WOW, that is great the Hopper 3s run cooler. I hope that there new DPH42 switch comes out sooner than the end of the year. Are you retailers hearing anything about it at all? I can't wait to update to Hopper 3s and 4k Joeys.I don't know of a way other than to put your hand on top of the receiver and see if it's hot.
I don't worry about that because I've got a fan on the Hoppers. IIRC you do too.
Often the Hopper 3's are running so cool that the internal fans aren't even running.