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Old 07-14-2010, 02:12 PM   #16
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Solar Attic Fan: Does it Work?


attic to living area sealing is very important consideration when talking power ventilation,you want as little of that expensive conditioned air being pulled into the attic

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Old 07-14-2010, 02:20 PM   #17
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Solar Attic Fan: Does it Work?


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Originally Posted by Halen12 View Post
I don't know about thoses turbine vents since I don't have them, but from what I've read it's debateable if they work much. First, they require wind to spin the turbine. Second if that bulb (turbine) spinning around was such a good design for moving air from one side to another then all of our powered fans we use to blow air would utilize that method instead of the blades.
You are incorrect about the wind. A turbine will spin up from heat rising and begin the spinning of the turbine, then the siphoning effect keeps it going moving air out of the attic. Two different types of physics between the turbine and a powered fan.

Want real air movement.. go mount a squirrel cage! :D
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Old 07-14-2010, 02:21 PM   #18
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Solar Attic Fan: Does it Work?


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attic to living area sealing is very important consideration when talking power ventilation,you want as little of that expensive conditioned air being pulled into the attic
One reason people should make sure thier soffit is vented correctly to give the path of least resistance. Also dont go buying the biggest fan for a 850sqft home either.
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Old 08-18-2010, 04:34 PM   #19
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Solar Attic Fan: Does it Work?


I spent a lot of money on solar fans in the past two months. I have a one story house with a dark shingle roof with a large attic that you can stand up in. I live in Southern California two miles from the beach so it is rarely over 76 degrees.

I put two solar fans in my attic and added three dormer vents low down. The salesman said he hoped the temperature would drop to 80-90 degrees. I didn't measure the temperature before the fans but I estimate that it was at least 120 and possibly 130. After the fans were installed, the temperature was 95 at 2PM on a day when the outside temperature is 76.

The salesman's son told me (after I'd purchased the fans) that he'd installed these fans in Florida and that, after installation, the temperature never dropped more than 18 degrees there.

I also replaced an electric fan in the garage with a solar fan and added one dormer vent at a low elevation for more air flow. The electric fan did a great job but it was noisy. I was worried it would overheat resulting in a fire. I had set the thermostat on the electric fan to 106 so that it wouldn't run all the time but this meant that the garage was often in the 80's.

The solar fan in the garage runs starting early in the morning. By mid-afternoon, the garage is in the 80's. The sun is blocked by 3:00 so the solar fan stops running in the garage and the heat is then trapped for a few hours. As soon as a cloud or something covers the solar panel, the fan stops. The advantage of the solar fan is that I don't have the noise or worry about fire. I am very disappointed, however, in the temperature in the garage. I was hoping for 70's -- not 80's.

Two of the fans were Solar Star and one was Solara, which the installer said was a much better made fan. Solar Star won't disclose its CFM. My installer said that none of the CFMs for solar fans are accurate and that I shouldn't trust any of the numbers. My conclusion is that electric fans are much more powerful but noisy and they sometimes catch fire.

I have a good afternoon breeze at the beach and I suspect that if I had installed large vents on both sides of the attic, I'd have a much better result.
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Old 01-20-2014, 11:30 PM   #20
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Solar Attic Fan: Does it Work?


Solar Attic Fans have gotten much more efficient in recent years. My husband and I have gotten them for several of our rental houses. We use http://solaratticfansource.com as they have different options for different applications.
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Old 01-21-2014, 06:11 AM   #21
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Old 02-02-2014, 02:41 PM   #22
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It seems to me that if you have the proper amount of attic insulation, then 100 degree attic or a 115 degree attic wouldn't affect the living space too much....
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Old 02-02-2014, 03:09 PM   #23
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Solar Attic Fan: Does it Work?


Two keys to any type of powered attic ventilation (electric or solar). First, make sure you have the proper amount of soffit ventilation in relation to the cfm rating of the fan. Second, make sure you have air sealed your conditioned space from the attic.

Otherwise, you very well may be pulling conditioned air out of your living space into the attic and exhausting it out the vents.
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Old 02-12-2014, 07:50 AM   #24
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do u know if solar vent could be reversed so you could have heat in winter our heat is broke and so am i.
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Old 02-13-2014, 10:38 AM   #25
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No. Cannot be, nor should it be, reversed.

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