Air conditioners are an incredible invention that are vital to staying cool and comfortable come summertime. But like any machine, they can break down and create some very odd sounds, such as a pulsating noise. The main thing to do when this happens is to contact a technician to come investigate the cause.
A noise could be the beginning of a larger problem and ignoring it can cause more headaches and issues down the road. Keeping your AC in great working order will save you money on costly repairs, as well as reduce the need to install a new unit.
Here are some of the noises to keep an ear out for to identify when it’s time to call in the experts.
Normal Air Conditioner Noises
Your air conditioner will make noises that are simply part of its every day functioning. When it turns on and off, a clicking noise can be heard. That’s the sound of all the moving parts jumping in and out of motion. Blowing noises are also normal as air circulates throughout your home.
These noises should remain at the same volume if all is well with your air conditioning unit. If these noises start to get louder, they could be a warning sign of trouble down the road.
Air Conditioner Noises That Can Be Problematic
All of the following sounds from your air conditioner are bigger signs that something needs to be addressed sooner than later.
- Squealing or screeching. This is cause for concern, as it is most likely a sign of a faulty or damaged belt or bearings. This should be repaired before turning your AC back on.
- Humming or whistling. A central air conditioner humming noise may be a loose or damaged seal somewhere in your unit. It may also sound like a whistle. It’s a relatively quick fix for a professional.
- Pulsating. If your air conditioning is making a pulsating noise, this is generally an indication of a problem with your unit’s compressor. The coil inside of it may be dirty or broken. Have it looked at before running the unit.
- Buzzing. A central air conditioner compressor buzzing noise could be a sign of an electrical issue with your AC. This noise may also be related to a loose part or malfunctioning compressor. Whatever the issue, it should be inspected by a professional before operating. 
 Noises Your AC Makes and What They Could Mean. American Home Shield. Available online https://www.ahs.com/home-matters/repair-maintenance/what-ac-noises-mean/.