;Your utility bill is a great indication of energy consumption, but it says very little about energy usage. If you want to get a clearer picture of that, add a new device to your toolbox. "Effective energy management is data-driven," says Paul Stiller, director of energy management at Summit Energy Services. "Each building is unique and you need the specific facts for it." "Data loggers can be configured in a variety of ways and deployed many times," Stiller says, adding that different types can measure temperature, relative humidity, CO_2 levels, motor run times, electricity usage, and on/off cycles. "You want to make sure building systems perform as efficiently as they were designed to, because in most cases we find that they don't," says Gregg Daly, director of sales for manufacturer Onset Computer Corporation.
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