Recommended
Raspberry Pi 4 Cooling
Why people recommend it
ExplainingComputers video often cited when asking if a Pi 4 needs cooling, comparing thermal results from the stock setup through to fans and custom options.
Watch for: comparisons date from the Pi 4's 2019 launch year
In their words
I've watched some videos by ExplainingComputers about cooling RPi 4: [video] and now I'm thinking that official case is very bad.
Ivan Koshelev on raspberrypi.stackexchange.com, Jun 2020. CC BY-SA.