Google Nest Community

I think my question was answered. I can buy a Nest thermostat (minus the 2020 version) and not need a C wire. Not sure if my system has one even though the wiring doesn't show one.Thanks,Chris

I think I did this right. Also, the compatibility checker gives an ambiguous answer. Too expensive a product to go with a maybe.Wiring

Get an answer on this? I'm looking to replace the same model with a similar Nest thermostat.