I have a Pi3 without a PiHat and in a small plastic case running Allstar at our air conditioned repeater site and the new Pi4 running the SHARI PiHat at my home QTH. They are linked together, so the activity of each is similar.? I would expect the one with the Hat to be warmer.?

Supermon says the CPU temp of the Pi3 is 111F. The Pi4 is 114F.? I bet that case is doing wonders.?

I may stick a fan on it one day too see what it does, but i think it's doing fine.?

Dan

W4DTO