But according to the national research council of canada a green roof can reduce air conditioning.
Green roof 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.
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.
There are many different reported benefits that the addition of a green roof to a building can offer.
The exact amount of savings is difficult to calculate as utility costs vary from state to state.
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 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.
Shading the outer surface of the building envelope has been shown to be more effective than internal insulation.
Many studies have been conducted to assess the extent of energy savings possible with extensive green roofs.