An article on Contracting Business.com called “Clean Coils Make Sense—and Save Cents”, written by Troy Rybicki, gives a great, clear explanation of why keeping HVAC coils clean saves you money and energy.  Check it out  at

contractingbusiness.com/.../clean-coils-make-sense-and-save-cents

Increase energy efficiency even more with PreVent outside air intake filter screens. They add to your long-term savings by preventing coils from getting dirty at the point of entry and cutting down on the need for costly repeat cleaning, especially during the summer cottonwood season. Find out more at www.permatron.com/.../rooftop-equipment.aspx