How to Keep Cool in Germany Without Air Conditioning: 6 Practical Tips

Introduction

If you moved to Germany from a warmer country — or even from a place where air conditioning is considered a basic household feature — your first German summer can come as a real surprise. Air conditioning is genuinely rare here: in private homes, it is almost unheard of, and even offices and public buildings often go without. Germany's building stock was largely designed for cold weather insulation, not heat management. But with summers getting hotter and heatwaves becoming more frequent — the summers of 2019, 2022, and 2023 all broke temperature records — knowing how to manage heat in a German flat is a practical life skill. Here are six methods that actually work.

Ventilation: The Core Strategy

The most important concept in German heat management is Querlüftung — cross-ventilation. The basic principle: open windows on opposite sides of your home in the early morning and late evening when outside temperatures drop, then close everything — windows, shutters, and curtains — during the hottest part of the day (roughly 11am to 6pm).

This feels counterintuitive if you're used to opening windows when it's hot, but it works. You are essentially trapping the cooler night air inside and preventing warm air from entering during peak heat hours. Even a 3–4 degree difference between indoor and outdoor temperatures makes a significant difference in comfort.

Practical tip: The best times for ventilation in summer are before 9am and after 8pm. Check a local weather app for the exact temperature curve in your city.

Shutters and Curtains: Use What's Already There

One thing Germany does have — unlike many countries — is Rollläden: external roller shutters on most windows. If your flat has them, use them. Keeping Rollläden down during the day blocks solar heat gain before it enters your home, which is far more effective than curtains inside the glass.

If your flat does not have Rollläden, thick curtains or blackout blinds on south- and west-facing windows make a meaningful difference. Reflective window film (available cheaply at hardware stores like Bauhaus or OBI) can also help block heat on particularly sunny windows.

Fans: How to Use Them Effectively

Fans do not actually cool air — they cool people by moving air across the skin and speeding up sweat evaporation. Pointing a fan at yourself is more effective than pointing it at the room.

A simple trick: place a shallow bowl or tray of ice or cold water in front of a fan. As the fan blows air over the cold surface, it creates a slightly cooler breeze. It won't match air conditioning, but it provides noticeable short-term relief during peak afternoon heat.

At night, a fan placed facing out of a window can actively push hot air out of the room.

Cooling Your Body Directly

When the building itself has stored heat, you need to focus on cooling yourself rather than the space around you. Practical approaches:

• Cold water on pulse points: wrists, neck, temples, and the back of the knees cool you down faster than splashing your face.
• Cool (not ice cold) showers: very cold showers cause the body to generate heat in response. Lukewarm showers are more effective for lasting relief.
• Light, loose cotton clothing: avoid synthetic fabrics, which trap heat.
• Stay hydrated: this sounds obvious but Germans often drink less water than recommended. Herbal teas (even warm ones) and water-rich foods like cucumber and watermelon help.

Managing Heat Sources Inside the Flat

During heatwaves, every electrical device in your flat is also a heat source. Reducing internal heat generation matters more than most people realize:

• Use the oven as little as possible — opt for cold meals, salads, or outdoor grilling.
• Avoid running the dishwasher or washing machine during the hottest hours of the day.
• Switch off devices fully rather than leaving them on standby — standby modes still generate small amounts of heat.
• LED bulbs produce significantly less heat than older incandescent or halogen bulbs. If you haven't switched yet, summer is a good reason to.

Know Your Rights as a Tenant

For expats renting in Germany, it is worth knowing that landlords are not legally required to provide air conditioning in residential properties. However, if your flat becomes dangerously hot due to a structural issue — for example, a flat under a roof (Dachgeschoss) with inadequate insulation — you may have grounds to discuss remediation with your landlord.

Extreme heat in a poorly insulated Dachgeschoss flat is a known issue in Germany. If you are apartment hunting and planning for summer, it is worth checking which floor a flat is on and whether it has external shutters.

Frequently Asked Questions

Can I install an air conditioner in my German rental flat?

Generally, you need your landlord's permission to install any fixed appliance that involves structural changes — including most air conditioning units. Mobile (portable) AC units that vent through a window do not require structural changes, but they are expensive to run and not particularly energy-efficient. Some landlords may also object even to portable units if they require leaving windows permanently open. Always check your rental contract and ask your landlord before purchasing.

Why don't German buildings have air conditioning?

Historically, Germany's climate was considered temperate enough that AC was unnecessary and expensive to install. German buildings are designed primarily for winter insulation, which means they also trap heat in summer. As climate change increases summer temperatures, this is becoming a recognized problem. Some newer office buildings and commercial spaces are being built with cooling systems, but this has not yet become standard in residential construction.

Conclusion and Next Steps

Surviving a German summer without air conditioning is very doable once you understand how locals manage it — mainly through smart ventilation timing, using Rollläden effectively, and focusing on cooling your body rather than the whole apartment. If you are renting, get familiar with your flat's sun exposure and check whether external shutters are installed before the heatwave season hits.

For longer-term comfort, a good portable fan, some blackout curtains, and an understanding of the Querlüftung principle will take you a long way.

Source: The Local