I've only been using for about 5 weeks but haven't noticed significant heat at all.
The general tips I give for this are to make sure that your mount is not enclosed (box mounts are terrible for heat) and to ensure that its mounted a few inches from the ceiling.
If mounted against a drop ceiling in a basement, perhaps installing a fan in an adjacent panel to pull warm air away, or to blow in fresh cool air would help.
Also be sure that you're not blocking any of the vents in a mounted scenario - These puppy's gotta breathe!