Hot arid climates have long, hot summers and short, sunny winters, and the daily temperatures range widely between dawn and the warmest part of the afternoon.
Arizona is an example of a hot arid climate. Buildings designed for hot arid climates feature heat and sun control, and often try to increase humidity. They take advantage of wind and rain for cooling and humidity, and make the most of the cooler winter sun.
Windows and outdoor spaces are shaded from the sun, and summer shade is provided to the east and west and over the roof. Enclosed courtyards offer shade and encourage air movement, and the presence of a fountain or pool and plants increases humidity. Even small bodies of water produce a psychological and physical evaporative cooling effect. Sites in valleys near a watercourse keep cooler than poorly ventilated locations. In warm climates, sunlit surfaces should be a light color, to reflect as much sun as possible.
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