When it comes to looking for solar powered attic ventilation, Costco might be worth checking out. At Costco, you can find a couple of solar powered ventilation unit; for the attic as well as all purpose. The solar attic ventilation unit costs around $350 and can ventilate up to 1250 square feet. This unit is very quiet and easy install and would probably be a good choice if you're looking to ventilate your house more efficiently. Then you also have a solar power all purpose ventilation unit which could be used for the roof, crawl spaces, the attic as well as gable ventilation. This ventilator removes heat built up which happens during the summer, and it removes moisture in the winter which could otherwise lead to mold. This unit costs around $270 at Costco. So if you're looking for environmentally friendly, energy efficient ways of making your home cooler and more ventilated, then these products might be just what you've been looking for. 
Solar Powered Attic Ventilator
"Impact & ultraviolet light resistant engineered ABS shroud. Galvanized & powder coated metal components resist rust. High output 38 volt motor. Commercial grade 12-watt solar panel. Temperature sensing switch included: Shuts off motor on cold days or bypass the switch for year around operation. Installation instructions in English and Spanish included. Oversized flashing designed for leak-proof installation. Attractive black powder coating blends in with any roof color. Lowers your energy costs: Attic temperatures can exceed 160°F in the summer heating up ducting and radiating heat into the interior of the home. Extends the life of common asphalt shingles" 
Solar Power All Purpose Ventilator
"The new All Purpose Ventilator from U. S. Sunlight Corp. is the most advanced and versatile ventilation device available. It is the perfect solution for tile roofs, crawl spaces, gable ventilation, and to “turbo-charge” existing static vents in your roof. The All Purpose Ventilator removes heat build-up in your attic in the summer and removes harmful moisture in the winter. The advanced design provides more efficient ventilation while using no electricity." These products can be found at costco.com
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