Summers in India can get extremely hot. In fact, a strong heatwave is about to sweep across various parts of the country over the next few days, and it will cause the temperatures to climb in many states. Forecasts are also showing that the temperatures will keep rising over the next two to three weeks as we enter the peak of summer.
According to reports, Delhi-NCR is expected to cross the 40C mark, while Uttar Pradesh and Rajasthan may touch 42C-43C. Maharashtra is also likely to feel the heatwave conditions, along with Madhya Pradesh, Odisha and Chhattisgarh are also expected to go through the same this week.
So, is you do not have an air conditioner at home or aren’t very happy with the high bills that come your way during the summer, you can
use the power of science to hack your way to a home that is cooler than usual.
Air movement is about the management of air pressure and temperature zones. If you are following the principle of directing airflow outwards, the important thing to remember is that this lesson in physics will only be effective if the external environment is conducive.
During summer, using a fan the right way can make a room feel much cooler without changing the air temperature itself. The goal is not to “cool the room,” but to make the air move over your skin so sweat can dry more easily, which is what makes you feel cooler.
If you point a table-top fan so it blows air out of the room, it can pull hot outside air in through other openings, and you may not feel enough breeze on your skin. But if you turn the fan around so it blows inward, the air can spread through the room in a fuller, more even way, and you get that refreshing wind‑chill effect on your body.
In a study titled An Improved FFR Design with a Ventilation Fan: CFD Simulation and Validation, researchers used computational fluid dynamics to show how fan orientation changes the way air “hugs” a space. They found that fans blowing inward tend to create a cup-shaped airflow pattern. This pattern is often more effective at circulating air throughout the entire volume of a room, rather than just pulling a narrow stream of air toward a window.
In hot, humid weather, just bringing in outside air may not help much because the air is already hot and sticky. Here, the trick is to move air faster over your skin so sweat can still evaporate. This means aiming fans directly at people, not just at a wall or window.
Opening windows at different heights—one lower and one higher—also helps, because warm air naturally rises and can escape through the top window while cooler air comes in from below.
Timing helps too: bring air in through shady windows during the day, and switch to pushing hot air out when the evening air is cooler than the indoor air. Keeping fans and windows clean, and shielding them from direct sun, makes this simple “cool‑air‑path” system work better and bring real relief on summer days.
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