I was noticing on Amazon.com that the portable air conditioners (that can be
wheeled from room to room) have gone down in price. Consumer Reports
reviewed them years ago and said they weren't energy efficient. The new
units my Danby, Mobile Air and others are combo a/c, humidifiers, and
heaters.

Anyone have experience recently and are there any recommendations.
My apartment has the under window sleeve for air conditioners and I do have
two, but one is as old as the hills and fails to work most of the time.
A replacement would involve getting someone in to install it, and re-plaster
the wall around the sleeve. I could also use the portable heater in the
portable unit.