Sample Savings
Cool Metal Roof Retrofit
Joe needs to reroof his house in Sacramento. He currently has a dark blue metal roof and needs to replace it. A local roofing contractor gave him two options: select a traditional metal roof or a cool metal roof. There is a slight cost premium ($0.05 per square foot) for the cool roof option so Joe wants to know if a cool roof is going to be a better long term investment than a traditional roof.
Sample Savings: Cool Metal Roof Retrofit |
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Annual Cooling Energy Savings
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426 kWh
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Annual Heating Energy Penalty
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10 therms
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Lifetime Energy Cost Savings*
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$1,172
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Initial Cost Premium
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$100 (2,000 ft2 x $0.05 /ft2)
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Net Lifetime Cost Savings
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$1,072 ($1,172-$100)
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*Present value of energy savings assuming that the lifetime of the metal roof is 30 years.
New Cool Concrete Tile Roof
Richard is building a new home with a sloped roof (2,500 ft²). Richard’s friend suggested that he install a cool roof to save on cooling energy during hot summer months in Riverside. Richard wants to know how much he can save over the life of his roof by installing a cool concrete tile roof on his new home.
Sample Savings: New Cool Concrete Tile Roof |
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Annual Cooling Energy Savings
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565 kWh
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Annual Heating Energy Penalty
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13 therms
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Lifetime Energy Cost Savings*
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$1,582
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Initial Cost Premium
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$0
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Net Lifetime Cost Savings
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$1,582
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* Present value of energy savings assuming that the lifetime of the tile roof is 30 years.