# Ventilate

> A heatwave ventilation app. It uses your home layout, window directions, indoor temperature, and local weather to tell you when to open, when to close, and where to place a fan — without air conditioning.

Ventilate is published by Vivace App Studio. Core advice is free. Optional Ventilate Pro adds outdoor air quality, pollen, UV, and humidity. Outdoor weather comes from Open-Meteo (CC BY 4.0). This file is a curated map for language models. Full English guide text is at https://getventilate.app/llms-full.txt.

## Product

- [Ventilate](https://getventilate.app/): When to open, close, and use a fan during a heatwave.
- [Heat guides](https://getventilate.app/guides/): Six clusters: ventilating, apartment layouts, air worth letting in, staying cool, city heatwaves, and urban heat.
- [App Store](https://apps.apple.com/app/id6786653699): iOS listing.
- [Google Play](https://play.google.com/store/apps/details?id=fr.vivaceappstudio.whenopenmywindow): Android listing.

## Locales

- [Guides (English)](https://getventilate.app/guides/): Full heat-guide hub in English.
- [Guides (French)](https://getventilate.app/fr/guides/): Full heat-guide hub in French.
- [Guides (Spanish)](https://getventilate.app/es/guides/): Full heat-guide hub in Spanish.
- [Guides (German)](https://getventilate.app/de/guides/): Full heat-guide hub in German.

## Your home

- [How to ventilate your home during a heatwave](https://getventilate.app/guides/ventilating-your-home/): 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.
- [The three phases of heat in your home](https://getventilate.app/guides/ventilating-your-home/phases-of-heat/): A heatwave is not one long problem but three, and each has its own answer. Keep heat out, cool down, then hold what you gained.
- [How to protect your windows from the sun](https://getventilate.app/guides/ventilating-your-home/protect-your-windows-from-the-sun/): Sunlight through glass is the biggest source of daytime heat in most homes. Blocking it outside the window beats anything you do inside.
- [Where to place a fan in a single-sided or cross-ventilated home](https://getventilate.app/guides/ventilating-your-home/where-to-place-a-fan/): A fan does not cool air, it moves it. Where you put it depends entirely on whether your windows are on one façade or on opposite sides.
- [Why your home stays hot after a heatwave](https://getventilate.app/guides/ventilating-your-home/after-the-heatwave/): The forecast dropped ten degrees and your flat did not. Walls, floors, and furniture store heat and give it back for days.
- [How your apartment layout sets the cooling ceiling](https://getventilate.app/guides/apartment-layouts/): Single-sided flats, cross-ventilation, courtyards versus the street, top floors, night flush, and balcony doors. The building you have decides how much free cooling you can actually get.
- [Single-sided flats versus cross-ventilation](https://getventilate.app/guides/apartment-layouts/single-sided-or-cross-ventilation/): Windows on one façade cannot flush a home the way opposite façades can. Here is how to tell which layout you have, and what to do with a fan in each case.
- [Courtyard windows versus the street](https://getventilate.app/guides/apartment-layouts/courtyard-or-street-windows/): The cooler intake is usually the greener, shadier, more sheltered side. Street façades hold heat, noise, and often worse air. Use them as exhaust when you can.
- [Why top-floor flats stay hotter](https://getventilate.app/guides/apartment-layouts/top-floor-heat/): The roof takes the sun all day and radiates into the rooms all night. Top floors need stricter daytime shading and a longer night flush than the flats below.
- [How to flush heat out of a flat at night](https://getventilate.app/guides/apartment-layouts/night-flush-ventilation/): Night ventilation is the only free cooling most homes without AC get. It only works when outdoor air is cooler than indoor air, and city heat islands make that window shorter.
- [Balcony doors versus small high windows](https://getventilate.app/guides/apartment-layouts/balcony-doors-and-small-windows/): A sliding door moves a lot of air, and a lot of sun. A small high window does neither well. Match the opening you have to intake, exhaust, and daytime shade.
- [When cooler air is not worth letting in](https://getventilate.app/guides/air-worth-letting-in/): Outdoor air can be cooler and still be a bad deal, because of pollution, pollen, high UV on the sunny side, or sticky dew point. Temperature still leads. These signals only narrow the opening.
- [Dew point, not humidity, tells you when to open](https://getventilate.app/guides/air-worth-letting-in/dew-point-best-moment-to-open/): Relative humidity is a percentage. Dew point is the temperature that makes air feel sticky. Use it to decide between a short opening and throwing every window wide.
- [Dirty outdoor air versus indoor heat](https://getventilate.app/guides/air-worth-letting-in/dirty-air-versus-indoor-heat/): Poor air quality is a reason to keep windows mostly closed. Indoor heat during a heatwave is also a health risk. Temperature still leads when the room is already very hot.
- [Pollen and whether to open the windows](https://getventilate.app/guides/air-worth-letting-in/pollen-and-open-windows/): Pollen only changes window advice if you said you are sensitive. High counts mean a smaller opening. Very high counts mean closed, unless the room is already dangerously hot.
- [High UV and windows on the sunny side](https://getventilate.app/guides/air-worth-letting-in/high-uv-and-sunny-windows/): A UV index of 6 or more is high. Those hours are also when sun on glass dumps heat into the room. Close the sunny side; shade-side windows can still follow the temperature.

## Your comfort

- [How to stay cool indoors without air conditioning](https://getventilate.app/guides/staying-cool-indoors/): Cooling your body, what to drink and eat, keeping pets safe, and using water in a room without making it worse.
- [How to cool your body down in a heatwave](https://getventilate.app/guides/staying-cool-indoors/how-to-cool-down/): Your body sheds heat by evaporating sweat. Moving air, light clothing, and a fine mist of water all work with that, and cost nothing.
- [What to drink and eat during a heatwave](https://getventilate.app/guides/staying-cool-indoors/what-to-drink-and-eat/): Steady sipping beats catching up, cool beats ice-cold, and the meal you cook matters as much as the food you eat.
- [How to keep pets safe in a heatwave](https://getventilate.app/guides/staying-cool-indoors/keeping-pets-safe/): Animals overheat faster than people and cannot tell you when it is too much. What to provide, what to avoid, and when to call a vet.
- [Watering plants and floors to cool a room](https://getventilate.app/guides/staying-cool-indoors/watering-plants-and-floors/): A little water can make a room feel cooler, but only when air is moving. Too much, and you have swapped heat for humidity.

## Your city

- [Heatwaves in European cities, and why nights stay hot](https://getventilate.app/guides/city-heatwaves/): Urban heat islands make Paris, Madrid, Rome, Berlin, and Lisbon nights warmer than the countryside. Same physics, different streets. Here is how that changes when you can actually ventilate.
- [Heatwaves in Paris, and the night the street stays warm](https://getventilate.app/guides/city-heatwaves/paris/): Paris often runs several degrees hotter than the Île-de-France countryside after dark. Courtyards, zinc roofs, and mineral streets shorten the hours when you can actually ventilate.
- [Heatwaves in Madrid, dry heat and a street that holds the day](https://getventilate.app/guides/city-heatwaves/madrid/): Madrid days run very hot and dry. The heat island still matters at night, when asphalt gives the sun back. Shade hard by day, then flush only when the street has actually cooled.
- [Heatwaves in Rome, stone that keeps the afternoon](https://getventilate.app/guides/city-heatwaves/rome/): Rome's historic core stores heat in stone and narrow streets. Nights start late. Courtyards and thick walls delay the peak, then delay the cool-down. Flush when the air is actually cooler, not when the bells say evening.
- [Heatwaves in Berlin, shorter spikes and a real centre island](https://getventilate.app/guides/city-heatwaves/berlin/): Berlin heatwaves are often shorter than southern ones, and parks help. The centre still holds heat after dark. Do not skip shutters on the first hot day, and do not trust a countryside night for Mitte.
- [Heatwaves in Lisbon, Atlantic air that feels heavier than it reads](https://getventilate.app/guides/city-heatwaves/lisbon/): Lisbon sits on hills above the river, with Atlantic humidity. Nights can fail to dry out even when the thermometer drops a little. Heat islands on mineral streets make the useful opening shorter and stickier.
- [Why cities get hotter, and what actually cools them](https://getventilate.app/guides/heat-and-cities/): Urban heat islands explained, why your street stays warm after dark, and which public choices make a real difference to summer temperatures.
- [What is an urban heat island?](https://getventilate.app/guides/heat-and-cities/urban-heat-islands/): Cities can run several degrees hotter than the countryside on summer nights. Here is why, and what it means for ventilating your own flat.
- [Heatwaves and public choices](https://getventilate.app/guides/heat-and-cities/heatwaves-and-public-choices/): How hot your city feels is not only the forecast. It is also shaped by zoning, tree budgets, roof materials, and climate policy.

## Optional

- [Privacy Policy](https://getventilate.app/privacy/): How Ventilate handles data on device, Open-Meteo, stores, and RevenueCat.
- [Terms of Use](https://getventilate.app/terms/): Terms for the Ventilate app, including store-handled payments.
- [Sitemap](https://getventilate.app/sitemap.xml): All indexable URLs.