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To incorporate environmentally friendly or sustainable / low energy features in the building they need to be included as part of the design strategy, adding "green" bolt on solutions is unlikely to be effective. For example to reduce energy use it will be better to design a naturally ventilated building incorporating thermal storage in the building mass, instead of adding solar panels to drive the air conditioning in a conventional solution. The brief to the designers needs to be clear about what is required at the outset, to change a standard solution later will be more difficult to achieve. There are publications from the Chartered Institution of Building Services Engineers which give extensive guidance on low energy building.