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

How Do I Make An Existing AC Unit Quieter?

 
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Old 09-25-2018, 10:48 AM   #1
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How Do I Make An Existing AC Unit Quieter?


Here's my AC unit. Sounds like a jet taking off. I'm wondering if there's a thermostat to turn down the fan speed. Thanks guys go easy on me I'm just a carpenter.









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Last edited by Calidecks; 09-25-2018 at 10:54 AM.
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Old 09-25-2018, 10:55 AM   #2
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Re: How Do I Make An Existing AC Unit Quieter?


Sits right behind my TV.


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Old 09-25-2018, 03:38 PM   #3
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Re: How Do I Make An Existing AC Unit Quieter?


. . .turn it off . . .
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Old 09-25-2018, 04:30 PM   #4
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Re: How Do I Make An Existing AC Unit Quieter?


Unplug it, don't need it here until next May.
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Old 09-25-2018, 04:58 PM   #5
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Re: How Do I Make An Existing AC Unit Quieter?


I know some blower motors can be wired for lower speeds but if the internal motor wiring isn't proper, they will burn out quicker.

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Old 09-25-2018, 06:44 PM   #6
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Re: How Do I Make An Existing AC Unit Quieter?


Strictly speaking, what you are showing is the FAU and not what most consider to be the A/C unit. That is usually the condensing unit located outside.

The FAU is gas fired so you need combustion air of course, so I might recommend taking combustion air via a 7" tube from the attic area then you can insulate the door and that might mitigate a lot of the sound from the squirrel cage.

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Old 09-25-2018, 06:47 PM   #7
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Re: How Do I Make An Existing AC Unit Quieter?


you sure the unit/fan is functioning as designed?
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Old 09-25-2018, 07:11 PM   #8
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Re: How Do I Make An Existing AC Unit Quieter?


Googled it up : http://new.ncshvac.com/?product=59sc5a080s17-16

Describes fan speed option but with special thermostat.

Some hacks:
- not enough vent space below the unit. May have to add low in the hall. Would reduce the whooshing sound
- if the blower is that loud, could drop some sound absorption material on the floor in the vent duct. But, would chaise potentially bad blower or repair first.
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Old 09-25-2018, 08:20 PM   #9
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Re: How Do I Make An Existing AC Unit Quieter?


Quote:
Originally Posted by sefiroxx View Post
Googled it up : http://new.ncshvac.com/?product=59sc5a080s17-16

Describes fan speed option but with special thermostat.

Some hacks:
- not enough vent space below the unit. May have to add low in the hall. Would reduce the whooshing sound
- if the blower is that loud, could drop some sound absorption material on the floor in the vent duct. But, would chaise potentially bad blower or repair first.
Fan speed option is for continuous fan only. heating and cooling speed are fixed. But can be adjusted to a lower setting.

The loud noise, is a sign of an under sized duct system, or incorrect register/grille selection by installer.
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Old 09-25-2018, 08:28 PM   #10
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Re: How Do I Make An Existing AC Unit Quieter?


I'm with Mike on this inquiry. We've got a newly installed air handler that is doing similar....seems too damned loud due to the intake at the main return.
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Old 09-25-2018, 08:41 PM   #11
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Re: How Do I Make An Existing AC Unit Quieter?


You say it sounds like a jet. Is it the sound of the motor or the sound of the rushing air?
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Old 09-25-2018, 09:48 PM   #12
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Re: How Do I Make An Existing AC Unit Quieter?


Quote:
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You say it sounds like a jet. Is it the sound of the motor or the sound of the rushing air?

Air, i'll wager
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Old 09-25-2018, 10:09 PM   #13
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Re: How Do I Make An Existing AC Unit Quieter?


Sorry guys, just got in from a long day today.

Yes, it's air. There's three return air vents. The sound of air pulling from the vents, and I've completely taken the grill off. It's still louder than ****.


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Old 09-25-2018, 10:11 PM   #14
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Re: How Do I Make An Existing AC Unit Quieter?


Quote:
Originally Posted by griz View Post
you sure the unit/fan is functioning as designed?


The unit is only about 3 years old. Or home gets cooled down quickly, no doubt.


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Old 09-25-2018, 10:12 PM   #15
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Re: How Do I Make An Existing AC Unit Quieter?


No blockage? Has it always been this way? If yes to both it sounds like the CFM being pulled is to large for the openings.
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Old 09-25-2018, 10:12 PM   #16
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Re: How Do I Make An Existing AC Unit Quieter?


Quote:
Originally Posted by beenthere View Post
Fan speed option is for continuous fan only. heating and cooling speed are fixed. But can be adjusted to a lower setting.



The loud noise, is a sign of an under sized duct system, or incorrect register/grille selection by installer.


To clarify, the registers in the rooms are quiet. It's just the return air under the FAU.


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Old 09-25-2018, 10:13 PM   #17
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Re: How Do I Make An Existing AC Unit Quieter?


Quote:
Originally Posted by Leo G View Post
No blockage? Has it always been this way? If yes to both it sounds like the CFM being pulled is to large for the openings.


No blockage, and yes it's always been this way.


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Old 09-25-2018, 10:17 PM   #18
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Re: How Do I Make An Existing AC Unit Quieter?


Well do some science. Measure the total output area by adding up the square footage of the registers. Then do the same for the returns. They should be the same or the returns should be bigger.
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Old 09-25-2018, 10:34 PM   #19
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Re: How Do I Make An Existing AC Unit Quieter?


Do you have a 4 ton AC unit (48000 BTU)? Because at full speed (1600 CFM) that's what it's rated for. That's a pretty big AC unit. Usually a house is 2.5 ton.

That's what I run in the shop.
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Old 09-25-2018, 10:47 PM   #20
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Re: How Do I Make An Existing AC Unit Quieter?


I want to say it's a 5 ton. I'll look tomorrow.


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