Study Verifies Coil Cleaning Saves Energy

From the American Society of Heating, Refrigerating and Air-Conditioning Engineers (ASHRAE) Journal Vol. 48, Nov. 2006:

Although it’s known theoretically that cleaning a coil can result in energy savings, little actual testing data and research exist to prove the point. As a result, building managers often ignore or reduce resources devoted to air-handler maintenance when faced with budget constraints. If proper maintenance is an important consideration in overall energy costs, conserving in that budget area can be self defeating.