Coolhouse

Open or close the windows

Only for iPhone

Free · Designed for iPhone. Not verified for macOS.

iPhone

Heatwave? Coolhouse tells you whether to open or close your windows — right now and hour by hour — to keep your home cool, without AC. Coolhouse — should you open the windows? During hot weather, the right move isn't always obvious: opening at the wrong time heats your home up. Coolhouse tells you whether to open or close your windows right now — and when — to keep the inside cool, without air conditioning. The app compares your city's outdoor temperature with your indoor temperature in real time, and applies rules drawn from scientific studies. Nothing is made up. What Coolhouse does: • A clear verdict at a glance: OPEN, CLOSE or airing possible • The right window to ventilate, hour by hour • Tropical night warning (overnight low ≥ 20 °C / 68 °F) • Estimated indoor temperature, adjustable to how it actually feels • Next action to plan ahead (“remember to close before noon”) • Automatic location or manual city search — your last place is remembered Science-based advice: Every rule is sourced and viewable in the app — including the WHO and building thermal-comfort standards (EN 16798-1, ASHRAE 55, CIBSE). Your privacy: No account, no ads. Your location is used only to fetch local weather and is never shared. — Thermal-comfort guidance, not medical advice. In an emergency, call your local emergency number.

Ratings & Reviews

  • This app hasn’t received enough ratings or reviews to display an overview.

What's new in version 1.1: • Tailored advice: describe your home (walls, floor, orientation, insulation, ventilation) and the estimated indoor temperature adapts to its thermal inertia and solar gains. • Shutter tip: when to close your sun protection to block heat before it gets in. • Notifications: get reminded of the right moment to open or close — and on tropical nights. • Redesigned home screen: the verdict at a glance. • Fixes and various improvements.

Version 1.1

The developer, Arnaud Allouis, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy .

  • Data Not Linked to You

    The following data may be collected but it is not linked to your identity:

    • Location
    • Identifiers
    • Usage Data

Privacy practices may vary, for example, based on the features you use or your age. Learn More

Accessibility

The developer has not yet indicated which accessibility features this app supports. Learn More

Information

Seller
  • Arnaud Allouis
Size
  • 44.9 MB
Category
  • Weather
Compatibility
Requires iOS 15.1 or later.
  • iPhone
    Requires iOS 15.1 or later.
  • iPod touch
    Requires iOS 15.1 or later.
  • Mac
    Requires macOS 12.0 or later and a Mac with Apple M1 chip or later.
  • Apple Vision
    Requires visionOS 1.0 or later.
Languages
English and 2 more
  • English, French, German
Age Rating
4+
Copyright
  • © 2026 CausticMethods
  • Developer Website
  • Privacy Policy

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