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Old 11-30-2009, 12:10 AM   #1
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Quiet HVAC systems?


Hey all,

First post on this site and I can say I love looking at people progress through their projects... makes me want to get out and start working on mine!

Anyways, the reason I came in here. Right now I own a modular home, and while I love it, I am not a fan of the heating unit that came with the household. Since it is such an open floor design, when the furnace kicks in, you need to turn up the sound system to annoying levels, or need to start talking louder in order to hear people. The system is loud. Anyways, I am wondering if there is any options to help me out here?

Currently it is set behind some closet doors with slats in it to let in the air, but it was so loud that we had to staple on some plastic to the top of the closet doors just to quiet down the fan noise (it was extremely unbearable before) but it is still too loud for my liking.

Is there any high efficiency furnaces that are actually quiet? Keep in mind that I have an AC unit for the summer time, and the furnace needs to be able to heat 1300ish square feet effectively in the cold northern alberta winter (it can get down to -45 here sometimes).

Thanks for your time, I look forward to hearing your suggestions!

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Old 12-02-2009, 09:05 PM   #2
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Quiet HVAC systems?


Your cure may be worse than the cause (the plastic is restricting airflow to the furnace and possibly causing the motor to run faster). In any event, is the noise a wind/whooshing noise from the registers? Is is a wind/whooshing noise from the closet door? Or is it a rumbling/droning/vibration noise from the furnace itself? The different noises will require different solutions.

Keith

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Old 12-03-2009, 09:56 AM   #3
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You, with the plastic, most likely are blocking the combustion air that the furnace needs to burn. This could be a very dangerous situtation.

Most modular homes around here have very undersized duct and oversized systems. Changing the equipment will most likely not help much. Make sure that whoever prices this for you looks closely at the ductwork.

Most high efficiency furnaces are pretty quiet.
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Old 12-03-2009, 10:36 AM   #4
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Quiet HVAC systems?


sktn77a: I can understand why this would be bad to do, however we had to do something. When the furnace came on it would wake us up (even with our doors shut!) that is how loud it gets. We only blocked the top half of the closet door, so it still has the bottom to draw air through, just the sound is bounced around a little more before it makes it's way out of the closet.

Also, the sound is not coming from the vents (they are quiet) or the door, it is coming from the furnace fan itself.


hvac122: I will make sure to keep that in mind when we have someone come by.
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Old 12-03-2009, 12:50 PM   #5
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Post pics of the closet and furnace.
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Old 12-03-2009, 02:23 PM   #6
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Quote:
Originally Posted by DigitalN. View Post
need to start talking louder in order to hear people.

Also, the sound is not coming from the vents (they are quiet) or the door, it is coming from the furnace fan itself.
Ordinary conversation, 60 dBA, from
http://trace.wisc.edu/docs/2004-About-dB/

Reducing RPM 13% reduces noise 50%, but watch the ΔT across the heat exchanger.

Last edited by Yoyizit; 12-03-2009 at 02:27 PM.
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Old 12-03-2009, 07:15 PM   #7
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Quiet HVAC systems?


Recently worked on a Nordyne counterflow in a modular home. Just like a mobile home they have no return air ducting throughout the house. The sound is air noise coming back to the furnace and the sound of the fan etc. Not much you can do. Most furnaces are in the basement or attic where you dont here most of the noise.
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Old 05-30-2012, 01:08 PM   #8
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have you ever found a solution,, get the furance put under?/ same situation as you
Quote:
Originally Posted by DigitalN. View Post
Hey all,

First post on this site and I can say I love looking at people progress through their projects... makes me want to get out and start working on mine!

Anyways, the reason I came in here. Right now I own a modular home, and while I love it, I am not a fan of the heating unit that came with the household. Since it is such an open floor design, when the furnace kicks in, you need to turn up the sound system to annoying levels, or need to start talking louder in order to hear people. The system is loud. Anyways, I am wondering if there is any options to help me out here?

Currently it is set behind some closet doors with slats in it to let in the air, but it was so loud that we had to staple on some plastic to the top of the closet doors just to quiet down the fan noise (it was extremely unbearable before) but it is still too loud for my liking.

Is there any high efficiency furnaces that are actually quiet? Keep in mind that I have an AC unit for the summer time, and the furnace needs to be able to heat 1300ish square feet effectively in the cold northern alberta winter (it can get down to -45 here sometimes).

Thanks for your time, I look forward to hearing your suggestions!

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