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
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.

Sample Savings: New Cool Concrete Tile Roof
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.