The exact amount of savings is difficult to calculate as utility costs vary from state to state.
Green roof savings.
Green roofs are a passive cooling technique that stop incoming solar radiation from reaching the building structure below.
One of these benefits is the potential for building energy savings where a green roof can reduce annual heating and cooling loads.
There are many different reported benefits that the addition of a green roof to a building can offer.
Many studies have been conducted to assess the extent of energy savings possible with extensive green roofs.
Over its estimated lifespan of 40 years a green roof would save about 200 000 of which nearly two thirds would come from reduced energy costs.
The study looked at a range of benefits of green roofs including stormwater management improved health benefits due to reduced pollution and energy savings.
Green roof temperatures can be 30 40 f lower than those of conventional roofs and can reduce city wide ambient temperatures by up to 5 f.
Green roofs reduce the heat flux through the roof and less energy for cooling or heating can lead to significant cost savings.
1 2 in addition green roofs can reduce building energy use by 0 7 compared to conventional roofs reducing peak electricity demand and leading to an annual savings of 0 23 per square foot of the roof.