How Do I Make An Existing AC Unit Quieter? - Page 2 - HVAC - Contractor Talk

How Do I Make An Existing AC Unit Quieter?

 
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Old 09-26-2018, 07:46 AM   #21
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Re: How Do I Make An Existing AC Unit Quieter?


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Originally Posted by beenthere View Post
The loud noise, is a sign of an under sized duct system, or incorrect register/grille selection by installer.
This is what my HVAC guy stresses all the time. You can't even tell my heat or AC is on. I feel like that's the way it should be.
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Old 09-26-2018, 02:42 PM   #22
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Re: How Do I Make An Existing AC Unit Quieter?


What size unit is it? Air handler will run 400cfm per ton. How many and what sizes are your return air grills? I can hear mine running but its not bad, I have a 4 ton and have a 24x30 in the ceiling by the thermostat and a 12x12 in my bedroom with plans to add another on the other side of the house.
I have my first 2 stage system with a variable speed air handler in my new house and absolutely love it. When it runs on 1st stage only you can't even tell its on.

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Old 09-26-2018, 02:49 PM   #23
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Re: How Do I Make An Existing AC Unit Quieter?


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What size unit is it? Air handler will run 400cfm per ton. How many and what sizes are your return air grills? I can hear mine running but its not bad, I have a 4 ton and have a 24x30 in the ceiling by the thermostat and a 12x12 in my bedroom with plans to add another on the other side of the house.
I have my first 2 stage system with a variable speed air handler in my new house and absolutely love it. When it runs on 1st stage only you can't even tell its on.


That's funny you mentioned that I'm in the process of adding a 16x24 as we speak.


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Old 09-26-2018, 04:09 PM   #24
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Re: How Do I Make An Existing AC Unit Quieter?


Hey gentlemen meet me over in the things I hate thread.


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Old 09-26-2018, 04:13 PM   #25
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Re: How Do I Make An Existing AC Unit Quieter?


Might make it worse if the ducting can't handle the extra velocity/CFMs. Think I read the main trunk should be around 600-700 fpm
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Old 09-26-2018, 06:59 PM   #26
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Re: How Do I Make An Existing AC Unit Quieter?


I thought oversized units short cycle and the right size unit can become oversized if you upgrade other house RValues.

So insulated duct line is no longer an option, how about a canvas transition off the truck to absorb echo vibration?
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Old 09-26-2018, 07:06 PM   #27
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Re: How Do I Make An Existing AC Unit Quieter?


Replace it all with true variable speed you'll love it.
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Old 10-01-2018, 11:37 AM   #28
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Re: How Do I Make An Existing AC Unit Quieter?


Use the wall cavity as an duct, add return vent above existing ones =slower air flow = quieter.

Build a Air filter box(6"x24"? floor to ceiling) on the room side of existing grillage to create a labyrinth sound reduction. install sound dampener material on at least two sides of cavity.

Consult HVAC guide to duct sizing to see where you went off the Reservation with air speed...

Add floor return duct under the furnace box that communicates with poorly served rooms...

How long does the system run during max cooling ~2:00 pm mid summer?, If less then 50 % of the time, you could swap the oversized A coil and outdoor condenser for smaller unit that needs less CFMs.

Are any rubber motor or fan mounts missing or damaged?

Do you have a isolating plenum connector, so the entire ductwork isn't a giant speaker cone for furnace vibs....

Is the Fan DIRTY/ out of balance? Loose belt, dying bearing?

A kink in the refrigerant lines creating a nasty harmonic/whistle noise?

Buy a larger stereo?
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Old 11-11-2018, 03:17 PM   #29
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Re: How Do I Make An Existing AC Unit Quieter?


From the picture that I see, it looks as if you are drawing all the air from the hallway,and the side. It doesn't help that the furnace is in the middle of everything, inside of the living space.
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Old 11-11-2018, 06:28 PM   #30
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Re: How Do I Make An Existing AC Unit Quieter?


Installation manual: https://aplusair.ca/wp-content/uploa...ion-Manual.pdf

Check out the "door" for attic mounting is not in position...

Lower fan speed one or two steps.
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Old 11-11-2018, 10:42 PM   #31
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Re: How Do I Make An Existing AC Unit Quieter?


Quote:
Originally Posted by Fouthgeneration View Post
Use the wall cavity as an duct, add return vent above existing ones =slower air flow = quieter.

Build a Air filter box(6"x24"? floor to ceiling) on the room side of existing grillage to create a labyrinth sound reduction. install sound dampener material on at least two sides of cavity.

Consult HVAC guide to duct sizing to see where you went off the Reservation with air speed...

Add floor return duct under the furnace box that communicates with poorly served rooms...

How long does the system run during max cooling ~2:00 pm mid summer?, If less then 50 % of the time, you could swap the oversized A coil and outdoor condenser for smaller unit that needs less CFMs.

Are any rubber motor or fan mounts missing or damaged?

Do you have a isolating plenum connector, so the entire ductwork isn't a giant speaker cone for furnace vibs....

Is the Fan DIRTY/ out of balance? Loose belt, dying bearing?

A kink in the refrigerant lines creating a nasty harmonic/whistle noise?

Buy a larger stereo?


It's drawing from the hall, kitchen and formal dining room on the other side.


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Old 11-11-2018, 10:43 PM   #32
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Re: How Do I Make An Existing AC Unit Quieter?


I can completely remove the return grills and it's still very loud. The registers are not that bad.


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Old 11-11-2018, 11:07 PM   #33
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Re: How Do I Make An Existing AC Unit Quieter?


I've had some pretty noisy blowers from time to time. I've also picked up whistles and other noises from air bypassing the air filter.

I'm assuming you're using a high efficiency filter, so there will be a pretty large pressure droo across it.

You may be able to do some sound deadening in there without restricting flow too much.
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Old 11-11-2018, 11:22 PM   #34
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Re: How Do I Make An Existing AC Unit Quieter?


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I've had some pretty noisy blowers from time to time. I've also picked up whistles and other noises from air bypassing the air filter.



I'm assuming you're using a high efficiency filter, so there will be a pretty large pressure droo across it.



You may be able to do some sound deadening in there without restricting flow too much.


I took the filter out to see if that's the issue. Didn't get quieter.


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Old 11-11-2018, 11:34 PM   #35
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Re: How Do I Make An Existing AC Unit Quieter?


Winter makes my AC much quieter.
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Old 11-12-2018, 12:30 AM   #36
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Re: How Do I Make An Existing AC Unit Quieter?


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Winter makes my AC much quieter.
Me Too!
Thanks Leo, I needed a good laugh.
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Old 11-12-2018, 04:25 AM   #37
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Re: How Do I Make An Existing AC Unit Quieter?


Making and post a recording of the sound/noise so we can here what it is.
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Old 11-12-2018, 07:58 AM   #38
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Re: How Do I Make An Existing AC Unit Quieter?


I was told by a tech that the inducers are noisy. Some worse than others.
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Old 11-12-2018, 08:05 AM   #39
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Re: How Do I Make An Existing AC Unit Quieter?


Some units are just loud. In my first house I had a brand new Payne and it was LOUD. You had to pretty much yell over it while you were in the basement to communicate. Heat and ac.
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Old 11-12-2018, 08:38 AM   #40
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Re: How Do I Make An Existing AC Unit Quieter?


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Some units are just loud. In my first house I had a brand new Payne and it was LOUD. You had to pretty much yell over it while you were in the basement to communicate. Heat and ac.
One of the big selling points for the higher end units is often how many dB they produce.

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