A city can be full of buildings and still have nowhere safe to go when the heat becomes dangerous.
Extreme heat is different from many urban hazards because it can arrive without visible destruction. Roads remain open. Buildings remain standing. Shops may still trade. Yet the human body, the power system, transport, hospitals, schools and outdoor work can all begin to fail at the same time.
This is why heat planning needs more than trees, cool roofs or air-conditioning. It needs a refuge network: a connected system of cooling centres, shaded routes, early warnings, water access, resilient public buildings, transport links and outreach that helps people reach safety before heat becomes a medical emergency.
Heat planning is especially current in 2026. WHO released new Heat–Health Action Plan guidance in June 2026. UNEP launched its 50@50 urban heat initiative in June and continued its Beat the Heat work through July. C40’s Cool Cities Accelerator now explicitly treats cooling centres, early warning and cool corridors as core city responsibilities. The search interest surrounding “cooling centers,” “heat action plan,” “urban heat” and “cool cities” mirrors a real policy shift: heat is becoming an everyday planning problem rather than a seasonal emergency footnote.
A cooling centre is only useful if people can reach it
Opening an air-conditioned hall is not enough.
The building may be too far away. The route may be unshaded. Bus service may stop early. The entrance may be inaccessible. A resident may not know the centre exists. Someone who is elderly or unwell may be unable to travel alone.
The refuge network therefore begins with access.
How long does it take to reach a safe cool place on foot, by transit or with assisted transport? Which neighbourhoods contain people most vulnerable to heat? Which buildings are open in the evening and on weekends? Where do routes cross large exposed roads or plazas?
The planning unit is not the building. It is the journey from heat exposure to relief.
Heat risk is spatially unequal
Two neighbourhoods in the same city can experience very different heat.
Tree canopy, roof colour, building density, paving, wind, traffic, industrial activity and access to air-conditioning all change thermal exposure.
Household vulnerability also differs.
Older adults, infants, people with chronic disease, outdoor workers, low-income households, people experiencing homelessness and residents of poorly ventilated housing can face greater risk.
WHO’s 2026 guidance repeatedly emphasizes that heat action should identify vulnerable populations rather than treating every resident as equally exposed.
A heat-refuge map should therefore combine temperature with vulnerability and access.
The hottest place is not always the highest-priority place
A commercial district may record the highest daytime surface temperature while having many cooled interiors and few residents.
A slightly cooler residential district may contain elderly people living alone in poorly insulated apartments with no affordable cooling.
Heat planning therefore needs a risk equation:
Heat risk = hazard × exposure × vulnerability ÷ adaptive capacity.
This is not a literal universal formula. It is a planning discipline.
Temperature alone tells the town where it is hot. The rest tells the town where heat is likely to cause harm.
Cooling centres need a service standard
A refuge building needs more than air-conditioning.
It needs opening hours that match heat risk, drinking water, toilets, seating, accessibility, staff, communications and enough capacity for the expected population.
Some centres may need medical support. Others may need spaces for families, older adults or people with pets. Overnight respite may be necessary when nighttime temperatures remain dangerous.
Phoenix’s recent expansion toward 24/7 heat respite is instructive because it recognizes that a cooling system with business-hour gaps can fail precisely when heat exposure continues.
The key planning question is continuity.
Public buildings can become dual-purpose infrastructure
Libraries, community centres, schools, sports halls, transport hubs and civic buildings already exist across many towns.
Heat planning can give them an emergency role.
This is efficient because the city does not need a separate building for every hazard.
But dual use requires preparation.
Can the cooling system handle extended operation? Is backup power available? Are staff trained? Can the building stay open beyond normal hours? Is emergency signage ready? Does the building itself overheat during a power outage?
A refuge building should be designed as infrastructure, not improvised during the heatwave.
Power resilience is part of heat resilience
Extreme heat increases electricity demand because cooling loads rise.
That is exactly when power failure becomes most dangerous.
A cooling centre without electricity can become unusable. Lifts fail. Ventilation stops. Medical devices may be affected. Traffic systems can degrade.
Critical refuge sites therefore need backup power, protected fuel or battery storage, resilient electrical equipment and load prioritization.
The strongest network also avoids putting every refuge site on the same vulnerable feeder or substation.
Redundancy matters because heat can stress the exact system on which relief depends.
The shaded route matters as much as the cool destination
A person can become dangerously overheated walking to a cooling centre.
Shade therefore becomes movement infrastructure.
Trees, arcades, canopies, covered walkways, awnings and building shadows can reduce exposure along important routes.
Heat planners should map not only centres, but the paths connecting homes, transit stops, clinics and refuge sites.
A high-priority cool corridor may be more valuable than adding another isolated pocket of greenery.
Green–Blue Infrastructure owns the broader landscape network. The Heat Refuge Network owns the emergency-access job.
Shade should be measured at the time people need it
A street can look leafy and still offer little shade at 3 p.m.
Canopy percentage is useful, but heat comfort depends on where shadows fall during the hottest hours.
Planning can therefore use time-based shade mapping.
Which bus stops are exposed at midday? Which school routes are shaded in the afternoon? Which plazas become heat traps?
The thermal map should be dynamic because heat exposure is dynamic.
Heat alerts should trigger spatial actions
An early warning system is useful only when it changes behaviour.
A heat alert can trigger longer cooling-centre hours, outreach to vulnerable residents, free or discounted transport, temporary water stations, outdoor-work restrictions, extra medical staffing and opening of shaded public facilities.
The city should decide these triggers before the heat arrives.
WHO’s 2026 Heat–Health Action Plan guidance emphasizes exactly this type of systematic preparedness.
The warning is the signal. The refuge network is the physical response.
Communication has to reach people outside digital systems
An app notification will not reach everyone.
Older residents may not use smartphones. Tourists may not understand local alerts. Homeless people may have no reliable device. Migrant workers may need information in multiple languages.
Heat communication therefore needs several channels.
SMS, radio, transit displays, community organizations, health workers, libraries, neighbourhood groups and employers can all contribute.
The communication system should answer practical questions: where can I go, how long is it open, how do I get there, what should I bring, and what symptoms mean I need medical help?
Cooling access is partly an affordability problem
A household can have an air-conditioner and still be heat-vulnerable if electricity is unaffordable.
Energy poverty changes how people use cooling.
Residents may ration cooling, use one room only or avoid turning systems on until indoor temperatures become dangerous.
Heat policy may therefore require bill assistance, efficiency upgrades, targeted retrofit programmes or public cooling access.
The point is not to make every home mechanically cooled at all times.
It is to make safe indoor temperature achievable without forcing households into financial distress.
Housing design decides how long a home stays safe
Passive design can delay dangerous indoor heat.
Insulation, shading, ventilation, roof reflectance, orientation and window design all influence indoor temperatures.
This matters because the refuge network should not become an excuse to leave housing thermally unsafe.
The strongest heat strategy reduces the number of people who need emergency refuge while maintaining safe places for the people who still do.
TPW-0047 — The Climate Code owns the regulatory building layer.
Nighttime heat changes operating hours
Heat risk does not end at sunset.
High nighttime temperatures prevent the body from recovering and can keep indoor spaces dangerously warm.
A city whose cooling centres close at 6 p.m. can therefore have a serious service gap.
Heat plans should use actual temperature patterns rather than office hours to determine when refuge is available.
Nighttime transport and security become part of the network.
Outdoor workers need a different refuge system
Construction workers, delivery riders, street vendors, maintenance crews and other outdoor workers cannot always reach a formal cooling centre during a shift.
They need distributed relief.
Shade, drinking water, rest breaks, cooled break rooms and work scheduling can reduce exposure.
Planning and labour regulation intersect here.
A heat-resilient city protects people while they move and work, not only after they leave work.
Transit stops can become heat traps
Public transport reduces car dependence, but waiting for transit in extreme heat can create exposure.
Shade, seating, water access, ventilation and shorter waiting times matter.
Transport agencies can prioritize shelters at high-ridership and high-vulnerability stops.
During severe heat, fare policy or special shuttle services can help vulnerable residents reach cooling centres.
The refuge network therefore overlaps with transport operations without becoming a transport article.
Hospitals are both refuge and vulnerable infrastructure
Hospitals receive heat-related patients while facing the same heat stress as the rest of the city.
WHO’s July 2026 work on planning for a warmer world highlights the risk that urban heat can affect hospitals, including power, cooling and IT services.
Health facilities therefore need their own resilience plans.
Backup power, cooling redundancy, shaded arrival areas, safe staff conditions and overflow protocols can all matter.
A heat refuge network that depends on hospitals for ordinary cooling demand can overload the medical system. Community cooling should keep people safe before medical care is necessary.
The city needs a thermal service map
Most towns already map roads, parks and schools.
Heat resilience suggests another layer.
The thermal service map can show:
- high-heat blocks;
- vulnerable populations;
- cooling centres and operating hours;
- shaded walking routes;
- water points;
- air-conditioned public facilities;
- heat-resilient transit stops;
- backup-power sites;
- health facilities;
- areas with low tree canopy;
- housing known to overheat.
This map helps the city see the refuge system as one network rather than disconnected programmes.
Cooling centres need capacity planning
A city may list dozens of refuge sites and still have too little capacity in the highest-risk districts.
Planning should estimate how many people could realistically need refuge, how far they will travel, and which sites remain operational during simultaneous demand.
Capacity should include more than floor area.
Toilets, drinking water, electrical load, staffing and seating can become bottlenecks.
Sites should be stress-tested before the hottest week of the year.
Heat refuge should be normal enough to use
People may hesitate to enter a facility that feels like an emergency shelter.
Libraries, community centres and malls can be easier because they already function as ordinary public places.
Heat resilience benefits from dignity.
A resident should not need to declare a crisis before sitting somewhere cool and safe.
This social design matters as much as the thermostat.
Temporary cooling can fill network gaps
Pop-up shade, misting stations, temporary cooling tents and mobile services can extend coverage during exceptional heat.
They are useful where permanent facilities are distant or events create temporary crowds.
Temporary systems should not substitute for durable infrastructure in chronically hot areas.
The planning principle is the same as elsewhere: temporary infrastructure should fill a known gap, not conceal a permanent one.
Heat planning must include maintenance
Shade structures fail. Drinking fountains break. Trees die. Cooling equipment loses efficiency.
A heat-refuge network is therefore an operating system, not a one-time capital programme.
The city needs budgets for maintenance, replacement and testing.
The most dangerous failure is a refuge site that exists on the map and does not work when people arrive.
The Heat Refuge Network and the wider Town Planning series
The Healthy Town owns the broad urban-health relationship. The Shock Map owns multi-hazard resilience. The Climate Code owns recurring regulation.
The Heat Refuge Network has a different reader job: how does a city physically move vulnerable people from dangerous heat into reliable relief during the hours that matter most?
A heat-refuge audit
- Risk: Where are the hottest and most vulnerable blocks?
- Access: How long does it take vulnerable residents to reach cooling?
- Hours: Do refuge sites remain open during nights, weekends and prolonged heat?
- Capacity: Can sites support expected demand?
- Power: Which sites have backup electricity and cooling redundancy?
- Routes: Are important walking and transit routes shaded?
- Water: Are drinking-water points available?
- Communication: Can alerts reach people without smartphones?
- Transport: Can people without cars reach refuge?
- Housing: Which buildings repeatedly overheat?
- Workers: Where do outdoor workers receive rest and cooling?
- Maintenance: Who tests and repairs the system before heat season?
A cool city is not just a city with lower average temperature
A city can remain hot and still become much safer.
Heat resilience depends on whether people can avoid dangerous exposure, recover at night, reach help, keep essential services functioning and access cooling without financial or physical barriers.
The long-term plan should cool the urban environment.
The refuge network protects people while that slower transformation happens.
Town planning works when safety does not depend on owning the right apartment, the right car or the right air-conditioner.