Bummed, barely used AC already Not Performing.

We rented a class A this summer and the AC died. Fan blew air but couldn't hear the compressor kick on. It was only a year old. First guy that looked at it said the Freon was low and they are a sealed unit. That means non serviceable. Had to be replaced. This guy didn't have one available but another place had one in stock. He told us the same thing. Non servivceable, had to be replaced. The guy who replaced the unit said he is seeing more and more of these dying at an early age.
Mike