thermostat wires to new thermostat?
Hi folks, I have an old mercury Honeywell thermostat with two unmarked wires sticking out of the wall. They almost look like thin audio cables, with one lighter than the other. I was planning on replacing it with a new Thermostat for the forced hot air gas furnace (which is probably about 10-20 years old now). Would it damage either unit if I connect the wrong wires (i.e. switched) to the W and RH connectors on the new thermostat? Sorry if this sounds stupid. I'm obviously a noob.