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GALLERY: The 10 Coolest Skyscrapers in the United States

Dec. 30, 2013
One opened in 1901. Another opened in 2013. What do they have in common? They're both totally cool. Here are the 10 coolest skyscrapers in the land.

HVAC engineers and architects may not always see eye-to-eye when it comes to designing in enough room for HVAC systems, but you have to admit that the architects can come up with some pretty striking designs from time to time. Here are the 10 coolest skyscrapers in the United States, as selected by HPAC Engineering Senior Editor Ron Rajecki.