What can we do about our noisy Air Conditioner? Can we build a shelter over it?

We have an AC unit on our balcony on the 2nd floor. This was just put there last July (11 months ago). The people before us had this old water cooled AC system which was apparently never meant to be used in individual homes. The upstairs neighbour has his bedroom right above the AC unit, and there's no... show more We have an AC unit on our balcony on the 2nd floor. This was just put there last July (11 months ago). The people before us had this old water cooled AC system which was apparently never meant to be used in individual homes.
The upstairs neighbour has his bedroom right above the AC unit, and there's no 3rd floor balcony there. He can't sleep due to the noise. The downstairs neighbour doesn't want us to move our AC down to grass level. So can we build a shelter over our AC unit and who would we get to do that sort of thing? (It's probably against condo rules, but I'd like to look into various possibilities).
Update: Bobbie, yes a centralized system would be wonderful. The building is 3 storeys high and has 8 units. However, the condo agreement is between 4 units. The other half has a separate agreement. I bet they could save a lot of money if the 8 units worked together. It was set up 27 years ago.
Update 2: Bobbie, yes a centralized system would be wonderful. The building is 3 storeys high and has 8 units. However, the condo agreement is between 4 units. The other half has a separate agreement. I bet they could save a lot of money if the 8 units worked together. It was set up 27 years ago.
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