GRAPH #2 Graph #2 illustrates the energy performance of the same house with the thermostat reprogrammed to control at 70°F during the day and 58°F during the night. 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 41.1% of the time, maintaining the house at 70°F during the day and limiting the house to a minimum of 58°F during the night with an average outside air temperature of 24.03°F. The boiler run time dropped by 9% using the night set back schedule; despite the fact that the outside air average temperature was 4.37F° colder than the first scenario. 8.155
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