The Viesa Internal II cab cooler maximizes its cooling performance by being mounted on the back of a truck’s cab, the company says, away from the sun’s rays. This allows it to operate day and night without the need to run the truck’s engine. It’s especially designed for high-roof trucks.

Said to be economical and maintenance-free, the cooler eliminates idling costs and expensive A/C repairs. It features programmable on-off operation and it self-adjusts to exterior temperatures. Its automatic vent opening and closing system prevents dirt and dust from entering the cab, Viesa says.

The cooler consumes only water and makes no use of chemical coolants, nor does it emit gases into the atmosphere.

It ends air-conditioning maintenance and, because it works even with the engine stopped, it’s also claimed to decrease wear and tear on engine parts. The cooler operates from the truck’s existing battery with low amperage draw and automatically shuts off on a low-battery warning. It incorporates polarity and surge protection.