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In nergy -efficient architecture,the sun,water and wind are used to heat abuilding when the weather is cold and to cool it in summet.This is mostly based on design and building meterial.Thick walls of stone or mud were used in traditonal architecture as an insulator.small doors and windows kept direct sunlight and heatout .Deeply-set glass windows in colonial homes ,on which direct sunlight could not reach ,permitted the use of glass with out creating a greenhouse effect;verandahs also served a similar purpose.Traditional bungalowsalso had high roofs and venitilators that permittedhot air to rise and leave the room .Cross-ventilationhwere wind can drive the air in and out of a room keeps it cool .