Do yourself a favor go out to a big box store and get a.
Air conditioner return vent whistling.
The installer was notified and his employees attempted to correct the problem by installing an additional smaller return duct in my office which is located near the larger return.
Why low airflow causes whistling.
Check the filter and change it if it looks like the one on the right in this picture.
We ll go over these problems in more detail and discuss what you can do to fix them.
Dirty air filter a dirty filter acts like a barrier to return air forcing the blower to work harder and longer to circulate air say hello to a larger electric bill.
Increasing the size or quantity of the vents is an option but again not an easy one.
It will increase the air flow in those rooms and should reduce the pressure enough in the problem room to stop the whistling.
You have two kinds of vents in your home.
Troubleshooting tips for a whistling air conditioner.
This reduced but did not eliminate the noise which gets louder if the.
Or your phone if it vibrates on the counter.
But first let s look at how low airflow causes your air conditioning system to produce that whistling sound.
Too many closed doors.
As a result your system s blower is essentially starved for air usually as a result of some type of blockage.
The fins are angled to hide those ugly filters we put there to keep our coil and air clean.
You re worried that you might not hear the doorbell if it rings.
Another sign of poor ductwork and a culprit of noise coming from your air return vents is unlined return ducts.
Now you can barely hear your music.
Fiberglass duct liner absorbs noise like a charm and i always make sure to install it especially in return.
I recently had an air conditioning system installed in a house i m building and have a problem with a whistling noise in the return duct.
Finally one solution that i used in a similar situation remove the vent completely in other rooms.
This blockage produces higher pressure and air velocity inside of the vent which in turn produces a whistling sound.
Blocked return vent the return vent may be blocked due to dust or other debris.
An a c blower pulling in air from.
Air filters pick up unwanted contaminants in your home s air but when they are dirty they restrict the airflow process.
Everything was fine until the air conditioner came on.
The air conditioner roars to life.
If so you could be experiencing low return flow which means that your return air vent is not getting enough air.
The easiest step to take is to replace your current air filter.
If you have one of the return air grilles pictured below in your ceiling or wall listen up.
You ll have to turn up the volume.
Change your air filter.
