Is it worth opening windows during a heatwave? Experts weigh in

When the sun is mercilessly hot, everyone looks for ways to cool down. Intense sunlight can do more harm than good. Many people wonder if opening windows in high temperatures is a good idea. Research results may surprise you.

It's worth opening windows early in the morning or the evening when the temperature is much lower. The coolness at these times helps maintain thermal inertia, meaning the ventilated room heats up more slowly. However, when the sun is at its peak, it's best to cover the windows using blinds or curtains. This way, the heat will not penetrate the house or apartment. Use a space blanket or aluminum foil if you don't have blinds or curtains. These materials act like mirrors, helping to maintain a constant temperature in the room.

Recalling some basic physical principles is helpful to cool your apartment. The phenomenon of enthalpy explains how much energy is needed for a substance to change its state. In the case of water, a specific amount of energy is required for evaporation, and this process cools the room. A similar process occurs in the human body. For instance, you can fill an unglazed pot with fine sand and pour water. Ensure the sand is moist. Next, direct a fan towards the pot, which will initiate the enthalpy process.

For many people, the ideal solution is to install air conditioning. It works because warm air is lighter than cool air. Alternatively, you can use fans, which are more common and cheaper. Fans can reduce the time it takes to cool rooms by a few degrees. The solar chimney effect can be helpful for apartments on higher floors, drawing cooler air from the lower floors upward.

What should you do if you can't open the windows and don't have a fan? The Government Security Center has provided a few tips you should follow on hot days:

• Minimize being outdoors in direct sunlight.
• Drink plenty of water - preferably 2-3 quarts per day.
• Wear a hat outdoors to protect yourself from overheating and scalp burns.
• Wear airy, light clothing - linen is a good choice.
• Do not leave pets or children in cars.
• Apply sunscreen before leaving the house.
• Avoid consuming alcohol as it causes dehydration.
• Limit physical exertion and stay at home if possible.