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#4656492 - 02/04/18 11:38 PM recommend a good solar attic fan?
daves66nova Offline


Registered: 04/11/04
Posts: 3655
Loc: los angeles
I'm looking to install one on my roof here soon. What's a decent one? Thanks
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#4656499 - 02/04/18 11:59 PM Re: recommend a good solar attic fan? [Re: daves66nova]
Dyusik Offline


Registered: 09/26/14
Posts: 2015
Loc: US-WA
No clue what's good in the solars but here is a thought. More inlet screens (the 2x4x24's) will produce a massive amount of ventilation without any additional mechanical supplement. In the summer heat, I open the access panel in the garage and a huge current of air rushes through. A gable vent is also a good idea.
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#4656549 - 02/05/18 03:51 AM Re: recommend a good solar attic fan? [Re: Dyusik]
fields Offline


Registered: 04/11/03
Posts: 120
Loc: TX
My dad had a 4 X 8 sheet of plywood on the porch we would take down for summer.

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#4656593 - 02/05/18 06:45 AM Re: recommend a good solar attic fan? [Re: fields]
daves66nova Offline


Registered: 04/11/04
Posts: 3655
Loc: los angeles
Originally Posted By: fields
My dad had a 4 X 8 sheet of plywood on the porch we would take down for summer.
So what does that have to do with RECOMMENDING a solar fan???
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#4656623 - 02/05/18 07:24 AM Re: recommend a good solar attic fan? [Re: daves66nova]
tom slick Offline


Registered: 05/26/03
Posts: 9308
Loc: Central Coast, Calif.
I installed US Sunlight fans about 5 years ago. Iíve had no issues with them and they move a lot of air.
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#4656633 - 02/05/18 07:42 AM Re: recommend a good solar attic fan? [Re: daves66nova]
Cujet Offline


Registered: 02/15/03
Posts: 7248
Loc: Jupiter, Florida


I have that exact setup (the two of them pictured) pictured on the solarfanatics website. It's quite good, they move a good bit of air, and they've held up to 3 direct hit hurricanes.

This model is available from various sources, so make sure to shop around for a good price.

http://www.solarfanatics.com/



Edited by Cujet (02/05/18 07:45 AM)
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#4656668 - 02/05/18 08:35 AM Re: recommend a good solar attic fan? [Re: daves66nova]
JLawrence08648 Offline


Registered: 01/20/17
Posts: 261
Loc: NJ
You need draw from the right locations to move heat out. If you use an attic fan, you should seal your gable vents and have no ridge vents only soffit vents. This will create draw from the bottom moving heat out. Your attic fan should be near the peak. If you put an attic fan in without blocking the gable, and have a ridge vent, the air will pull from the gable or the ridge vent but the doctor vent. You will not be moving the heat away from the inside ceiling of the living space of the house.

Also you need velocity. Drawing from the larger gable vents you are not creating velocity. It's best to draw from a smaller area to create velocity, which the soffit vents are.

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#4656685 - 02/05/18 08:53 AM Re: recommend a good solar attic fan? [Re: daves66nova]
RTexasF Offline


Registered: 10/01/02
Posts: 2905
Loc: North TX
Our two powered attic vents needed replacing so I looked into the solar powered ones. For us the cost was prohibitive. We ended up with two standard electric powered replacements installed for less than the price of one solar powered model in a box. No doubt the solar would prove less expensive in use over time but we're in (or near) our 70's so standard power made more sense.

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#4656696 - 02/05/18 09:09 AM Re: recommend a good solar attic fan? [Re: daves66nova]
barkingspider Offline


Registered: 12/22/13
Posts: 2067
Loc: socal
When I researched this years ago, I learned that the electrical fans move a ton more air than solar for less money. I just donít know that any of the solar powered one would make a noticeable difference. Thatís why I chose not to get a solar fan
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#4656732 - 02/05/18 09:36 AM Re: recommend a good solar attic fan? [Re: daves66nova]
BJD78 Offline


Registered: 08/05/17
Posts: 513
Loc: Nebraska
Had 2 Remington 20 watt solar fans about $200.00 each from home depot. They keep our attic a good 15 degrees cooler that out door air and worked well for 3 years then we had a bad driving hailstorm in 2016 and it shattered the solar panels. Did not feel like spending $400 again so elected to go with 2 cheaper passive spinning turbine vents instead and they seem to work well also. Not sure how often you get hail storms in LA but if you do not get hail or hail is very rare a solar fan would probably be the best option.
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#4656786 - 02/05/18 10:19 AM Re: recommend a good solar attic fan? [Re: daves66nova]
Rat407 Offline


Registered: 12/13/02
Posts: 1509
Loc: North Carolina
A ridge vent is the way to go, unless you do not have enough ridge to properly vent the roof. Then a power vent works best.

Solar attic vent vs ridge vent
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#4656957 - 02/05/18 01:16 PM Re: recommend a good solar attic fan? [Re: daves66nova]
DBMaster Offline


Registered: 09/18/12
Posts: 5341
Loc: DFW
My house was built with ridge vents. They are definitely effective, but by adding an electric (not solar) fan to the mix I measure a 10 degree temperature drop in the attic area that is directly above the ceiling.

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#4657630 - 02/06/18 07:00 AM Re: recommend a good solar attic fan? [Re: daves66nova]
Cujet Offline


Registered: 02/15/03
Posts: 7248
Loc: Jupiter, Florida
I have two mounted near the roof peak. I live in South Florida, so it's sunny and hot. They do not move anywhere near as much air as a big 120V powered fan would. However, I've also found that I don't need that much air moved. As these things are sufficiently capable of moving the heat out.

My home is 2500 square feet, plus a 3 car garage with a large storage attic over the garage, and a good sized patio. Total roof area is about 3500 square feet.

My house has eves that are well vented and just the 2 fans. The airflow is clearly robust, and standing in the attic staircase, one can feel the upward airflow.

The attic temp is maintained at roughly the outdoor temp. It's no problem what so ever, to go in the attic and work.

My previous home had ridge vents. The attic was regularly 140 degrees.

Ah ha! I've found the actual brand (natural light) and they are available here: https://www.amazon.com/Solar-Attic-24-watt-25-year-warranty/dp/B001OULVQM


Edited by Cujet (02/06/18 07:10 AM)
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