Action first
Why is my bedroom still hot at night?
Short answer
The roof, walls and furniture may be releasing heat stored during the day, while weak airflow prevents that heat escaping.
What to do
- ✓Keep the next day’s heat out early.
- ✓Ventilate when outside is cooler.
- ✓Create an exit path for warm air.
- ✓Check loft, roof and window shading for persistent problems.
Why it works
This advice follows UK Health Security Agency guidance and the underlying principles of thermal mass and night ventilation.
Important exceptions
Safety, health, weather and the design of your home can change what is appropriate. Stop if an action makes conditions worse.
Related guides
Sources & evidence
Reviewed 2026-08-21
- UK Health Security Agency: Beat the heat: keep cool at home checklist ↗
Supports: Shading, ventilation, reducing indoor heat and protecting people at higher risk.
official guidance · Accessed 2026-08-21