When heat turns a sidewalk into a griddle, distance becomes a safety issue. Many cities publish lists of libraries, cooling centers, senior centers, splash pads, and shaded public buildings, but a list does not answer the real question: Can someone actually reach help on foot? Today, you can turn scattered “heat refuge” locations into a practical walk-time map that shows who is within 5, 10, or 15 minutes of relief. This guide gives you a clear workflow, plain-language checks, and mapping choices that keep the work useful instead of merely decorative.
Why Heat Refuge Mapping Matters
A heat refuge map is not just a pretty civic layer with blue pins sprinkled across town. It is a small promise: when the air gets dangerous, people should know where they can go and how long it may take to get there.
The CDC warns that extreme heat can cause serious illness, especially for older adults, young children, people with chronic conditions, outdoor workers, unhoused neighbors, and residents without reliable cooling. A paper map on a bulletin board can help, but a walk-time isochrone map answers the sharper question: who is outside a reasonable walk to cooling?
I once helped review a city map where every library looked evenly distributed at first glance. Then we added 10-minute walking areas. One senior apartment building sat just beyond every service area, like a quiet island in a hot parking lot sea. The dot map had smiled. The walk-time map told the truth.
- Dots show where services are.
- Isochrones show who can reach them.
- Equity layers show who may need help first.
Apply in 60 seconds: Pick one neighborhood and ask, “Can a slow walker reach a cooled building in 10 minutes?”
What a walk-time isochrone really means
An isochrone is an area reachable within a set travel time. For heat refuge mapping, that usually means drawing polygons around libraries, cooling centers, community centers, transit hubs, clinics, or other public buildings based on walking time.
Unlike a simple circle, a walk-time isochrone follows streets and paths. It notices the bridge, the missing sidewalk, the highway barrier, the long block, the cul-de-sac that behaves like a polite little trapdoor.
Why straight-line distance can mislead
A quarter-mile circle around a library may look reasonable. But if a rail line, drainage canal, freeway, steep hill, or gated campus blocks the route, the actual walk may be much longer.
In one neighborhood review, a school gym was less than 800 feet from several apartment buildings. The walking route was almost half a mile because the only legal crossing was at the far end of the block. The map did not lie. It simply failed to speak human.
Safety Disclaimer
This article is for general planning and education. It is not medical, emergency management, legal, engineering, or public health advice. Heat can be dangerous quickly, and a map should never replace emergency instructions from local officials.
If someone has symptoms such as confusion, fainting, hot skin, vomiting, severe weakness, or worsening heat illness, seek urgent medical help. A 10-minute walk to a library is not a treatment plan. Sometimes the safest route is a phone call, a ride, a wellness check, or emergency care.
OSHA, CDC, local health departments, and emergency management offices all play different roles in heat safety. A good map supports those efforts. It should not pretend to be the whole orchestra when it is really one careful violin.
Use maps to reduce risk, not to promise safety
Walk-time maps depend on data quality. Sidewalks may be missing. Construction may block a route. A cooling center may close early. A person may use a walker, push a stroller, carry groceries, or avoid a street because it feels unsafe.
For public-facing use, treat your map as a planning aid. Add plain-language notes, update dates, phone numbers, and reminders to check hours before traveling when possible.
Who This Is For / Not For
This guide is for people who need a practical map without building a cartography department in the basement. It fits city staff, public health teams, nonprofit planners, library systems, mutual aid groups, neighborhood associations, emergency managers, student researchers, journalists, and civic tech volunteers.
It is also useful for bloggers and local information publishers who want to explain heat access clearly. A good neighborhood heat refuge guide can help readers move from “Where do I go?” to “Here are my safest nearby options.” That is the difference between a grocery list and a lifeline.
This is for you if...
- You have a list of cooling centers, libraries, or public buildings and want to show walking access.
- You need a map that works for non-technical readers.
- You want to compare neighborhoods fairly.
- You care about older adults, renters, outdoor workers, unhoused residents, transit riders, and people without air conditioning.
- You want to create a print-ready or web-friendly map without turning the project into a 400-page atlas.
This is not for you if...
- You need an official emergency response plan for a declared disaster.
- You are making medical decisions for a specific person during heat illness.
- You need legally certified routing for ADA compliance.
- You cannot verify facility hours, access rules, or contact details.
- You want a one-click magic map that ignores messy streets, heat exposure, and human limits.
Decision Card: Should You Publish the Map Yet?
Publish internally first if your locations are incomplete, hours are uncertain, or routing data needs review.
Publish publicly when every location has a name, address, hours, contact method, accessibility note, and update date.
Do not publish as a safety guide if the map cannot explain closures, heat alerts, or emergency instructions. A beautiful wrong map is still wrong, only better dressed.
Define Heat Refuge Before You Map
Before mapping, define what counts as a heat refuge. This sounds simple until someone adds a splash pad, a mall, a church lobby, a shaded park, a transit station, and one heroic coffee shop with three chairs and a tired ceiling fan.
A heat refuge location should be described by what it offers, who can use it, when it is open, and whether it is appropriate during extreme heat. Not every cool place is a public cooling center. Not every public place is safe for every resident.
Start with refuge categories
Use categories that a reader can understand without decoding government soup. For example:
- Cooling center: Officially designated site for heat relief during alerts.
- Public library: Air-conditioned public building with seating, restrooms, and staff.
- Community or senior center: Public or semi-public facility with programmed hours.
- Transit-accessible refuge: Site near frequent transit service.
- Outdoor shade or water relief: Park shade, splash pad, misting station, or drinking fountain.
- Emergency-only site: Activated during declared heat events.
When I see maps mix indoor cooling centers with shaded benches under one symbol, my coffee gets nervous. These places solve different problems. A shaded bench may help during a mild afternoon. It is not the same as an air-conditioned room during a heat emergency.
Minimum fields for each location
A useful heat refuge dataset should include more than a name and address. If your spreadsheet looks too thin, the map will feel thin too.
| Field | Why it matters | Example |
|---|---|---|
| Facility name | Readers need a recognizable destination. | Eastside Public Library |
| Street address | Needed for geocoding and directions. | 125 Maple Ave |
| Latitude and longitude | Reduces address-matching errors. | 40.7128, -74.0060 |
| Hours | A closed refuge is just a locked box with branding. | Mon-Fri, 9 a.m.-7 p.m. |
| Activation rules | Some sites open only during heat alerts. | Open when heat index exceeds local threshold |
| Accessibility notes | Wheelchair access, ramps, elevators, restrooms, pets, and service animals matter. | Step-free entrance, accessible restroom |
| Phone or webpage | Readers need to verify details. | City hotline or library page |
Short Story: The Library That Was There But Not There
A neighborhood volunteer once brought me a map with one proud blue dot: a library near a cluster of older apartment buildings. On paper, it looked perfect. Close, public, air-conditioned, beloved. Then we called the branch. It was closed on Sundays, and the city’s worst heat warnings that summer had often peaked over long weekends. The dot had been telling a half-truth with excellent posture. We added hours, marked “closed Sunday,” and searched for a second refuge nearby. A small recreation center, usually invisible in the city spreadsheet, became the weekend anchor. The lesson was not glamorous. It was better than glamorous: verify the boring fields. Hours, doors, phone numbers, ramps, restrooms, activation rules. Heat maps are made from geography, but they are trusted because of clerical honesty.
Collect and Clean Location Data
Heat refuge mapping usually begins with a spreadsheet. That spreadsheet may come from a city open data portal, a library system, a county emergency page, a public health department, Google Business Profiles, nonprofit lists, or hand-collected local knowledge.
The trick is to make the data boring in the best possible way. Boring data has consistent names, complete addresses, clear categories, and no mystery fields labeled “misc2.” Mystery fields are where maps go to grow tiny gremlins.
Recommended data sources
- City or county cooling center lists: Best for official public heat response.
- Public library branch data: Often stable and easy to verify.
- Parks and recreation centers: Useful when they provide indoor cooling, water, shade, or splash pads.
- Public health department pages: Helpful for heat alert language and safety notices.
- Transit agency data: Useful for adding bus or rail access context.
- Census or ACS data: Useful for age, income, vehicle access, disability, and housing indicators.
For official health language, the CDC is a strong starting point. For workplace heat exposure, OSHA guidance matters. For urban heat island context, the EPA provides plain explanations that help readers understand why one neighborhood may feel much hotter than another.
Clean before geocoding
Before you geocode addresses, standardize them. Remove duplicate rows. Separate facility name from address. Check ZIP codes. Confirm city names. Keep phone numbers in one format. Add a “last_verified” column.
I once watched a geocoder place a community center in another state because the city name was missing. The dot looked confident. Confidence is not accuracy. Maps can wear a tuxedo while stepping on a rake.
- Verify addresses before geocoding.
- Add hours and activation rules.
- Keep a last-reviewed date for public trust.
Apply in 60 seconds: Add a “last_verified” column to your location spreadsheet right now.
Eligibility checklist: Is a location ready to map?
Eligibility Checklist for Heat Refuge Locations
- Is the location open to the public or clearly available to the intended group?
- Is the address verified?
- Are hours listed for regular days and heat alerts?
- Is there indoor cooling, shaded relief, drinking water, or another clear heat benefit?
- Is there a phone number, webpage, or city contact?
- Are accessibility details known?
- Is there a plan to update the record during summer?
Simple rule: If a resident cannot answer “Can I go there today?” from your data, the record is not ready for public use.
For more mapping structure, you can connect this workflow to accessible map design practices and coordinate system checks. These are not decorative chores. They are the quiet hinges that keep the whole door attached.
Choose Walk-Time Bands That People Can Understand
Walk-time bands should match real decisions. A resident does not think, “I am inside polygon class B.” They think, “Can I get there before I feel worse?”
For heat refuge maps, common bands are 5, 10, and 15 minutes. Some projects add 20 minutes, but be careful. In extreme heat, a 20-minute walk may be unrealistic for older adults, people with mobility limits, children, or anyone crossing sun-baked arterial roads.
Use simple bands first
| Band | Best use | Reader meaning | Caution |
|---|---|---|---|
| 5 minutes | Immediate neighborhood relief | Close enough for many people to consider | Still hard in high heat without shade |
| 10 minutes | Primary service coverage | Reasonable walking access for many adults | May exclude slower walkers |
| 15 minutes | Broader planning gap analysis | Possible but less comfortable | Riskier during dangerous heat |
Adjust walking speed with humility
Many routing tools assume an average walking speed near 3 miles per hour. That may be too optimistic during a heat event. People slow down when carrying bags, walking with kids, using mobility aids, crossing wide roads, or searching for shade.
A practical public health map can include two versions: a standard 10-minute walk and a slow-walk 10-minute map. The gap between them can reveal who is “covered” only under cheerful spreadsheet weather.
Think in heat exposure, not just minutes
A 10-minute shaded walk with safe crossings is different from a 10-minute walk beside six lanes of asphalt and one lonely sapling fighting for its pension. If you have tree canopy, surface temperature, shade, sidewalk, or crash-risk data, add it as context.
This is where a related guide on urban heat islands can support your explanation. Readers often feel the heat pattern before they know the term for it.
Build Isochrones With Real Walking Constraints
Now the map becomes useful. You take your verified heat refuge points and generate walk-time service areas using a street network. The goal is not to produce the fanciest polygon. The goal is to create a trustworthy answer to “How far is help on foot?”
You can build isochrones with tools such as ArcGIS Online, QGIS with routing plugins, OpenRouteService, Mapbox, TravelTime, Felt, CARTO, or local open-source network analysis tools. The right choice depends on budget, skill, data privacy, and publication needs.
Basic workflow
- Prepare a clean heat refuge point layer.
- Choose a walking network or routing provider.
- Set travel mode to walking.
- Create 5-, 10-, and 15-minute isochrone polygons.
- Dissolve overlapping polygons if you want total coverage.
- Keep individual polygons if you want to compare facility reach.
- Overlay population and vulnerability layers.
- Review weird shapes manually.
- Publish with plain-language caveats.
Visual Guide: Heat Refuge Isochrone Workflow
Confirm libraries, cooling centers, hours, access, and contact details.
Use a pedestrian network, not simple distance circles.
Create 5-, 10-, and 15-minute walking areas.
Overlay age, income, car access, tree canopy, and heat burden.
Review barriers, missing sidewalks, closures, and unsafe crossings.
Use readable labels, update dates, and safety notes.
Tool comparison table
| Tool type | Good for | Watch out for |
|---|---|---|
| Web GIS platform | City teams, dashboards, hosted sharing | Credits, licensing, routing limits |
| QGIS plus routing service | Analysts who want control and low software cost | Setup time, API keys, learning curve |
| Developer API | Automated updates and custom apps | Engineering support, cost, privacy review |
| Manual public map builder | Simple community maps and prototypes | May not support true network isochrones |
Cost table for planning
| Cost item | Low-cost approach | Paid approach |
|---|---|---|
| Software | QGIS, public data portals | Hosted GIS or routing platform |
| Routing | OpenStreetMap-based services with free tiers | Commercial routing API with support |
| Data cleaning | Staff spreadsheet review | Consultant or data QA vendor |
| Publishing | Static image, PDF, simple embed | Interactive dashboard with filters |
How to handle overlapping service areas
If multiple cooling centers overlap, you have two choices. Dissolve polygons to show total coverage, or keep individual polygons to show which facility serves which area.
For a public resident-facing map, dissolved coverage is usually easier. For planning, individual facility polygons help identify which site carries the most responsibility. That matters when one branch closes for renovation and half the neighborhood suddenly loses its cool-headed anchor.
Show me the nerdy details
Isochrones are sensitive to network topology, impedance settings, walking speed, turn restrictions, barriers, and data completeness. A pedestrian network should include walkable paths, legal crossings, bridges, and connectors where appropriate. Avoid using road centerlines alone if sidewalks, trails, or pedestrian cut-throughs matter. For equity analysis, summarize population within each band using areal interpolation or block-level estimates when possible. Always document whether results are based on standard walking speed, slower walking speed, or a custom heat-adjusted assumption.
Add Vulnerability and Equity Layers
A heat refuge map becomes more powerful when it shows not only where cooling exists, but where need may be greatest. Heat does not land evenly. It pools around asphalt, low tree canopy, older housing, industrial corridors, and neighborhoods with fewer resources.
Equity layers should be used carefully. They are not labels for people. They are planning signals. The goal is to avoid making invisible need look like an empty space.
Useful layers to consider
- Older adult population: Especially age 65 and older.
- Young children: Households with children under 5 may need nearby relief.
- Households without vehicles: Walking and transit access become more important.
- Low-income households: Air conditioning and utility costs may be barriers.
- Renters and older housing: Cooling access can be uneven.
- Disability indicators: Travel time may need slower walking assumptions.
- Tree canopy and shade: Exposure changes the comfort and safety of a walk.
- Surface temperature or heat island data: Helps identify hotter corridors.
In one city review, the area with the fewest official cooling centers also had the lowest car access and the highest share of older renters. No single layer screamed. Together, they formed a choir with a very practical complaint.
Risk scorecard for heat refuge gaps
Heat Refuge Access Risk Scorecard
| Question | Low concern | Higher concern |
|---|---|---|
| Are residents within a 10-minute walk of indoor cooling? | Most blocks covered | Large uncovered clusters |
| Are older adults concentrated outside coverage? | No clear pattern | Several high-need blocks outside service areas |
| Is shade limited along walking routes? | Tree cover or shaded streets present | Long exposed corridors |
| Are hours reliable during heat events? | Extended or alert-based hours confirmed | Weekend or evening gaps |
| Can people verify before traveling? | Phone and webpage listed | No contact or outdated details |
Do not over-map private hardship
Use aggregated data. Avoid exposing individual households, medical needs, immigration status, or personal vulnerability. A map should guide resources, not pin a neon sign on someone’s private life.
If you publish neighborhood vulnerability data, explain what it means and what it does not mean. “Higher share of older residents” is a planning signal, not a diagnosis of a block.
- Use aggregate data.
- Explain indicators plainly.
- Focus on resource gaps, not blame.
Apply in 60 seconds: Add one equity layer, then write a one-sentence explanation a neighbor would understand.
Design a Map People Can Use
A heat refuge map has to work under stress. People may be tired, worried, on a phone, in glare, or helping someone else. This is not the moment for a legend that looks like it was assembled by a committee of raccoons with GIS certificates.
Design should reduce friction. Use readable labels, strong contrast, plain symbols, and a clear hierarchy. A person should understand the map in five seconds and trust it in fifteen.
Map design priorities
- Use simple colors: Cool blues for refuge areas, warm grays or light oranges for heat context.
- Label the most useful places: Name key libraries and cooling centers.
- Show time bands clearly: 5, 10, and 15 minutes should not look like three nearly identical puddles.
- Make hours visible: A popup or label should show today’s hours when possible.
- Add update date: Trust rises when readers know when the data was checked.
- Support mobile: Many readers will use a phone, not a wall monitor in a NASA control room.
For accessible visuals, review accessible map design. If you need a handout for outreach workers, connect the workflow to print-ready map PDFs. Public health maps often need both: a live web map and a paper copy that survives a folding table, a clipboard, and a hot afternoon.
Use popups that answer real questions
Every facility popup should answer:
- What is this place?
- Is it open now or during heat alerts?
- Who can use it?
- Is it air-conditioned?
- Are restrooms, water, seating, and accessibility features available?
- How can someone verify before going?
Coverage tier map
Coverage Tier Map for Public Communication
| Tier | Map meaning | Suggested message |
|---|---|---|
| Tier 1 | Within 5-minute walk | Closest heat relief options |
| Tier 2 | Within 10-minute walk | Reasonable walking access for many residents |
| Tier 3 | Within 15-minute walk | Plan carefully, especially during high heat |
| Gap area | Outside 15-minute walk | May need transit, outreach, mobile cooling, or new sites |
Make print and mobile versions different
A mobile map can use popups and filters. A printed map must show essentials at a glance: facility names, hours, phone number, and a small legend. Do not ask paper to behave like a touchscreen. Paper is dignified, but it has limits.
For public posters, include a QR code to the live version, a city hotline, and a large update date. During heat events, outdated maps age like milk in a parked car.
Common Mistakes
Most heat refuge mapping mistakes are not dramatic. They are small, practical misses that quietly reduce trust. The map may still look clean, but readers feel the wobble.
Mistake 1: Mapping dots instead of access
A dot map is a starting sketch. It is not an access analysis. Without walk-time isochrones, you cannot see barriers, service gaps, or false closeness.
Mistake 2: Ignoring hours
Hours are not a footnote. They are part of access. A library that closes at 5 p.m. may not help during evening heat stress. A senior center closed on weekends may create a dangerous gap.
Mistake 3: Using one walking speed for everyone
Standard walking speeds can exclude slower walkers from the story. Add a slow-walk scenario when the audience includes older adults, people with disabilities, families with children, or residents in high-heat corridors.
Mistake 4: Forgetting barriers
Highways, rail lines, missing sidewalks, unsafe crossings, steep slopes, and disconnected street grids can shrink real access. If the isochrone shape looks strange, inspect it. The map may be revealing a hidden barrier, not making a mistake.
Mistake 5: Publishing without verification
Unverified locations can harm trust. At minimum, confirm name, address, category, hours, and contact details. I have seen one cooling site listed with last year’s hours. It was a calendar fossil, and fossils do not provide air conditioning.
Mistake 6: Hiding the update date
Heat response changes. Sites open, close, extend hours, or activate only during alerts. Add “last reviewed” on the map, in the popup, and near any downloadable file.
- Check each facility record.
- Inspect uncovered high-risk areas.
- Test the map on a phone before publishing.
Apply in 60 seconds: Open your map on mobile and try to find the nearest open cooling site in three taps.
When to Seek Help
Heat refuge mapping touches public safety. You do not need a full consulting team for every neighborhood map, but there are moments when expert help is wise.
Seek public health or emergency management help when...
- The map will be used during official heat alerts.
- You are publishing instructions for vulnerable residents.
- You need to coordinate with shelters, libraries, transit, or emergency services.
- Facility hours change based on heat index or official activation.
- You are mapping outreach for older adults, unhoused residents, or medically vulnerable groups.
Seek GIS help when...
- You need network-based isochrones, not distance rings.
- Your street network has missing paths, bridges, or pedestrian links.
- You are comparing service coverage across neighborhoods.
- You need to summarize population inside and outside walk-time bands.
- You must create accessible, print-ready, or multilingual map products.
Seek legal or privacy review when...
- You are combining location data with health, housing, or service records.
- You are publishing maps that may reveal sensitive sites.
- You are using third-party tools with resident-submitted data.
- You are making claims about ADA access, official safety, or government service obligations.
A 15-Minute Action Plan
You do not need to finish the entire map today. You need to start with the part that prevents the most confusion. Think of it as sharpening the pencil before drawing the fire escape route.
Minute 1-3: Pick the map purpose
Write one sentence: “This map shows residents which heat refuge locations are within a 5-, 10-, or 15-minute walk.” That sentence will keep your design from wandering into a decorative swamp.
Minute 4-6: Create your minimum dataset
Start a spreadsheet with columns for name, category, address, latitude, longitude, hours, accessibility notes, phone, webpage, and last verified date.
Minute 7-9: Add five starter locations
Choose a small test area. Add one library, one official cooling center, one recreation center, one senior center, and one shaded or water-relief location if appropriate.
Minute 10-12: Choose your walking bands
Use 5, 10, and 15 minutes. If your audience includes older adults or high-heat routes, plan a slow-walk version too.
Minute 13-15: Write your safety note
Add one plain sentence to the map: “Check hours before traveling, and call emergency services if someone shows signs of severe heat illness.” It is not fancy. It may be the most important line on the page.
Quote-Prep List for Hiring Help
If you hire a GIS analyst, civic tech consultant, or public health mapping partner, ask for these items:
- Examples of previous isochrone or service-area maps
- Routing data source and walking speed assumptions
- Plan for verifying facility hours
- Mobile and print map deliverables
- Accessibility review process
- Update workflow during heat events
- Cost for one-time map versus seasonal maintenance
FAQ
What is a heat refuge map?
A heat refuge map shows places where people may find relief from dangerous heat, such as libraries, cooling centers, community centers, senior centers, shaded parks, splash pads, or other public resources. A strong map includes hours, access notes, contact details, and walking-time areas so residents can understand what is realistically nearby.
What is a walk-time isochrone?
A walk-time isochrone is a mapped area showing where someone can travel within a set number of minutes on foot. For heat refuge planning, common bands are 5, 10, and 15 minutes. Unlike a simple circle, an isochrone follows the walking network, including streets, crossings, paths, and barriers.
Are libraries good heat refuge locations?
Libraries can be excellent heat refuge locations because they are usually public, familiar, air-conditioned, staffed, and equipped with seating and restrooms. However, hours, closures, accessibility, rules, and heat-alert policies must be verified. A library is useful only when people can enter it at the time they need relief.
Should I map cooling centers with distance circles or isochrones?
Use isochrones whenever possible. Distance circles are fast, but they ignore street networks, highways, rail lines, missing sidewalks, and long blocks. Circles can make access look better than it is. Isochrones are better for showing real walking reach, especially when public safety and equity are involved.
What walking time should I use for cooling center access?
Start with 5-, 10-, and 15-minute bands. A 10-minute walk is often a useful planning benchmark, but extreme heat changes what is reasonable. For older adults, people with mobility limits, caregivers with children, or neighborhoods with little shade, consider a slower walking speed or a shorter target.
What data do I need to make a heat refuge isochrone map?
You need verified refuge locations, addresses or coordinates, facility categories, hours, contact details, accessibility notes, and a pedestrian routing network. For deeper planning, add population, age, car access, income, disability, tree canopy, surface temperature, and transit layers.
How often should a heat refuge map be updated?
Update it before each heat season, during major heat alerts, and whenever facilities change hours, close, open, or adjust access rules. Public-facing maps should show a clear “last reviewed” date. During summer, even a small outdated detail can send someone to the wrong door.
How can I make a heat refuge map easier to read on mobile?
Use large labels, clear symbols, simple colors, readable popups, and a visible search or location button if your platform supports it. Keep the legend short. Put the most important details first: name, open status, hours, walking time, phone, and accessibility notes.
Can I include shaded parks and splash pads on the same map?
Yes, but separate them from indoor cooling locations. Indoor air-conditioned sites, shaded outdoor areas, splash pads, and drinking fountains offer different levels of relief. Use different categories and explain what each type means. Do not let a tree icon pretend to be a cooled room.
What should I do if a neighborhood has no refuge within a 15-minute walk?
Treat that area as a planning gap. Possible responses include temporary cooling sites, extended library hours, transit partnerships, mobile outreach, shuttle service, shaded route improvements, water stations, or targeted wellness checks. The map should help prioritize action, not merely document the absence.
Conclusion
A heat refuge map begins with a simple human question: when the air becomes unsafe, where can someone go, and can they realistically get there? Dots alone cannot answer that. Walk-time isochrones can.
The practical next step is small enough to do within 15 minutes: make a five-row spreadsheet of nearby libraries, cooling centers, or community buildings, then add hours, phone numbers, and a last-verified date. That modest table is the seed of a better map. Add walking bands, equity layers, and careful design, and the map becomes more than civic decoration. It becomes a cool room drawn in advance.
Last reviewed: 2026-05
