2)Characteristics: The graph shows 1 hour intervals, 24 hours a day. The graph represents parts or whole hours of operation. A solid line drawn from top to bottom indicates an entire hour of operation, either On or Off, a sloped line indicated that the PTAC was operating On and Off during a portion of that hour. A sloped line is indicative of a period where the PTAC was left running and is controlled by the Energy Eye™ System because it means that the room temperature was cycling on or off. If the user had been turning the PTAC On or Off manually the vertical line would be completely straight up or down, indicating that the unit was turned On or Off without cycling. As we can see by this graph the PTAC was left on for nearly the entire duration of the recording.

Smaller spikes in run-time indicate that the PTAC was cycling On and Off during un-occupied periods to maintain the setback optimized temperature of 60 degrees Fahrenheit. A taller spike is indicative that the PTAC is running a larger portion of the hour to maintain the temperature or that the outside temperature differential is greater. A shorter spike or no spikes at all indicate that the outside temperature does not necessitate the PTAC to run in order to maintain the setback temperature.

3)Occupancy: The guest was checked into the room the evening of the first day (Monday) and was checked out of the room the morning (Saturday) of the second to last day. Occupied periods are evidenced by the large Orange columns where the PTAC was operating for several full hour periods. During these periods the PTAC did not shut off or it would be indicated by presence of Blue space. It is interesting to see that the guest occupying this room typically arrived at around 12am to 1 am in the morning before sleeping and left the room around 8am the next morning. During the entire night period you can see that the PTAC did not shut off such as is common with other Guestroom Energy Management Systems. The guest was never disturbed during their sleeping period. This is the hallmark of the Energy Eye™ System, it is nearly invisible in operation to the guest! The graph also shows that the guest typically returned for about a 1 to 2 hour period in the evening at around 6pm and again left until 12am.

4)Savings: Savings is measured by reduced runtime of the HVAC. With a PTAC Heat Pump this is easily measured. A typical unit in good condition will run at around 1.3KW on reverse heat pump setting and around 3KW during heating element operation. Because we can see that during un-occupied periods the Energy Eye™ System was maintaining a setback temperature it means that the PTAC was left on nearly the whole time. That means nearly the whole Blue area of the graph is saved runtime by using the Energy Eye™. By subtracting the un-occupied periods (last day) we can see a good picture of the runtimes saved by Energy Eye. It turns out that 58% percent of the occupied period Energy Eye™ controlled unnecessary use by turning the PTAC OFF. It is clear that during the occupied periods the PTAC was on and running to the guests satisfaction. This means that for this guest in this room there was arguably at least a 50% runtime savings which at a modest 1.3KW operation is over 230 kWh!