If you need relief this week
A portable air conditioner is usually the fastest real cooling option. It is not elegant, cheap, or silent, but it can lower the temperature in one closed room when fans are only pushing warm air around.
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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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If you rent
Focus on changes you can reverse: portable AC, window seals, blackout curtains, reflective film that your tenancy allows, and smarter night ventilation. Ask before drilling, mounting outdoor units, or changing glass.
Good for
- top-floor flats
- short tenancies
- people who cannot get landlord approval
Not good for
- whole-home cooling
- silent bedrooms
- open-plan spaces with many sunny windows
If you own and want a proper system
A split air conditioner or air-to-air heat pump is the serious upgrade. It costs more upfront, but the indoor unit is quieter, the cooling is steadier, and efficiency is usually far better than a portable unit.
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Air-to-air heat pump information card
Air-to-Air Heat Pump / Mini-Split
Best for: owners who want efficient cooling and shoulder-season heating
Key features
- Outdoor unit plus indoor head
- High efficiency cooling
- Can provide heating
Approx price
Often £1,500-£4,000+ / €1,800-€5,000+ installed
Pros
- Quiet indoor cooling
- Much more efficient than portable AC
- A long-term home upgrade
Cons
- Needs permission and installation
- Outdoor unit placement matters
- Higher upfront cost
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If your budget is tight
Block sun before it enters, ventilate when outdoor air is cooler, reduce indoor heat sources, and use fans directly on people rather than empty rooms. These steps will not perform miracles in a heatwave, but they often decide whether a room is uncomfortable or unusable.
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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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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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