Stuffy corridors, dripping vents and a D grade for energy efficiency: These were just some of the problems plaguing the board at One Grand Army Plaza, in Brooklyn’s Prospect Heights. Built in 2008, the glass-clad, 15-story condo has long been uncomfortable inside during the summer. “We were getting a tremendous amount of humidity and the floors were becoming slick,” says board president Marla Maritzer. Having previously worked with En-Power Group to replace the aging chiller and partially electrify, the board turned to the engineering firm again to problem-solve the building’s inefficient ventilation.    Read the article…………………………….