Per-window advice
Close, crack open, open wide, or place a fan, based on weather and each window’s orientation.
App Store · Google Play
Ventilate.
At the right time.
Ventilate uses your home layout, window directions, indoor temperature, and local weather to tell you when to open, when to close, and how to place a fan, without air conditioning.
Your home
Building profile, cross-ventilation or single-sided layout, fan inventory.
Weather & transitions
Local forecasts and your next recommended action, with timely reminders.
On your device
No account. Your home data stays local. WeatherKit for weather only.
Heat, without panic.
Close during the day when it’s hotter outside. Open at night when the air cools. Place the fan in the right spot. Ventilate guides you, window by window.
Heat guides
The same advice that ships inside the Ventilate app, free to read. Three guides: one for your home, one for your comfort, and one for why cities get hotter.
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.
How to stay cool indoors without air conditioning
Cooling your body, what to drink and eat, keeping pets safe, and using water in a room without making it worse.
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.
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Contact us
A question about Ventilate? Send us a message.