Chicago skyscrapers go green, slash energy costs
CHICAGO (AFP) - Chicago's skyline is going green, as property managers install energy efficient tools like motion-detectors on office lights, in a project officials hope will inspire changes across the United States.
At the riverside Sheraton hotel, chief engineer Ryan Egan cannot get over what his new thermostats can do - or the US$136,000 (S$166,040) a year in savings they are producing.
First off, they're tied into the booking management system, which means he can let the room temperature drift beyond standard comfort levels until the moment a guest checks in.
An infrared sensor means the savings don't stop there. Once the guest leaves the room, the temperature starts to drift again, giving the heating or cooling system a break until it's needed again.