6 reasons your room gets hotter even when everything is closed

In Delhi, most buildings are made of brick and concrete, which are excellent at soaking up heat. Throughout the day, your exterior walls absorb the intense sunlight. Even after the sun goes down, these walls stay hot and slowly "leak" that heat into your room, much like an oven that stays warm long after it is turned off. If your room faces the West, your walls are likely radiating heat directly onto you all evening.

Windows are often the weakest link in your room’s defense. Standard glass allows "radiant heat" to pass through easily. Even if the window is closed, the glass itself gets scorching hot and acts like a heater. If you don't have thick, light-colored curtains or "blackout" blinds, the sunlight hits your floor and furniture, heating them up and turning your room into a mini-greenhouse.

Every electronic device in your room—your laptop, television, and even your phone charger—generates a small amount of heat while running. If your room is tightly sealed, this heat has nowhere to go and builds up over time. Similarly, if your room is near the kitchen, the heat from cooking travels through the walls and corridors, getting trapped in your living space and raising the temperature by several degrees.

If you live on the top floor or in a standalone house, your roof is your biggest enemy. Exposed to the overhead Delhi sun for 10+ hours, the concrete slab becomes incredibly hot. This heat travels downward through the ceiling. Without "cool roof" paint or a layer of mud-phaska, your ceiling effectively becomes a giant radiator that beams heat down onto your bed all night long.

Even with closed windows, heat can "sneak" in through tiny gaps. Look at the space under your door or the edges of your window frames. Hot air from the rest of the house or the balcony is under higher pressure and will force its way into your cooler room through these cracks. It’s like trying to keep a boat afloat with a tiny hole in the bottom; the outside environment will always try to get in.

When you close everything up to keep the heat out, you also stop air from moving. Stagnant air feels much hotter because it holds onto the moisture (sweat) from your body, preventing you from cooling down naturally. Without a way for the "old" warm air to escape—like an exhaust fan or a brief period of cross-ventilation—the air inside just sits and gets "heavy," making the room feel like a sauna.

(Disclaimer: This story is for educational purposes alone and should not be considered as professional medical advice and does not substitute any medical advice.)