Heat intelligence + rooftop solar

Cool the right roofs,first.

CoolRoof ranks a city’s wards by heat load and exposure, shows what is associated with each ward’s heat, and checks rooftop solar for any home — with the source and confidence behind every number.

Open the app See how it works

Ward priority, live from the API

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cool firstlater

Surface temperature at a late-morning satellite pass, not air temperature. Demo city.

Wards assessed—

People exposed—

Mean ΔLST above rural—

First to cool—

Three jobs, one working view.

Built for city heat-action teams and for households deciding about solar.

Know which wards to cool first

A transparent priority score from satellite surface heat, exposed population and vulnerability, with a plausible rank range instead of a falsely exact number.

Map layers: ΔLST raster, hotspots, facilities, satellite fire detections, protected areas
Drivers shown as ‘associated with’, never as proven causes
Top roofs per ward, with cost withheld until verified

Check rooftop solar in a minute

Enter roof area and monthly units. Get a recommended system size, the PM Surya Ghar subsidy with its policy version and source, and a payback range.

Sketch your roof outline on a grid to measure its area
Subsidy is policy fact; generation and payback are labelled estimates
A PDF summary — not the official application

System3 kW

Subsidy₹78,000

Paybackestimate range

Example: 70 m² roof, 400 units a month, demo tariff.

Alerts you can trust, in English and हिंदी

Planners enter official warnings and approve public advisories with a two-person check. The public sees what is active, can listen to it, and can ask the assistant.

Heat-dome signal is a forecast signal, never an official warning
Advisories need approval before they publish
The assistant only states numbers its tools returned

Official warningentered by staff

Heat-dome signalforecast, not a warning

Public advisoryapproved, with audio

Every number says where it came from.

Heat and solar decisions get argued over. CoolRoof keeps the evidence attached.

Provenance on every valueMeasured, derived, estimated, policy, user-supplied or unavailable — with source, date and resolution on hover.

Indicators, not diagnosesLand and habitat signals are labelled as indicators. Unavailable data is explained, never left blank.

Honest limitsSurface temperature at a late-morning satellite pass is not air temperature, and single roofs cannot be resolved at this pixel size.

See your city’s hottest wards.

The app runs locally against the demo city and a synthetic tariff.

Open the app