My 16” Intel MB pro would not agree. Loud fans kick up the moment you plug in a screen
My old Intel MBP would sound like a jet engine just by opening Chrome.
This one… I hammer it all day with multiple servers running, JS projects, tons of tabs, Docker containers, many misc. software utilities… not a single noise.
I’ve only heard the fans once while using Handbrake.
Plugging in an external screen enables the discrete GPU so your energy usage and temperature will go up.
I don't see a real difference though. Mine doesn't overheat but the fan kicks in often anyway.