"Reducing the Summer Peak With Evaporatively Cooled Condensers" was the subject of a presentation by Gary Hogsett, P.E., energy management specialist, Tetra Tech EM Inc. "A problem in our part of the country [Kansas City] is the summer peak electric usage," said Hogsett. He did research on evaporatively cooled condensers to determine what electricity savings they may provide.
Hogsett said a sample rooftop unit at 75°F has a 12.1 kW draw. When the roof heats up to 105°, it has a 17.1 kW draw. When the roof heats to 125°, the draw is 21 kW - almost twice the draw at 75°.