It depends on the usage frequency, maintenance and quality of the device. An evaporative cooler of a good brand lasts for several years, provided there is routine cleaning and maintenance before and after usage.
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According to Kenneth Taylor, the 3 best cold air intakes for your chevy Silverado are the K&N Cold Air Intake Kit 77-3082KP, the K&N Cold Air Intake Kit 63-3082 and the K&N Cold Air Intake Kit 57-3058.