How to Quiet an Outside Air Conditioning Unit

Air conditioners, especially the pad-mounted type found outside homes, move a lot of air. They can be noisy, and that sound can travel indoors or bother the neighbors. Quieting an outside air-conditioning unit requires soundproofing and cleaning the unit. Even new outside units can be noisy, so replacing the unit might not solve the issue. The fan blades and the compressor all make noise, so a large barrier must be made to silence the unit.

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Paneled fencing will help muffle air conditioner noise.

Step 1

Clean the air conditioner fan blades, as they can cause noise. If the noise problem isn't solved, clean the rest of the unit. Consider replacing the compressor if it's old and noisy. If the unit isn't quiet enough, continue on and build a soundproof barrier.

Step 2

Cut the fence posts and fence panels to a height about 6 inches taller than the air conditioning unit.

Step 3

Determine locations where the fence posts will be installed. The privacy fence will surround the unit on three sides and will be installed just a few inches outside of the air conditioner. Each side will be just a few inches longer than the unit. Mark the spot for the fence posts at each corner.

Step 4

Dig the fence post holes. Install the fence posts by hammering them into the ground and filling the holes with dirt. Attach all the fence panels using screws. Paint or stain the fence.

Step 5

Cut sheets of sound-absorbent cell foam to fit the inside of your fence-style sound barrier. Glue the cell foam from the top to the bottom of the fence, using foam glue.