Why Your Warsaw Flat Won’t Cool Down

11 July 2026 Poland Radar 0 Comments

Many people still trust ‘open windows in heat’ to cool apartments. This article explains why that backfires and what expats should do instead.

Poles do the opposite of Italians and Maltese during heatwaves, and that habit explains why many apartments refuse to cool down. Many people still trust open windows in heat as an instinctive fix. However, that habit often makes rooms hotter, not cooler.

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How Mediterranean architecture taught a different habit

In southern Europe, people learned to block the sun. Consequently, brown wooden shutters and Maltese muxrabija filter light. Moreover, those devices let air circulate without direct sun. Therefore, interiors stay cooler even in long heat waves. In addition, thick limestone walls on Malta absorb heat slowly. Consequently, they release it slowly at night. Thus, traditional buildings act like natural refrigerators for the evenings.

Why “open windows in heat” can backfire

Polish behavior makes sense during spring and autumn. However, summer heat flips that logic. If outside air is hotter, opening windows brings heat inside. Consequently, walls and floors soak up that heat. Later, they return warmth to the room during cooler nights. Therefore, an open window in midday turns your apartment into a heat reservoir. Moreover, closing windows and shutters creates a thermos effect. As a result, your place stays cooler for hours without power.

Practical schedule you can follow in Warsaw

Start by airing at dawn. Open windows wide between five and six a.m. Then close windows and sunshades before the sun intensifies. In addition, block the southern and western exposures first. Keep the apartment closed through the afternoon. Consequently, preserve the cool air you gained overnight. At night, open windows when outside air becomes cooler than inside. Moreover, leave windows ajar or use restrictors for safety. Therefore, you avoid overheating and reduce discomfort.

💡 GOOD TO KNOW: If you are an expat, note two Polish realities. First, landlords often expect tenants to handle minor home fixes. Therefore, ask your landlord to install window restrictors before summer. Second, Polish public institutions use different acronyms. ZUS handles social security, and NFZ is the public health fund. Moreover, your PESEL is the national ID number you often need for local services. In addition, Polish buildings sometimes have external shutters. If your flat lacks shutters, use thick, light-colored curtains or a temporary sheet. However, never leave windows fully open at night if children or pets live with you. Finally, local rules sometimes fine owners for blocking common stairwell ventilation. Therefore, check with your building manager before altering shared spaces.

If you live on the top floor, expect faster heating. Consequently, act early with shading. Moreover, if you work from home, accept a few hot hours in the morning. However, keep windows closed as scheduled. In addition, ventilating the stairwell at night helps the whole block. Therefore, coordinate with neighbors if possible. None of these measures replaces air conditioning above 35°C. However, they can lower indoor temperatures by several degrees in typical Polish heat waves without extra costs.

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