It’s not just you: restaurants, malls, and offices on steamy summer days really are kept colder than necessary. Air conditioning is as much about dehumidification as it is about cooling, especially in hot, humid climates like the U.S. South, where buildings can be fertile ground for hazardous molds.  “The reason they blast the air conditioner so much is because they’re trying to reduce the humidity,” Sorin Grama, co-founder and CEO of Transaera , told TechCrunch. “In some cases in commercial buildings, the air is so cold that they have to reheat it back up.” So Transaera has developed a new type of ventilation unit that, the company says, is significantly more efficient than existing dehumidification techniques, saving users energy and money. Amazon, which has been testing the unit for several months in Houston, recently signed on as a customer. Other companies are following suit, to the point where Transaera now has “nine figures” worth of purchasing targets from customers, Grama said.…