Allow ventilation during the coolest hours and restrict it during the warmest hours. If the climate permits it, plant trees around the building. Not only do trees provide shade, but evaporation/transpiration of water from the trees costs 600 calories or 2500 joules per gram of water evaporated/transpired. If water is available and inexpensive enough, spray it around the building for further evaporative cooling.
1. Use only white colour for exterior of house/building. The roof top also should have white colour coating or white tiles.
2. Plant trees around the building. Plant more trees on western side.
3. Use thick curtains on doors & windows during warmest hours.
4. Use LED bulbs only.
5. Rooms with refrigerator & ovens should have very good ventilation.
6. Moping floors with wet cloth in afternoon.
Not sure if you have access to 'Khus' or Vetiver grass but mats made out of this grass and soaked in water can be put on the doors and windows of the house/building. As the water evaporates from these mats, it brings down the room temperature.
I overlooked the excellent suggestion by Prasoon Gargava to use only white-color paint for the exterior of the house/building. But for maximum contribution to cooling, the paint should be not only (a) white (good reflector/poor radiator) at wavelengths of solar radiation, but also (b) black (good radiator/poor reflector) at wavelengths about 20 times longer corresponding to infrared radiation at Earth-like temperatures. (a) minimizes absorption of solar radiation during the day, and (b) maximizes infrared radiation to space at night. Snow has both properties (a) and (b), and both contribute to snow-covered regions staying cold. The best paint would mimic snow in this respect.
https://piazza-resources.s3.amazonaws.com/j6n1u4bkv444cy/j6xt7c80a157i2/Dahl_2013.pdf?AWSAccessKeyId=AKIAIEDNRLJ4AZKBW6HA&Expires=1518452418&Signature=mzfO5zVi0pCQ5N9P1c7149dBDBE%3D
https://www.energystar.gov/ia/partners/publications/pubdocs/HeatingCoolingGuide%20FINAL_9-4-09.pdf
http://www.yesmagazine.org/planet/how-to-keep-your-cool-without-air-conditioning
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