July 1, 2025, 2:40 pm | Read time: 2 minutes
During the summer, days and nights inside your home can become almost unbearable. Even with windows and curtains closed, the temperature rises hourly. However, there’s a simple trick that can help cool things down.
Grandma always said to mop the floor when the heat comes. It’s especially useful before going to bed, as it lets us sleep in pleasant coolness. myHOMEBOOK explains the trick behind it and why it works.
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Why You Should Mop the Floor in the Heat
On hot days, it’s often not easy to create a comfortable climate in the apartment—especially if there’s no air conditioning. In addition to well-known measures such as early ventilation or darkening the rooms, there are also less noticed but effective methods.
One of these is mopping the floor—a simple trick our grandmothers used to provide some relief on hot summer days. What seems unremarkable at first glance can subtly improve the room climate and enhance well-being. While the effect isn’t as immediate as a fan, it’s still noticeable. The air feels fresher, the room cleaner, and overall more pleasant.
Why the Trick Works
The trick of mopping works against heat because it uses a simple physical effect: evaporative cooling. When water evaporates from the floor, it requires energy in the form of heat—this energy is drawn from the surroundings, meaning the air and the floor surface. This causes the room temperature to drop slightly or at least feel fresher. This effect is the same as sweating: When sweat evaporates from the skin, it cools the body.
Since the effect only lasts for a limited time, it’s recommended to mop the floor in the evening before sleeping. With the freshness and coolness in the room, falling asleep is much easier.
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Mopping the Floor in the Heat Has Additional Benefits
Mopping the room on warm days not only provides a cooler environment, but it also binds dust. Especially in summer, when there’s a lot of ventilation, more dust and pollen enter the apartment. Mopping binds these particles before they can be stirred up. This improves air quality and protects the respiratory system. Additionally, a freshly mopped floor feels pleasant in summer, especially when walking barefoot. This directly contributes to overall well-being.