Yeah, I learned my lesson after my 722 died 2-3 years ago. Ever since, I just put a electric fan to the right of the DVR. It may not look aesthetically pleasing, but it keeps my HWS cool, even during the very hot summer days, and even when the AC is off.
Same with the Joey. I have a USB fan next to it.
Same with the Joey. I have a USB fan next to it.