Why choose ENERGY STAR reflective roofing for your building?
ENERGY STAR qualified roof products reflect more of the sun's rays. This can
lower roof surface temperature by up to 100F, decreasing the amount of heat
transferred into a building.
ENERGY STAR qualified roof products can help reduce the amount of air
conditioning needed in buildings, and can reduce peak cooling demand by 10–15
During building design and when your existing roof needs replacement are both
excellent times to consider reflective roofing
ENERGY STAR® labeled roof products can help you save money and the
environment by reducing your energy use. They work by reflecting more of the sun's
energy back into the atmosphere, keeping your building cooler and reducing your air
conditioning bills. Because much of the United State's electricity is generated by
burning fossil fuels, creating air pollution, reducing the amount of energy needed to
cool buildings helps to reduce the production of air pollutants.
In addition, the air in urban areas can be 6-8°F hotter than surrounding rural areas.
Scientists call these areas "urban heat islands." These heat islands can make the
effects of local air pollution, like smog worse, and can increase the cooling costs for
buildings within the area affected by the heat island.
A cool roof calculator helps you estimate how much energy and money you can save
by installing an ENERGY STAR® labeled roof product on your home or building.
Please take note of the following when using the roofing calculator.
The building should be an air-conditioned residence (assumed to have a roof with
20% slope), office, or retail/commercial building. No savings are available for a
building that is not air conditioned, although a reflective roof can make it cooler.
The calculator asks you to supply the equivalent flat roof area. If you are calculating
the savings for a building with a sloped roof you should specify the area of the floor
space covered by the roof. For multi-story building give the square footage under the
roof (usually the top story).
The calculator calculates net savings for buildings, balancing cooling savings with
minor increases in heating costs. The calculator works for buildings heated by gas or
an electric heat pump.
To correctly calculate cooling savings and heating costs, this calculator takes into
account the amount of insulation in your roof. Savings from cool roofs are largest for
lightly insulated roofs. Buildings with highly insulated roofs save energy during the
heating season and the cooling season because the insulation slows the flow of heat
into and out of your building. See map for insulation levels recommended by the DOE.
The roofing calculator is intended to roughly estimate the savings a reflective roof can
offer to a typical building and aid in the decision whether to choose a reflective roof. If
you are interested in estimating savings for a particular building or calculating
cost-benefit ratios for a project you should consider using a detailed building energy
The roofing calculator estimates annual energy savings for typical building types with
non-metallic-surfaced roofs using typical weather conditions. These estimates were
derived based on simulations run with the DOE-2.1E model using cooling and
heating degree-days. Actual savings will differ based on building design, building
operation, cooling and heating equipment, and local weather.
The roofing calculator does not include savings from monthly peak demand reduction
charges, reflective roof rebate programs, or load-curtailment programs. The roofing
calculator does not include the effect of snow on a roof. Snow on a roof may reduce
the heating penalty associated with a reflective roof by providing some additional
insulation depending on the depth of the snow.
:: EPA Cool Roof Design and Installation ::