The UK is experiencing intensifying heatwaves that are forcing a reassessment of how homes and public buildings cope with rising temperatures. Residents in solid brick housing, particularly in urban areas affected by the heat island effect, struggle as buildings designed to retain warmth become unbearably hot at night. The urban heat island effect can push nighttime temperatures up to 7 degrees Celsius higher than surrounding countryside, contributing to heat-related deaths and health complications for vulnerable populations.
This situation has prompted a broader policy debate about resource allocation. For decades, wealthy nations have prioritized climate change mitigation—reducing carbon emissions—over adaptation measures such as air conditioning installation or heat-resistant building design. In 2023, mitigation received approximately $1.8 trillion in funding globally, while adaptation received only $65 billion. Bill Gates has argued that this imbalance is problematic, suggesting governments should invest more in cooling solutions that directly improve lives in a warming world, though this sparked debate among climate scientists about whether adaptation and mitigation are competing priorities.
Baroness Julia Brown, chair of the UK’s Climate Change Committee adaptation committee, has advocated for stronger legal requirements on adaptation measures, mirroring the binding carbon budget targets that exist for mitigation. A recent committee report recommends installing air conditioning in hospitals and care homes within ten years and schools within twenty-five years. Currently, only about 5 percent of English homes have cooling units. However, this recommendation conflicts with previous government advice favoring passive cooling methods such as ventilation and reflective roofing.
Experts remain divided. Professor Mat Santamouris, a leading researcher on urban overheating, argues that air conditioning should be a last resort and warns that widespread machine cooling could increase electricity demands, strain grids, and generate additional heat in streets, potentially worsening conditions for those unable to afford cooling systems. David Lawrence counters that Britain’s resistance to air conditioning creates inequality, noting that offices and shops have cooling while hospitals and schools do not.
The financial landscape further complicates matters. England and Wales offer £2,500 subsidies for reversible heat pump systems that provide cooling, yet uptake remains minimal. Crucially, social housing residents are excluded from these grants, even as evidence shows the most deprived neighborhoods face seven times greater heat exposure risk. This creates a thermal divide where wealthier households cool themselves while vulnerable populations remain exposed to dangerous conditions.
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