Don't Waste your Money.
These houses, if it is relatively new, are all designed with ridge vents, mushroom vents and sofit vents. This allows the attic to vent naturally. Hot air rises, exits the high ridge and mushroom vents while relatively cooler/fresh air comes in through the sofit. By design the air is exchanged in the attic. If you save 5 bucks a month with a powered roof vent I think you would be doing really good. Payback would take forever. Besides by the time they payback the vents would most likely be non functional or the installer out of business. I doubt you would even notice when they stop running. Keep in mind they don't work at night, no sun. They don't do much early in the morning or late in the afternnon, again no direct sun. A wind powered turbine vent would really do better but they are cheap and not as green sounding so no company is going to market a wind turbine.
We had solar vents on our boat hatches. They did a great job clearing the air in the boat but it is a really small area with no natural ventilation compared to a house. Half of the vents were exhausting air and the other half were supplying air. Thats how we got air esxchange in the boat. The bad news they normally had to be replaced every 4 to 5 years due to deterioration or motor burn out.
It's a great marketing ploy, sounds great but not very efficient.
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