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Thank you. Does it make a difference if it's the Nest thermostat E? Nest says it doesn't need a C wire, but from the problems I've seen researching this, it sounds like I should have one? Just making sure there's no issue with the Nest, and with plugging in the C wire to my AC.

Hello. I am looking to install a new smart thermostat which will need a C wire. (First photo) When I took the old thermostat off the wall i found only 4 wires plugged in, there was a slot labeled C but there were no wires plugged in it. There was a separate wire alone not plugged in to any of...