Efforts to cut energy costs in buildings can have unexpected results. It is even possible for a lighting upgrade to inadvertently affect IAQ. In other cases, cooling savings expected from reduced lighting wattage didn't happen. In both situations, a little planning could have avoided some nasty surprises.
In one installation, the reduction in lighting wattage yielded impressive electrical savings but resulted in an increase in reheat energy consumption. How come? While the calculated cooling load due to lower lighting wattage had indeed been reduced, no change had been made to the cooling coil discharge temperature.
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