What Thermostats Teach Us about the B2B Internet of Things?

We just got a new thermostat in the house from EcoBee. Their claim to fame is that instead of one sensor (at the thermostat), you can put temperature measurement devices around the room or space to generate a better picture of the living environment, be more comfortable, and save energy.  Pretty cool, new solution to an old problem:  how do we allocate expensive and scarce resources (in this case, heat), more effectively?

I wonder what business problems could be solved by moving from a single point of measurement to multiple measurement points.  The sensors have to be cheap (either embedded into a process already done or solved with cheap technology).  Instrumenting various other parts of the organization might lead to allocating expensive and finite/scare resources more effectively?