For existing buildings, there's no question.... Technologies called building energy management systems essentially sit on top of the building automation system. Using algorithms and logic rules, they look for faults in the way in which the building is operated. They're very appealing because they typically have a return—on the office buildings that we looked at—of somewhere between eight and 12 months and typically you will pick up about 15% energy cost savings.
If you think about opex and capex, you could easily pay for this out of opex. It's really compelling in that regard.
Another thing that's really compelling is that it's non-disruptive. That system could be installed in a building without anybody ever knowing it, except for the person who pays the bill. It provides collateral benefits.