GRAPH #3 Graph #3 illustrates the energy performance of the same house with the thermostat reprogrammed to control at 63°F during the day and 58°F during the night. This programming reflects the normal values of operation that suit the owner. The red line illustrates the room temperature, the green line illustrates the outside air temperature and the blue line illustrates the run time of the burner. The computer trending program provides the highest, the lowest and the average value for each of the three channels. The boiler was required to run 32.3% of the time, maintaining the house at 63°F during the day and limiting the house to a minimum of 58°F during the night with an average outside air temperature of 25.92°F. The boiler run time dropped by 28.5% from the first scenario using the reduced day setting with the night set back schedule; despite the fact that the average outside air temperature was 2.48F° colder. From our environment's viewpoint, the increase in run time from 32.3% in the third scenario, to the 45.2% in the first scenario, represents an increased energy consumption of 39.9%. 8.157
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