Global health has spent many decades learning to control temperature. Vaccines, medicines, blood and diagnostic materials move within prescribed limits. Equipment is tested, temperatures are logged, backup power is arranged and any break in the chain is investigated.
This is the cooling paradox. Temperature control is part of essential infrastructure when a medical product is at risk. When people themselves face dangerous heat, responsibility is divided among personal advice, household budgets, employers, landlords, electricity providers and local government. The medicine enters a system. The human body is largely left to cope.
Heat has always been a matter of life and death in the tropics. Yet the supposed natural tolerance of the people living there helped keep thermal protection low on the global health agenda.
A growing field of critical research on temperature starts from a simple observation: temperatures are measured, but thermal environments are made. A room stays cool because someone designed, financed and powered it. A product remains within a safe range because an institution has decided that its temperature matters. Cooling shows what must be preserved, which activities should continue uninterrupted and whose exposure is accepted as ordinary.
The politics of cooling is easy to see in the history of colonial rule. Across tropical colonies, European settlers and administrators tried to reproduce familiar ways of eating, working and living. Hawai‘i is one well-documented case. Imported ice and later mechanical refrigeration helped reorganise daily life around white settlement, consumption and profit. Cold drinks, refrigerated food and tempered interiors came to represent civilisation and progress.
White bodies were often portrayed as vulnerable to tropical heat and therefore deserving of protection. Indigenous and colonised bodies were assumed to be naturally suited to the climate, available for outdoor labour or insufficiently disciplined. Settler preferences gradually acquired the status of normality. The surrounding climate and the people already living in it were expected to adjust. Cooling did not create colonial power. It just helped colonial power stay put.
This hierarchy did not disappear with colonial rule. Its traces remain in the distinction between bodies protected from heat and bodies expected to cope with it. The racial language is less explicit today, but the geography remains recognisable.
Affluent people move through chains of heat protected interiors: home, car, office, airport, hotel, hospital and shopping centre. They encounter the heat briefly, between doors. Other people build, clean, supply and guard those spaces, often while working outside them.
Thermal inequality extends far beyond ownership of an air conditioner. It is built into the division between protected interiors and exposed bodies.
As refrigeration spread, another form of thermal protection took shape. Food could travel farther. Blood could be stored. Vaccines, organs and biological samples could remain usable beyond the limits that had once governed them. Artificial cold kept organic matter mobile, available and valuable. Researchers have described this as the rise of “cryogenic life”.
Global health is part of this refrigerated order. Cold chains allow sensitive products to cross continents and reach remote communities without losing their safety or effectiveness. They are among the field’s great logistical achievements.
But such institutional concern can stop abruptly at the container door. A pharmacy refrigerator may have backup electricity while the waiting room has poor ventilation. Blood products may be stored at the correct temperature while patients recover in an overheated ward. Medical equipment may be protected from thermal damage more carefully than the staff operating it.
We do not know how many hospitals can keep patient-care areas safely cool. WHO reports global data on electricity in health facilities, but not on whether wards, waiting rooms and staff areas remain within safe temperatures during extreme heat.
Electricity gives a rough indication of where mechanical cooling is even possible. In sub-Saharan Africa, only 40 per cent of health facilities and half of hospitals have reliable electricity, while 15 per cent of facilities have none. Across low- and lower-middle income countries, close to one billion people are served by facilities with unreliable power or no electricity at all. Power does not guarantee a cool ward. But without it, reliable mechanical cooling is impossible.
The temperatures experienced by patients and staff remain largely outside routine measures of health-system readiness. WHO advises people during hot weather to spend two or three hours a day in a cool place. It also recommends shade, reduced exertion, night-time ventilation and ways of keeping the body cool. These measures can save lives.
The phrase “a cool place” carries a great deal of weight.
A poorly insulated top-floor flat or metal-roofed dwelling can stay dangerously hot long after sunset. Opening windows may offer little relief or bring pollution, mosquitoes, noise and safety concerns. A library, shopping centre or cooling centre may be too far away, difficult to reach or closed when the heat is at its worst.
Avoiding exertion is equally difficult when physical work pays the rent. Agricultural workers, construction workers, street vendors, cleaners and delivery riders cannot readily rearrange their day around the weather. Those facing the greatest exposure often have the least control over where and when they work. Public-health advice can assume the infrastructure whose absence creates the danger.
WHO’s recent guidance on heat–health action plans goes further. It calls for defined leadership, financing, warning systems, resilient health services and measures to reduce exposure. Heat protection begins to look like organised public action rather than a collection of tips. Even so, no common expectation defines how much thermal protection people should receive, who must provide it or how the cost should be shared.
The idea of systemic cooling poverty moves attention away from appliances alone. A household may own an air conditioner and still be unable to use it. A tenant may pay the electricity bill but have no authority to shade or insulate the building. A worker may return to a cool home after ten hours in dangerous heat. A neighbourhood may contain air-conditioned shops and hotels while offering no accessible public refuge.
Poor housing, unreliable power, exposed work and the absence of public cool spaces are usually assigned to different policy sectors. Together they form a political economy of cooling. Cooling follows purchasing power, ownership and economic value more readily than physiological danger.
The supermarket is cooled because food must remain saleable. The data centre is cooled because servers must keep running. The office is cooled because heat threatens productivity.
But the patient is simply told to drink more water.
Heat becomes harder to ignore when it disrupts the cooled world. Until then, it is easily treated as a local condition, a failure of adaptation or simply the weather.
Markets already treat cooling as infrastructure when goods, customers or revenue are at risk. It becomes a private expense when the beneficiary has limited means.
Housing owners decide whether roofs are reflective, windows are shaded and buildings are insulated. Tenants live with the result and often pay the energy costs. An owner has little incentive to retrofit a building when overheating harms the occupant and the resulting health costs fall on families and public services.
Workplaces reveal a similar pattern. Employees with secure contracts may alter their hours, work remotely or leave an unsafe building. Informal and precarious workers have fewer options. Their supposed tolerance of heat becomes part of what they are expected to provide.
Electricity ties these inequalities together. Cooling equipment may be privately owned, but its usefulness depends on tariffs, grid reliability and public investment. Wealthier households can buy efficient appliances, batteries, generators and better buildings. Poorer households face a bill that combines the price of staying cool with the poor quality of a dwelling they may neither own nor control.
A political economy of cooling asks who owns the building, who pays for power, who controls working time, who can enter protected space and who carries the environmental cost. Cooling is already governed. Human need simply has less influence over its distribution than property, commerce and institutional continuity.
There is no doubt that mechanical cooling will have to expand. Air conditioning saves lives during severe heat and remains indispensable in many clinical settings.
But a safer thermal environment starts much earlier. Cooling can be built into a pale roof, a shaded courtyard or a street lined with trees. It can also be built into a school timetable or a labour contract. Reflective materials can keep roofs and walls from absorbing heat during the day. Cross-ventilation can release it at night. Public buildings can remain open when homes become unsafe.
WHO’s healthy housing guidance places cooling systems alongside insulation, ventilation, shading, reflective surfaces and green urban design. Often, the most effective cooling is the heat that never enters the building.
Many societies developed architecture and daily routines suited to local climates long before mechanical air conditioning. Some of that knowledge was pushed aside by imported designs: glass façades, sealed offices, dark roofs and concrete landscapes that absorb heat and then require machinery to remove it.
A fixed indoor temperature imposed everywhere would revive the old habit of treating the thermal preference of the powerful as a universal norm. Comfort varies. Preventable thermal harm offers firmer ground for public policy.
Cooling remains a downstream response. It deals with heat after the exposure has been produced. As adaptation, it is indispensable. It cannot carry the entire response to a warming climate.
UNEP projects that cooling demand could more than triple by 2050 under current trends, raising annual cooling-related emissions to 7.2 billion tonnes of carbon dioxide equivalent. That would exceed the current annual emissions of the United States and equal roughly one-eighth of present global greenhouse-gas emissions.
Those numbers must not be used to ration cooling for poorer populations. Wealthy societies have spent decades cooling homes, offices, vehicles, hotels and shops. Ecological restraint cannot begin only when those facing the greatest exposure seek the same protection.
Better buildings, efficient equipment, cleaner electricity and safer refrigerants can reduce the cost of the cooling that remains necessary. Every avoided degree of warming also reduces future demand. Public health has a stake in both: protection from the heat already here and fewer people exposed to worse heat in the years ahead. UNEP estimates that a sustainable cooling pathway could cut projected sectoral emissions by almost two-thirds, with much deeper reductions possible as electricity generation is decarbonised.
A minimum thermal protection floor would allow for differences in climate, humidity, health, activity and local ways of living. The expectation is modest: poverty, tenancy, employment or illness should not force anyone to remain in preventably dangerous heat.
Health facilities would monitor temperatures in wards and waiting rooms, rather than limiting thermal surveillance to refrigerators. Backup electricity would protect patients and staff as well as medical supplies. Schools would keep rooms safe during heat instead of closing and sending children back to hotter homes. Workers would have enforceable access to water, shade, rest and adjusted hours without losing income.
Public cooling spaces would open when people need them and be reachable by those most at risk. Housing policy would address overheating before residents were instructed to change their behaviour. Electricity support would recognise essential cooling as a health need. Urban planning would treat shade, trees and water as infrastructure rather than decoration.
Health ministries cannot deliver all of this alone. Public health has always depended on decisions made elsewhere. Clean water, sanitation, road safety and air quality became health priorities because the damage could no longer be separated from the systems producing it. Cooling now belongs in the same conversation.
Cold chains work because temperature limits are defined, responsibility is assigned, infrastructure is financed and failure has consequences. Global health already knows how to govern temperature.
The cooling paradox is that its strongest protections still end at the insulated box.
Further reading
Critical Temperature Studies: Konturen eines Forschungsprogramms. A broad introduction to temperature as a social and political field, including work on colonial cooling, room temperature and cryogenic life – unfortunately in German.
Cooling the Tropics: Ice, Indigeneity, and Hawaiian Refreshment. A history of ice, race, settlement and thermal power in Hawai‘i.
“Understanding Systemic Cooling Poverty” and “A Multidimensional Assessment of Systemic Cooling Poverty in the Global South”. The conceptual framework and its recent empirical extension.
“People-centered cooling: protecting health against hazardous heat, from the person to the planet”. A layered approach spanning the body, dwelling, building, city and wider environment.