· 12 min read · planning · public space · architects · municipalities · specification · lifecycle · pilots
Ten planning questions before installing outdoor cooling in public space
Site checks, layered microclimate strategy, drift control, infrastructure, controls and sensors, lifecycle cost, installation timing, success metrics, seasonal pilots and the documentation an approval actually needs — answered in detail for architects and municipalities.
What site conditions must be checked before installing outdoor adiabatic cooling?
Every project begins on the ground, not on the page. Before specifying a Cooling Walk arch or a Cooling Spot, we walk the site with the architect or municipal team and read the conditions that will determine where, how and when the system performs. The most important variables are sun exposure, the existing pattern of shade, prevailing wind direction and speed, the geometry of pedestrian flow, the presence of nearby façades, the chosen paving and its drainage, and the proximity of sensitive surfaces such as historic stone, public art and electrical infrastructure.Two further checks belong on the same site visit: the location of the nearest potable water connection and electrical supply, and the maintenance access route — how a technician will reach the pump, the filters and the nozzles in two years’ time, in summer, with a service van. We also note vandalism risk and any neighbouring private property whose occupants must be considered in the design.A site survey is not a formality. It is the moment at which a brief becomes a project. We provide every prospective client with a one-page site checklist on request, so the right photographs, dimensions and connection notes are gathered the first time.
Should adiabatic cooling be combined with shade, trees or canopies?
Yes — and treating mist cooling as a single intervention is one of the most common mistakes in early planning. Adiabatic cooling performs best when it is part of a wider microclimate strategy that includes shade, vegetation, urban form and material choices. The mist lowers air temperature; trees, pergolas and canopies reduce radiant load from the sun and from heated surfaces. Together they shape comfort. In isolation, each is a partial measure.In public space, the strongest results come from layering. A shaded plaza with reflective light-coloured paving and a central Cooling Spot is more comfortable in a heatwave than any one of those elements alone. A pedestrian street with a sequence of Cooling Walk arches set under existing tree canopy will outperform the same arches in full sun. Urban-cooling guidance from the European Environment Agency and from city heat-action plans across southern Europe consistently treats evaporative cooling as one tool within a larger set of strategies, alongside greening, surface reflectivity and urban geometry.For architects and landscape designers, this is liberating: the adiabatic system does not have to do everything. It complements what the rest of the design is already doing.
How do you prevent mist drift in windy public spaces?
Wind is the variable that most often surprises a first-time specifier. A nozzle producing 15 μm droplets at 100 bar releases mist that, in still air, evaporates within roughly half a second. In a 4 m/s breeze, the same droplets can travel several metres before evaporating. Drift is therefore a design problem, not a product defect.We address it on five levers. Wind direction informs nozzle orientation — mist is aimed across the path of prevailing summer wind, never into it. Nozzle placement is set back from boundaries with shopfronts, monuments, restaurant terraces and electrical equipment. Operating pressure and droplet size are tuned to the local microclimate. Misting height is calculated against expected wind speed at the site. And the control system reads a wind sensor on the structure itself: when wind exceeds a configurable threshold — typically 4 to 6 m/s — the system pauses automatically and resumes when conditions return.For sites adjacent to roads, heritage façades or sensitive equipment, we provide a drift-risk drawing as part of the technical proposal. It is a routine deliverable, not an extra.
What infrastructure is needed for an outdoor mist cooling installation?
Mist cooling looks light. The infrastructure that supports it is conventional. A complete installation needs a potable water connection, an electrical supply sized to the pump, a sheltered location for the high-pressure pump and control cabinet, multi-stage filtration including UV sterilisation, a high-pressure line routed to the structure, structural fixing points or foundations, a drainage strategy where local conditions require one, and clear access for maintenance.The pump and control cabinet need a small, ventilated, lockable enclosure within roughly twenty metres of the structure — typically a service room, a niche behind a wall, or a discreet outdoor cabinet. Foundations vary with the geometry: a slim Cooling Walk arch can be bolted to a prepared paving slab, while a plaza Cooling Spot may need a poured concrete pad sized to the wind load.We supply a coordination drawing for every project that maps the responsibilities of the architect, landscape architect, mechanical engineer, electrical contractor and municipal works department. Procurement runs more smoothly when this exists in writing from week one.
What controls and sensors should a public-space cooling system have?
Comfort, water use and responsible operation all depend on the controls. We do not consider any public installation complete without temperature and humidity sensing, a wind sensor with automatic shutoff, a programmable interval timer, a manual override for events and demonstrations, and a remote-monitoring option for municipalities and operators that need to see the system from a desk rather than from the plaza.The default operating logic is simple: run when the perceived heat is high and the air is dry enough for evaporation; pause when wind, humidity or scheduled quiet hours dictate. Public-space cooling guidance broadly agrees that misting should respond to heat-stress conditions rather than running continuously, because the cooling effect is local and time-sensitive — and unnecessary operation is wasted water without comfort gain.For mayors and climate-adaptation departments, we configure event mode (a button or schedule that runs the system at full duty for a defined period) and an automatic heat-alert mode that increases activity above a defined wet-bulb threshold. Both are standard features.
What is the lifecycle cost of outdoor adiabatic cooling?
A purchase price is not a budget. For municipal and institutional clients especially, total cost of ownership is the figure that matters, and we are explicit about it from the first proposal. Lifecycle cost includes design and engineering, the structure itself, the pump unit and control cabinet, installation labour, foundations and connections, water consumption across the operating season, electricity for the pump, replacement filters and nozzles, scheduled servicing, winterisation at end of season, occasional repairs, and — if specified — remote monitoring fees.For a typical Cooling Spot in a Slovenian municipal plaza, the annual operating cost (water, electricity, filters, servicing, winterisation) is modest in absolute terms and predictable year on year. Water and electricity together are usually less than the cost of routine landscape maintenance for the same area.We provide a transparent five-year lifecycle estimate on request, broken out by line. This is intended to make internal approval and capital-versus-operating budgeting straightforward — not to win the project on the lowest first-year number.
How long does it take to install an outdoor cooling system?
Installation time is a function of the project, not the product. A small Cooling Walk arch on prepared paving with existing water and electrical points can be commissioned in two to three days. A custom atelier commission on a complex plaza, with foundations and new service runs, is measured in weeks. The procurement timeline before installation is usually longer than the installation itself.We separate every project into seven phases for clarity: site check, concept, technical design, production, installation, commissioning and handover. Production for catalogue arches typically runs four to eight weeks; bespoke pieces run ten to sixteen. Site preparation by others (paving cuts, foundation pours, service trenches) happens in parallel.For municipal heat-resilience programmes that need to be operational for a specific summer, we recommend starting the briefing in autumn or early winter of the previous year. The technical design and production cadence then aligns naturally with a May or June commissioning.
How can cities measure whether outdoor cooling is successful?
Success in a public space is not measured by air temperature alone. The relevant signals are air temperature inside and outside the cooled volume, surface temperature of nearby paving and seating, perceived comfort reported by users, dwell time and visitor counts, performance during heat alerts, and operational records — uptime, water consumed, maintenance interventions.Research on outdoor mist spraying in hot conditions has consistently found measurable improvements in thermal sensation and thermal comfort when people enter the misting area, even where the air-temperature drop is modest. This supports the practical conclusion that comfort, not raw temperature, is the metric that matters in public space.For municipalities, we recommend a simple measurement protocol: a calibrated air-temperature and humidity sensor on the structure, a second sensor in the unconditioned reference area, periodic surface-temperature spot checks during heatwaves, and a short user-feedback card piloted in the first season. The combination produces a defensible record for the climate-adaptation department and for future budget cycles.
Can outdoor adiabatic cooling be used as a seasonal pilot project?
Yes — and we encourage it. A seasonal pilot is the lowest-risk way for a city to introduce adiabatic cooling. One playground, one square, one promenade or one park entrance can be equipped, monitored across a single summer, and assessed against a simple set of measures before any wider commitment.A pilot answers the questions that desk research cannot. Where do residents actually gather? How does the system perform on the hottest twelve days of the year? What is the real water consumption against the projected figure? How many maintenance interventions are needed? Are there control-setting adjustments that improve comfort or reduce drift? Each of these is concrete after one season; each is theoretical before.For pilots, we offer a short-term lease option in addition to outright purchase, so that a municipality can run a single summer of measured operation before deciding whether to expand into a permanent heat-resilience programme.
What documentation do architects and municipalities need before approval?
A complete documentation set turns a good idea into an approved project. The package we typically assemble for an architect or municipal client includes site photographs, a dimensioned plan of the intended cooling zone, water and electrical supply information, paving and surface details, installation constraints, a maintenance plan, safety and hygiene documentation, and the procurement documents required by the client’s internal process.For professional projects we add layout drawings showing the cooled volume, full product data for the chosen pieces, technical specifications for the pump and controls, written operating instructions, a seasonal maintenance schedule, and a commissioning checklist signed at handover. For municipal procurement we align this set with the client’s standard tender format on request.Documentation is not an obstacle to the project — it is the project, in writing. We are happy to begin with the questions on this page; the answers, gathered once, are the foundation for everything that follows.