Block sun before it comes through glass
External shading works best, but renters and flat dwellers often have to work inside. Blackout curtains, thermal blinds, and reflective film can reduce heat gain, especially on south- and west-facing windows.
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Blackout blinds/curtains
Thermal Blackout Blind or Curtain
Best for: south-facing rooms and bedrooms that overheat before evening
Key features
- Light-blocking fabric
- Thermal lining
- Made-to-measure or temporary options
Approx price
£30-£180 / €35-€210
Pros
- Prevents heat gain
- Improves sleep
- Useful all year
Cons
- Works best if closed before sun hits
- Can make rooms dark
- Fitting may matter
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Reflective window film
Reflective Solar Window Film
Best for: hot windows where curtains are not enough
Key features
- Solar heat rejection
- Cut-to-size sheets
- Removable options available
Approx price
£20-£90 / €25-€110
Pros
- Reduces radiant heat
- Keeps daylight
- Good for loft and balcony doors
Cons
- Can affect window appearance
- Lease rules may apply
- Installation takes patience
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Ventilate at the right time
Open windows when outdoor air is cooler than indoor air, usually late evening, overnight, and early morning. Close windows and blinds before outdoor heat returns.
Use fans where bodies are, not empty rooms
Fans help people feel cooler through air movement. Aim airflow across your body, use a fan near a cooler window at night, and turn fans off in empty rooms unless they are moving cooler air into the home.
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Powerful fan
High-Airflow Circulator Fan
Best for: moving cooler night air and improving comfort without AC
Key features
- Directional airflow
- Several speed settings
- Compact footprint
Approx price
£40-£160 / €45-€180
Pros
- Low running cost
- Works with open windows at night
- No installation
Cons
- Does not lower room temperature
- Can dry eyes
- Limited help during very hot nights
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Reduce indoor heat sources
Avoid oven cooking during peak heat, run dishwashers and laundry later, switch off unused electronics, and use LED lighting. These are small moves, but in a flat with poor ventilation they add up.