Ventilate: When to Open
Beat the heatwave: when to open, close, and fresh air
Hot apartment, no air conditioning, and every window decision feels urgent. Open too early and you pull heat in. Close too late and you trap it. Ventilate is a calm guide for that moment.
It looks at local weather, your indoor temperature, and each window in your home, then tells you whether to close, crack open, open wide, or aim a fan. Advice follows the forecast, not a clock. Setup is once: point your phone at each window so the app knows which way it faces. No account required. Core advice stays free.
Ventilate Pro is optional. It adds outdoor air quality, pollen, UV, and humidity, and uses those signals when cooler air outside is not always clean air to let in.
Features
• Per-window advice: close, crack open, open wide, or place a fan
• Timing that follows local weather and sun on each facade
• Indoor vs outdoor history over 24 hours, 7 days, or 30 days
• Sparkline on the dashboard for how today compares with yesterday
• Fan placement tips for single-sided and cross-ventilation homes
• Gentle reminders before the next recommended change
• Heat toolkit with practical guides for hot nights and heatwaves
• Home screen widget, plus shortcuts (and Live Activity on iOS)
• Optional Ventilate Pro: AQI, pollen, UV, humidity, and 24-hour forecast curves
Use Cases
• Get through a heatwave in a home without air conditioning
• Time a night flush when evening air finally drops
• Know which windows to close on the sunny side at peak heat
• Place a fan so it actually moves cool air through the room
• Track how many degrees you cooled (or warmed) over a few days
• Decide whether cooler outdoor air is worth opening for, when pollen, UV, or air quality is poor (Pro)
• Check the next action from the home screen without opening the app
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