As an air conditioning unit ages it can start to make rattling or buzzing sounds that can be distracting.
While calling a HVAC technician is always recommend there are some things that can be done by the DIYer to see if the problem goes away.
The first thing is to simple go around the unit and tighten up all the external screws.
Screws can become loose over time and will let parts rattle about when they do.
A handheld tool or cordless drill can be used simply be sure not to over tighten them.
Tightening them hand tight is good so they simply dont rattle about or let other components do the same.
Another thing that can be done is to be sure the unit is level and doesn’t wobble about on its stand.
All A/C units will sit on some type of foundation from a hard plastic pad to cement.
Sometimes the units are not set right or have moved over time for one reason or another.
The unit should not wobble if pushed on and should be solid set to the ground.
If it is not than a object can be pushed under the bottom of the unit to help keep it steady.
There are vibration pads that can be bought that can be placed under any low or high spot as needed.
The above are some of the simple things to check for if a A/C unit is making a rattling sound.
More extensive work can be done to quiet down a unit including a air compressor cover and compressor vibration isolation mounts.
The two fan motors can also be a source of noise if the cages are not tightened properly, the blades have become unbalanced, or the motors have simple gone bad.
The more extensive problems require more skill and is usually done by a certified HVAC technician.
Every unit will have aged differently and will often have a unique solution to solving a noise problem.
While simple things often work sometimes calling a experienced heating and cooling technician is the only option.
Have you had experience quieting a noisy air conditioning unit? Let us know how you solved it in the comments below.