I have new RPi 3B+ intended to run 24/7. I am looking to ensure it doesn't overheat, so am wondering whether having wired ethernet would make it run cooler than using the WiFi? The Pi is situated next to the router, so could be hard-wired (I just haven't bothered obtaining a cable)
And would having an HDMI cable connected cause it to run warmer than without the cable connected? At this stage I'm running it headless, but depending on what else I do with it I may look at using the HDMI output as well.
I don't foresee any operations that should make it heat up though, just wanting to look after it