A plant or two in a row around an air-conditioning unit will do very little if anything to reduce the noise level. However you can use plants to screen a view just keep from putting them too close to the air-conditioner unit in order to not block its ability to take in air and cool off the coils. Small compact evergreen shrubs would be a good choice for such a planting. You might also want to consider putting in some type of a lattice panel around the unit. The lattice would provide a visual screen or you could also plant of vine on the lattice.
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