Finally one solution that i used in a similar situation remove the vent completely in other rooms.
Air conditioner return vent whistling.
Check the filter and change it if it looks like the one on the right in this picture.
The air conditioner roars to life.
Another sign of poor ductwork and a culprit of noise coming from your air return vents is unlined return ducts.
Why low airflow causes whistling.
This reduced but did not eliminate the noise which gets louder if the.
The easiest step to take is to replace your current air filter.
But first let s look at how low airflow causes your air conditioning system to produce that whistling sound.
Troubleshooting tips for a whistling air conditioner.
You ll have to turn up the volume.
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.
Now you can barely hear your music.
This blockage produces higher pressure and air velocity inside of the vent which in turn produces a whistling sound.
We ll go over these problems in more detail and discuss what you can do to fix them.
If you have one of the return air grilles pictured below in your ceiling or wall listen up.
Increasing the size or quantity of the vents is an option but again not an easy one.
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.
You have two kinds of vents in your home.
It will increase the air flow in those rooms and should reduce the pressure enough in the problem room to stop the whistling.
You re worried that you might not hear the doorbell if it rings.
Too many closed doors.
Everything was fine until the air conditioner came on.
Do yourself a favor go out to a big box store and get a.
Or your phone if it vibrates on the counter.
As a result your system s blower is essentially starved for air usually as a result of some type of blockage.
An a c blower pulling in air from.
When this is the case too much air is being forced into a confined space which can cause whooshing or whistling sounds.
Fiberglass duct liner absorbs noise like a charm and i always make sure to install it especially in return.
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.
Change your air filter.
The fins are angled to hide those ugly filters we put there to keep our coil and air clean.
If so you could be experiencing low return flow which means that your return air vent is not getting enough air.
Blocked return vent the return vent may be blocked due to dust or other debris.
