Canada is a country of weather extremes, and especially here in Calgary, it can get absolutely sweltering in the summer. While the warm weather is great when you’re relaxing, it’s not so much fun when you’re stuck in traffic in the city, or staring down hundreds of miles of hot prairie highways. Overheating in a vehicle is not only a cause of minor irritation and drowsiness, it can even lead to dehydration and danger – which isn’t a good combination with big tractor-trailers or heavy utility vehicles. And that’s why a functional heavy truck air conditioning unit is a must for drivers on these blazing summer days.