I'm slowly in the process of installing a fixed ac unit. Something like this:

Presently I am just using a big old window unit. 12000 btu if memory serves. They are quite cheap and don't cost much to maintain ( actually I have never spent a cent on one) but it is pretty heavy and noisy and I certainly foresee a time when I won't be able to muscle it into place (it is in a window at the top of a staircase :o). I think I know the pros of the pictured units. What are the cons?

Presently I am just using a big old window unit. 12000 btu if memory serves. They are quite cheap and don't cost much to maintain ( actually I have never spent a cent on one) but it is pretty heavy and noisy and I certainly foresee a time when I won't be able to muscle it into place (it is in a window at the top of a staircase :o). I think I know the pros of the pictured units. What are the cons?
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