When I leave for a few hours, I put my dogs in a room, turn on the television, and close the door. I always tune to either a classic rock music or a classical music channel at a moderately low volume (since dogs can apparently hear quite well). The music channels have mildly moving pictures to prevent TV burn-in, but nothing that would entertain the dogs visually. I have recently heard about Dog TV and read that dogs cannot properly visualize regular TV signals anyway, so what I'm doing seems fine.
I also give the dogs a small treat before I leave; one of them gets it directly and the other via a wood puzzle to distract her.
Is this a generally effective method to provide some amount of comfort when I'm away from the home, or should I be doing something else?