Evanair-Conditioner

The 1938 Hupmobile Evanair-Conditioner, with the concurrent Nash Weather Eye (qv), were the automobile industry's first fresh-air heating systems.

The Hupmobile system differed from the better-known Nash system by drawing up to 150 cubic feet of fresh outside air per minute through special hood louvers and thence through filters and heating coils into the passenger compartment. The Evanair-Conditioner, unlike the Weather Eye, was mounted entirely within the engine compartment, and the hot-water control switch was mounted on the dashboard.

The then-revolutionary principles of both the Hupmobile Evanair-Conditioner and the Nash Weather Eye are still in use today in nearly every motor vehicle.