Indoor heat depends partly on surrounding streets, shade, soil, and buildings. Municipalities should assess buildings and public spaces together and follow a clear sequence: reduce exposure, use passive and natural cooling, then provide efficient mechanical cooling where health requires it. Measures can include external shutters, night ventilation, thermal mass, shade structures, permeable surfaces, water-sensitive planting, and solar canopies over car parks and transport facilities. France’s solar-canopy requirements for large car parks provide one precedent for making exposed surfaces provide shade and electricity. Renovation and public-space programmes can prioritise the hottest and least-protected neighbourhoods. Paris OASIS schoolyards and Barcelona’s trees and climate shelters demonstrate parts of this model, while WRI’s Cool Cities Lab supports comparison by location. Modelling across 93 European cities estimated that increasing tree cover to 30% could lower average urban temperatures by 0.4°C and prevent about 2,644 premature deaths annually; this is a modelled result rather than a universal target. Plans should address maintenance, water use, allergens, fire, and displacement, and measure indoor and outdoor exposure, cooling demand, and effects on current residents.

Sealed and degraded land loses water and cooling capacity. Rain runs off quickly, vegetation dries, and intense downpours can cause erosion, pollution and flooding without restoring groundwater. Basin, land, and urban authorities can combine de-paving, restored urban soils, rain gardens, bioswales, small wetlands, reconnected floodplains, and riparian corridors with street renewal, public estates, housing investment, and land-management funding. Wrocław shows how planting, de-paving and rainwater management can become continuing municipal practice rather than a one-off project. Authorities should prioritise places where heat, drought, fire, and flood benefits overlap and assess existing water, restoration, and regional-development instruments before creating a new programme. The EU’s nature-based adaptation policy provides one foundation. Each intervention needs a local hydrological assessment because vegetation can increase water demand, fire load or allergens, upstream retention can alter downstream flows, and land-use changes can shift costs to farmers or tenants. Results should include permeability, soil moisture, vegetation health, surface temperature, and the share of rainfall retained locally while maintaining ecological flows and fair access.

Southern Europe has longstanding knowledge of courtyards, shade, water, ventilation, and climate-responsive construction, alongside current experience of heat, drought, and wildfire. A network of centres of excellence could document vernacular and contemporary methods, test solutions under real climatic conditions, train architects, engineers, planners, public-health professionals and public officials, connect design practice with health evidence, and develop common standards and open specifications. The centres could transfer tested methods to Northern and Central Europe, build partnerships with neighbouring countries and WHO, and help European practitioners develop services for international cooperation. Their performance should be measured through trained practitioners, adopted specifications, completed projects, lower delivery costs, and verified reductions in heat exposure.

Forecasts, local vulnerability and service capacity should inform protocols calibrated to climate, indoor conditions, humidity, solar radiation, workload, and individual vulnerability. A shared heat and vulnerability atlas could combine daytime and nighttime temperatures, humidity, radiation, wind, tree canopy, soil and vegetation cooling capacity, housing and building characteristics, occupational exposure, health and demographic vulnerability, access to healthcare and cool spaces, and the capacity of places to regulate heat naturally. European reference levels could support consistency while allowing national and regional calibration. Before summer, health and meteorological agencies, municipalities, employers, care providers, and operators should agree who changes work, checks high-risk residents, adjusts staffing, protects infrastructure, opens refuges, and requests assistance at each warning level. European cooperation can support compatible data and shared learning while retaining national and local systems. Research on heat warnings and mortality links effective warnings to organised public-health measures. Reviews after each event should assess completed actions, population coverage, and protection outcomes, while checking whether frequent alerts, poorly calibrated thresholds or digital communication excluded people.

Separate continuity plans may depend on the same electricity, water, digital systems, transport routes, workers or suppliers. Tests should cover prolonged hot days and nights, simultaneous heat and drought, wildfire and smoke, electricity or water disruption, rising hospital demand, reduced workforce availability, and transport or supply-chain failure. Assessments should include health and care, electricity, water, agriculture and food supply, tourism and hospitality, construction, logistics, outdoor work, and emergency services, and determine whether each can maintain an agreed minimum service. Regulators can add a common heat scenario to existing exercises. Asset owners, municipalities, employers and civil-protection authorities would identify shared dependencies, minimum service levels, and restoration priorities, while national regulators and operators retain responsibility for corrective investment. Exercises can create false assurance if findings remain open. Sensitive information needs protection, and one sector’s plan may claim power, water or staff needed elsewhere. Results should report completed corrective actions, improved service margins and resolved conflicts over scarce resources.

Local capacity can be overwhelmed while revenue falls and emergency costs rise. Finance should cover rapid support during dangerous heat and sustained investment in safer buildings, neighbourhoods, care, and local delivery. EU and national funders should map gaps, set transparent triggers, and decide which existing instruments can provide temporary drinking water, extra health and care staff, extended refuge hours, outreach, temporary energy and water capacity, cross-border equipment and personnel, and urgent protection of essential infrastructure. Civil-protection cooperation provides a precedent for shared operational capacity. Future EU budgets should preserve rapid response and long-term investment regardless of programme names. Allocation rules should not favour places with stronger grant-writing capacity or support cooling that worsens energy stress. Performance should be measured through response time, people reached, lower exposure, continuity of essential services, and fewer repeated losses.

A protection floor could require workplace heat-risk assessments, sector-specific heat-action plans, water, shade, cooled recovery areas, work-rest schedules, safer hours, acclimatisation, training to recognise heat illness, reporting of occupational heat illness and deaths, and the right to stop work in serious danger. Care settings also need indoor and nighttime temperature monitoring, safe rooms, hydration and medication protocols, adequate staffing, backup power and water, emergency transfer procedures, and continuity plans for home care. Member States and providers can close operational gaps under current rules while any European measure is assessed. Social partners can compare national requirements, and employers and care providers can adopt plans linked to warning levels. Article 153 TFEU may provide a route for minimum worker health and safety requirements, but the legal basis and form of any heat-specific EU measure require review. Protection should preserve income and continuity of care, account for humidity, radiation, workload, and clothing, and avoid fixed thresholds that do not fit the task or climate.

Climate refuges should form part of a wider city heat plan that connects neighbourhood cooling, housing and public-building measures, warning protocols, occupational and public-health protection, infrastructure preparedness, social outreach, safe transport routes, and emergency response. Libraries, schools, museums, community centres and places of worship can form a recurring seasonal network with common signage, public maps, accessible routes, and minimum standards for indoor conditions, drinking water, staffing, referral, and opening hours tied to warning levels. Before summer, municipalities should identify neighbourhood gaps, coordinate outreach to isolated residents and people experiencing homelessness, and run an exercise; a post-summer review should record who was reached and what failed. Barcelona, Berlin’s Kühle Kirchen, and Warsaw’s Cool Spots provide different delivery models. Cities should measure safe capacity, travel time, accessibility, use by high-risk groups, and connection to health, social and transport services.