Ethan, I just looked back at their press release, and those savings figures are for the single day (it isn't clear whether they take man-hours of preparation into account). According to CBRE, this would total $6.9 million in savings annually (36,000 tons of carbon).It looks like pretty simple stuff--turning back the thermostats by a degree, reducing fan speeds, and turning off lights. They also trained occupants, I believe.
It's not clear how they calculated the savings--whether this was taken from energy-monitoring equipment or modeled based on average usage data.
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