The data below shows that if any level of insulation is present in the roof that a simple white coating will reduce cooling costs by at least 10%. Even with no insulation it will drop real costs by 4%.
Annual Cooling Costs with Different Insulation Levels and Roof Colors
For a Single-Story 10,000 Square Foot Building in the Phoenix Area
Insulation Level Roof Color Annual Heating and Cooling Cost
($/square foot/year)
No insulation, R-0 Dark 2.26 Light 2.17
R-19 Dark 1.80 Light 1.69
R-30 Dark 1.23 Light 1.11
Source: APS 2009
Monty Bannerman
ArcStar Energy
646.402.5076
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