Practical advice
Heat guides
The same advice that ships inside the Ventilate app, free to read. Seven guides: ventilate the home, match the weather, understand layout, judge whether outdoor air is worth letting in, stay cool, city heatwaves, and why cities get hotter.
Your home
When to ventilate, how the season changes how long you open, how layout sets the cooling ceiling, and whether outdoor air is worth letting in.
8 articles
How to ventilate your home during a heatwave
When to open your windows, when to keep them shut, how to shade the glass, and where to put a fan so it actually helps.
6 articles
How weather changes when you ventilate
Dry heat, sticky nights, cold snaps, and Mediterranean or continental seasons change the same window rules. Shade by day in summer. Air briefly when it is cold.
5 articles
How your apartment layout sets the cooling ceiling
Single-sided flats, cross-ventilation, courtyards versus the street, top floors, night flush, and balcony doors. The building you have decides how much free cooling you can actually get.
4 articles
When cooler air is not worth letting in
Outdoor air can be cooler and still be a bad deal, because of pollution, pollen, high UV on the sunny side, or sticky dew point. Temperature still leads. These signals only narrow the opening.
Your comfort
Once the building is doing what it can: your body, drinks, pets, and plants.
Your city
Why nights stay hot, and which public choices actually change the temperature.
5 articles
Heatwaves in European cities, and why nights stay hot
Urban heat islands make Paris, Madrid, Rome, Berlin, and Lisbon nights warmer than the countryside. Same physics, different streets. Here is how that changes when you can actually ventilate.
2 articles
Why cities get hotter, and what actually cools them
Urban heat islands explained, why your street stays warm after dark, and which public choices make a real difference to summer temperatures.
These guides are informational and are not medical advice. If heat is making you unwell, follow your local health agency’s guidance.