11601 Plano Rd, #108, Dallas TX 75243
Information about Solar Ventilation:
Solar Attic Fans: Pros and Cons
Studies show a reduction in attic temperature of 30% and AC usage of 6%
Solar powered with zero greenhouse gas emissions
Increase comfort in hard to cool attic spaces or other rooms
Very positive consumer reviews
Easy installation (less than an hour typically)
- Financial payback may be limited depending on electricity prices and cost of unit
- Potential risks due to backdraft of appliances fumes (e.g. natural gas heaters)
- May be more attractive alternatives to reduce AC costs
- They do not have a battery - so they do run during cloudy days nor at night.
- For 100% power, the solar panel must have 100% sun on the solar panel. As the sun sets, you loose power.
** Lastly, another concern mentioned by several opponents of solar attic fans is that flue gases from appliances such as a natural gas water heater can be backdraft into the house. This is a real concern and potentially dangerous, so should be analyzed by a professional if you decide to install a solar attic fan.
How a Solar Attic Fan Works.
Important not to mix Solar fans with any other type of ventilation. Like a river, air flow will take the less of resistance. This means passiver type vnts will act as an intake pushing the hot attic air down back into your attic and possibly into your home.
Source: Florida Solar Energy Center
An attic fan works by pulling warm air out of the attic to allow for cooler air to come through the gable or soffit vents to reduce the air temperature in the attic. By reducing the air temperature in the attic, cooling demands in the rest of the house can be reduced. Proponents of attic fans also claim that a more moderate attic temperature can also extend the life of roofing materials, although that is harder to prove and more likely driven by the UV exposure of the roof.
A solar powered attic fan does just want the name implies – these are attic fans with attached medium-sized solar panels. When exposed to sunlight during the day, the panels will generate electricity to power the DC motor in the unit and turn the fan. Although they only run on solar during the day, some units can be connected to batteries to run at night. So the solar powered units provide the same benefit as a normal attic fan, but have zero costs to operate.
How Many Solar Attic Fans Do I Need? Important Measurements
Solar attic fans ability to move air is measured in cubic fee per minute (CFM) and a good rule of thumb that manufacturer use is that 1,000 CFM can handle a 1,600 square foot attic (1.6 square feet per CFM). Most of the models that we reviewed could handle more than 2,000 square feet, which should cover most attics.
The other important measure is the wattage of the panels, which are measured in watts and based on standard operating procedures. So be aware that if your roof does not have adequate sun exposure, you may not generate enough power to run the fans. Check out the solar radiation in your area using the Department of Energy’s database.
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2018 - Bold Roofing co. 11601 Plano Rd. 108, Dallas TX. 75243 (972)380-9300 .
Best Ventilation types, Vent Ridge, Turbines, Whirely bird, Low Profile, Turtle types, roof vents and gable Vents. Ask you Bold Roofing Team member and the best type of Ventilation for you home.
DFW Roofing Co. Since 1979
Builders License No. 1130767
Bold Roofing 2018 Currently Roofing in Allen, Arlington, Plano, Carrollton, Valley Ranch, Irving, Coppell, Flower Mound, Lewsiville, Rocvkwall, Prosper, Garland, South Lake and Colleyville.