Sample Savings
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.
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Sample Savings: Cool Metal Roof Retrofit |
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| Annual Cooling Energy Savings | 426 kWh |
| Annual Heating Energy Penalty | 10 therms |
| Lifetime Energy Cost Savings* | $1,172 |
| Initial Cost Premium | $100 (2,000 ft2 x $0.05 /ft2) |
| Net Lifetime Cost Savings | $1,072 ($1,172-$100) |
*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.
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Sample Savings: New Cool Concrete Tile Roof |
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| Annual Cooling Energy Savings | 565 kWh |
| Annual Heating Energy Penalty | 13 therms |
| Lifetime Energy Cost Savings* | $1,582 |
| Initial Cost Premium | $0 |
| Net Lifetime Cost Savings | $1,582 |
* Present value of energy savings assuming that the lifetime of the tile roof is 30 years.