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This is an interesting product, but realize that the speed of the exhaust fan and the size of the vent are limited, so substantial reductions of inside temperature aren't likely. Nevertheless, since the outside air coming into the car is likely to be of a lower temperature than the interior air being exhausted, this device may partially moderate heat build-up in the vehicle's interior, which could help to reduce the air conditioning load on start-up.

Note that this device requires direct sunlight to operate properly. It is not appropriate for use in vehicles with heavily tinted windows, and will not work well on cloudy days.

• Manufacturer Model #: IWP-7000