I have noticed over the last few months, after having mounted our TV in our new condo, that many are hanging their TV too high. I can see how this is easily done, because the things we normally hang on the wall are artwork. Normally, artwork is hung at eye-level when standing up. A TV however, is not meant to be viewed standing up. A TV should be mounted much lower than artwork, because it is viewed while sitting down.
If you think about TV consoles, they are usually much lower than say, a kitchen table. They are low to the ground, because the television should be lower to the ground. Here are some examples of mounted television heights. (I don’t have a standard for measuring televisions, but sit on your couch and guage what a comfortable height is for your TV.)
This one is too low.
This one is too high.
And this one is just right.