Ventilate: When to Open

If the last few days have left you drained, sticky, and unsure what to do with your windows, you are not alone. When the heat will not let go, every choice feels heavy: open and let warm air in, or close and trap the warmth you already have? Ventilate is a calm guide for exactly that moment. It looks at your local weather, your indoor temperature, and each window in your home, then tells you when to close, when to open, and where to place a fan so cool air actually reaches you. No lectures, no guilt, just clear next steps when your head is too foggy to guess.

Built for real heatwaves

Per-window advice: close, crack open, open wide, or fan placement

Timing that follows the weather, not the clock

Fan guides matched to your layout (single-sided or cross-ventilation)

Gentle reminders before the next change

Heat toolkit: cool yourself, protect windows, and more

Set up once, then breathe

Point your phone at each window so the app knows which way it faces and what is outside. Add your indoor temperature when you can. A thermometer helps, but you can start without one.

Private by design

Everything runs on your device. No account. No ads. Your home stays yours.

When the evening finally cools, Ventilate helps you catch that window, before the heat builds again tomorrow.