Have a large ducted reverse cycle (~16kw) unit done the side of the house and looking at ways to reduce the noise it makes. Where it is located, there is only ~1.5m between the house and boundary wall (both are brick) and the ground is paved. Being all hard surfaces the noise seems to reflect down to the backyard. Was thinking of putting some bamboo screening (more the thin,1cm bamboo) along the brick boundary wall to help absorb the sound and putting in a solid timber gate to reduce the amount of sound that travels to the back yard. Will this work? Any other suggestions?