London heatwaves always seem to arrive suddenly: one week you’re layering a jumper, the next you’re sleeping under a damp towel and negotiating with a fan that sounds like it’s about to take off. If you’re living in a rental flat, especially one without air conditioning, things can get uncomfortable fast.
Here’s how to stay cool, sleep better, and make your flat bearable when temperatures spike.
1. Master the 'blinds down, windows closed' rule (at the right time)
In the UK, many people accidentally make their flats hotter by trying to air them out during the day.
Once the outside temperature is higher than inside (usually mid-morning onwards in a heatwave), close your windows and blinds. This traps cooler air inside and blocks direct sunlight from turning your flat into a greenhouse.
Then, at night or early morning, open everything wide to create cross-ventilation and flush out the heat.
2. Create a DIY air conditioning effect
If you don’t have AC, you can still fake it:
- Place a bowl of ice or frozen water bottles in front of a fan
- Hang a damp sheet in front of an open window (air passing through cools slightly)
- Freeze a hot water bottle and use it in bed at night
- Keep a spray bottle of cold water in the fridge for quick refreshes
It’s not glamorous, but it works surprisingly well during peak heat.
3. Cool your body, not just your room
When your flat won’t cool down, shift focus to your body temperature:
- Cold showers before bed (even 2-3 minutes helps)
- Run wrists and ankles under cold water
- Sleep with a damp flannel on your neck
- Wear loose cotton or linen, not synthetic fabrics
Your body cools fastest at pulse points, so target those areas.
4. Adjust your sleep setup
Heat makes sleep quality drop dramatically, so your setup matters more than usual:
- Sleep with only a thin sheet (ditch duvets completely)
- Use breathable fabrics like cotton or bamboo
- Move your mattress slightly off the wall if it traps heat
- If possible, sleep on the lowest floor level of your flat (heat rises)
If you’re really struggling, sometimes the floor is cooler than the bed.
5. Change how you cook and eat
Cooking indoors can raise your flat temperature by several degrees.
During a heatwave:
- Avoid ovens and long stove cooking
- Opt for salads, wraps, cold pasta, fruit, yoghurt bowls
- Use a microwave or eat out where possible
- Keep hydrated with water, electrolytes, and iced herbal teas
Even a 15-minute oven session can undo an evening’s cooling efforts.
6. Use your flat’s airflow wisely
If you only have windows on one side, you won’t get natural cross-breeze, but you can still improve airflow:
- Place a fan facing outward in one window to push hot air out
- Open another window on the opposite side (or door if safe)
- Keep internal doors open to circulate air between rooms
- Position yourself in the air path rather than still corners
Small changes in airflow direction can make a noticeable difference.
7. Escape the heat strategically
Sometimes the best solution is simply leaving the flat for a few hours:
- Libraries (often beautifully cool and quiet)
- Shopping centres
- Cinemas
- Shaded parks early morning or late evening
- Air-conditioned cafés
If you’re working remotely, consider relocating for the afternoon rather than fighting peak heat indoors.
8. Make sure your rental setup is working for you
Heatwaves often highlight issues like poor insulation, lack of blinds, or windows that don’t open properly.
If you’re renting through a property management company such as Interlet International, it’s worth asking whether:
- Thermal blinds can be installed
- Window restrictors still allow safe ventilation
- Fans or portable cooling units can be provided
- Maintenance issues affecting airflow can be fixed
Good property management should help make seasonal extremes more manageable, not just reactive.
Final thought
London heatwaves are usually short, but they can feel intense, especially in flats that aren’t designed for extreme temperatures. The key is combining small behavioural changes with smarter airflow, better sleep setups, and knowing when to leave the flat altogether.
With a few adjustments, even the hottest week in the city becomes manageable, and at least slightly less sweaty.
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