Heatwave and climate-sensitive architecture

Karachi is once again facing effects of the intense heatwave. We need to step back and adapt to the old norms of our forefathers because in our busy schedules we have forgotten to perform small acts of kindness that go a long way. Having said that, I don’t mean we have become senseless but, in some cases, an enabling environment has been affected despite Karachi being far ahead in terms of philanthropy. Old houses have been replaced by portions, leaving almost no room for a garden area for planting trees and placing water bowls for birds or wall-fitted water coolers. 

Concrete, asbestos in some cases, and an increased portion of glass walls is trapping in heat, increasing the need for air conditioning even during times it may not have been needed. Resultantly, it adds burden on the resources of the power utility serving the city.

Karachi must also look beyond temporary relief and rethink how its buildings are designed. Nature already offers powerful lessons. Termite mounds survive extreme heat through thick, porous earthen walls and solar-driven convection that naturally circulates air and regulates temperature. Architects around the world have adapted these biomimicry principles through passive cooling, thermal-mass walls, shaded openings, courtyards, and ventilation chimneys. Such designs can reduce dependence on air conditioners, lower electricity demand, and make buildings more resilient during heatwaves. For a city like Karachi, where heat and dense construction combine into a public health crisis, climate-sensitive architecture is no longer a luxury; it is a necessity!

ALI ALTAF

KARACHI