Door-to-door heat outreach through existing community health workers

Mechanism

Instead of building a new outreach corps, a city trains its existing community health worker (CHW) cadre, such as India's ASHA workers, to add heat protection to their routine door-to-door rounds in informal settlements:

• Before the season and before each alert: household visits with heat-illness awareness, hydration advice, and identification of high-risk members (elderly, chronically ill, pregnant women, infants).
• During alerts: intensified rounds, spotting early heat-illness symptoms, first response (cooling, oral rehydration), and referral to health facilities.

Because CHWs are neighbors with standing relationships, the message arrives through a trusted face rather than a poster or a siren.

Where it fits

City scale, strongest where large informal settlements exist and where a CHW cadre already operates with community trust. It reaches exactly the households that cooling centers, registries and mass media miss: people in tin-roofed informal housing who cannot leave home or do not respond to official channels.

Evidence

This outreach layer is the social core of the Ahmedabad Heat Action Plan (from 2013, South Asia's first). ASHA workers were trained for pre-alert door-to-door outreach in informal settlements, with NGO partners (Mahila Housing Trust trained about 1,500 ASHAs). The plan the outreach belongs to was evaluated by Hess et al. 2018 at about 1,190 avoided deaths per year, with a 27 percent mortality drop on days at or above 45 C. Attribution is to the whole plan, of which CHW outreach is one pillar.

Implementation path

1. Map the existing CHW cadre and its settlement coverage.
2. Build a short heat module (recognition, first response, referral) into pre-season CHW training, delivered before the heat season starts, not during it.
3. Partner with NGOs already embedded in the settlements to co-train and support workers.
4. Tie intensified rounds to the city's alert levels.
5. Compensate and protect the workers themselves: heat-appropriate scheduling, water, and pay for the added work.

Trade-offs

• The outreach layer is only as strong as the underpaid workers delivering it: ASHA honorariums run 5,000 to 15,000 rupees per month, the workers are themselves heat-exposed during rounds, and training often arrives late in the season.
• Adding heat duties without adding pay risks degrading both the heat work and the cadre's core health tasks.
• Effectiveness is inseparable from the wider heat action plan (alerts, health system readiness); a CHW layer bolted onto nothing has no escalation path.
• Attribution of mortality benefits to the outreach layer alone is not possible with current evidence; evaluations measure the whole plan.