Ray wrote:
We live in an L-shaped, five-room apartment with 1600 square feet.
(Exluding hall, kitchen, and 2 baths.)

For several years we have used a 23,000 BTU window air conditioning
unit which cools the entire apartment adequately for our needs.

The only problem is, it makes a lot more noise than we like.

Would it be possible to place the entire unit on the outside,
probably on a platform just below the window, and rig up some
customized ducts to handle the intake and outflow to carry the air
into the apartment? This would involve some sheet-metal fabrication,
of course, and I'm sure we would still hear some noise, but
diminished. But the cost would be a great deal less than central air.

Any ideas welcome.

Ear plugs. Fifty cents.