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Old 05-23-2010, 04:11 PM   #1
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Attic fan


I have a 2 story house in Chicago. the family room and garage share a common attic. There is 10" of loose insualltion over the family room (none over garage) and the family room has always been 6-7 degrees hotter than the rest of the house in summer and colder in the winter. Today for example is 89 degrees outside, 80 degrees in other parts of the house and 86 degrees in the family room (107 degrees in attic). Would an attic fan help in cooling that room? I do plan adding some more insulation also.

Thanks,

Tim

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Old 05-23-2010, 04:51 PM   #2
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The family room is on the SW corner of the house? It's on a concrete slab on the ground?


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Old 05-23-2010, 05:51 PM   #3
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Opposite...NE corner. The house in on crawl space. I installed a concrete floor, insulation on walls, dehumidifier so it maintains 65-68 degrees with 45 humidity all year.

I would liek to add then when I had my soffit replaced, I had them add vents/holes the length of the house and they is a round vent in the attic.
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Old 05-23-2010, 06:30 PM   #4
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I don't know what is heating up your family room.
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Old 05-23-2010, 06:39 PM   #5
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get a thermal camera if you can or one of those devices that you can point and get a thermal reading. this can help find the hot spots
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Old 05-23-2010, 06:45 PM   #6
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think it could be the insulation? I have 10"(R-22) and R-49 is recommended so I am short about 10"? Where would one go about getting a thermal camera/pointer?
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Old 05-23-2010, 06:51 PM   #7
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you may find one in hardware stores or look in yellow pages and start asking insulation companies if they can point you in right direction. i have also found here in va you can usually get insulation w/ install cheaper than you can buy it. If they think they are looking at some work and they have the tool they may give you a read for free
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Old 05-23-2010, 07:28 PM   #8
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Is the attic air sealed?

Is it forced-air heating/cooling?

Page #2 and 3: http://www.wag-aic.org/1999/WAG_99_baker.pdf

Explain the round hole vent in the attic---- exhaust? Is it a balanced system, or way more inlet than exhaust?
http://www.airvent.com/homeowner/pro...it-specs.shtml

http://www.fureyco.com/content/image...ng_The_Air.pdf

Sealing air leaks: http://www.rd.com/how-to-seal-attic-...icle18158.html

Don't use a fan band-aid yet, until you find the answer: http://www.ronhungarter.com/black_mold.html

Be safe, Gary
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Old 05-23-2010, 07:47 PM   #9
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It's a balanced system, sorta. The North side of the house has soffit and there are holes drilled the entire way and there is round circlular vent on the roof. There are no pipes, lights, etc...coming through this attic so I guess it's sealed. If there are soffits, why would it be necessary to see if it's sealed anyway since the soffits are making it not air tight? Sorry for the dump question, but learning.

On the last link you posted with the mold, since I only have the soffits as vents, shouldn't I have a fan go to the exsiting vent in the roof?
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Old 05-24-2010, 09:36 AM   #10
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One thought on attic fans: In my area, within the last four months, there have been three (3) homes burn to the ground with the State Fire Marshal reporting that the cause(s) of the fires were the attic fans. One of these is a good friend of mine, one is a neighbor, the other I do not know. Most attic fans are wired into a circuit with other applications and are on anything from a 15 amp-30 amp circuit breaker. In my experience, with my business, I've gone into attics with customer calls and found attic fan motors "froze up", not running, and the power is still on the motor causing tremendous heat buildup. These motors are not shorted out so they will not trip the circuit breaker, just continue to build up heat. I-ME, install an inline fuse when replacing an attic fan, whether it's a roof mount or gable mount. I show/tell the homeowner what this is and what it is for. IF the fan were to quit again, the HO should know to check this fuse, or have someone check it. I've looked at attic fans at our local suppliers and have yet to see one with a built-in thermal overload or fused at the fan motor. Just a though, David
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Old 05-24-2010, 12:03 PM   #11
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Quote:
Originally Posted by timchi29 View Post
Where would one go about getting a thermal camera/pointer?
Any digital camera is sensitive to infrared, and they have a a filter inside to make the colors come out right.
By the same token, you can buy a lens filter on the web to filter out visible light so your regular camera can then be used as an IR meter.

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