Although costs will vary greatly depending on location and local circumstances, cool roof coatings on a low-slope roof might cost $6–$10 per square foot.
A California study found that cool roofs provide an average yearly net savings of almost 50 cents per square foot. This number includes the price premium for cool roofing products and increased heating costs in the winter as well as summertime energy savings, savings from downsizing cooling equipment, and reduced labor and material costs over time due to the longer life of cool roofs compared with conventional roofs.
To clarify, if you're building is 20,000 square feet you can expect a savings of over $10,000 annually - and this comes w/ a roofing system that is over 50% less expensive than conventional roofs.
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