# Lüften — Cool your home naturally

> Cool your home naturally (iPhone/iPad app by RUBEN JAN K DEPOVER.)

- Source: https://appshunter.io/ios/app/luften/id6780240402 (this page in markdown: same URL + `.md`)
- Developer: [RUBEN JAN K DEPOVER](https://appshunter.io/developer/1896334755)
- Category: Utilities, Weather
- Price: Free
- Age rating: 4+
- Requires: iOS 13.0 · 36 MB
- Languages: American English
- Released: 2026-06-25
- Data updated: 2026-06-27
- User reviews in markdown: https://appshunter.io/ios/app/luften/id6780240402/reviews.md

## What is Lüften?

Open your windows at the right moment. Close them before the heat gets back in.
  
Lüften watches tonight's forecast and tells you the two moments that matter: when outside has cooled enough to bring fresh air in, and when it's about to warm up again. That's it.
 
WHY IT WORKS
Passive cooling — moving cool night air through your home — is one of the most effective ways to keep a house comfortable without air conditioning. The problem is timing: open too early and you let warm air in; wait too long and you miss the cool window. Lüften solves the timing problem.
  
WHAT YOU GET
• An alert when outside drops cool enough to open your windows
• An alert before the heat returns in the morning 
• A forecast view showing your opening window for tonight
• No indoor sensors, no smart home, no account
  
HOW IT WORKS
Set your location once. Lüften fetches your local weather forecast and works out the best window-opening window for tonight. At most two notifications a day — one to open, one to close.
  
PRIVACY FIRST
No account. No sign-in. Everything stays on your device. Your location is used only to fetch the local forecast and is never shared.


## Version history (last 1 release)

### 1.0 — 2026-06-25

No release notes.

## More apps by RUBEN JAN K DEPOVER

- [DriftNote — ADHD Journal](https://appshunter.io/ios/app/driftnote-adhd-journal/id6766889808)
- [Swimmo](https://appshunter.io/ios/app/swimmo/id6768076736)

All apps by RUBEN JAN K DEPOVER: https://appshunter.io/developer/1896334755

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*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-06-27.*