Why are there different types of houses in different regions?

Weather conditions have always dictated materials and design of buildings. In the desert moisture resistant materials (cedar,vinyl etc..) are not as important as in a rainforest. High peak roofs (steep) are also not necessary to shed heavy rain/snow loads in the desert. Stucco siding is efficient in desert areas, but not suited for moist climates as stucco makes a good home for moss/mildew which can promote rot once it breaches the outer seal of the structure.