Lou wrote:
I have come across a strange problem. I have a house that has an
entertainment center that operates on a remote. It's been there for
years and works great.
Two months ago I had a new wall unit a/c installed with a remote
control. Now when
the a/c automatically turns on, the entertainment system goes on and
off. We have always had a wall unit with no problems. The electric
checks out, so theres no problem that anyone can find. The only thing
someone suggested is that the remote sensors talk to each other.

No, that is baloney. The sensors are sensors, not emitters. They do
not produce any signals.

The emitter is on the handheld remote unit. Yours has a thermostat
function built into the remote. The remote is telling the AC to come
on, and that signal happens to be the same signal that tells your
entertainment system to come on.