Stop the room heating up during the day
Close blinds before direct sun hits the glass, keep doors shut if nearby rooms are hotter, and reduce electronics. In loft rooms, roof windows and poor insulation can turn the room into a heat store.
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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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Use cooler night air properly
Open windows only when outdoor air is cooler than indoor air. Use a fan to move air across the room or exhaust warm air out of a window. Close everything again in the morning before the sun restarts the cycle.
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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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When to use portable AC
If sleep is the priority, a portable AC can be worth it for the bedroom alone. Start cooling before bedtime, seal the hose properly, and accept that the unit may be too loud for continuous overnight use.
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Portable air conditioner
Compact Portable Air Conditioner
Best for: bedrooms, home offices, and short heatwaves
Key features
- Exhaust hose for a window
- Sleep or quiet mode
- Timer and remote control
Approx price
£250-£550 / €300-€650
Pros
- Fastest renter-friendly cooling
- Can move between rooms
- No permanent installation
Cons
- Needs a window seal
- Noisy compared with split AC
- Uses more electricity than a fan
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Window sealing kit
Universal Window Sealing Kit
Best for: making a portable AC work properly
Key features
- Zip opening for exhaust hose
- Adhesive or fabric mounting
- Fits many casement windows
Approx price
£15-£45 / €18-€55
Pros
- Cheap upgrade
- Stops hot air leaking back in
- Usually renter-friendly
Cons
- Can look messy
- May not fit unusual windows
- Adhesive can fail in strong sun
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Loft rooms need extra realism
A loft room with sun-exposed roof surfaces can overwhelm small cooling fixes. If you own the home, insulation, external shading, or a split system may be the long-term answer.