Cool roofs could beat the heat and boost health in the pacific
NCT ID NCT06570993
First seen Jun 27, 2026 · Last updated Jun 27, 2026
Summary
This completed study tested whether painting metal roofs with a special heat-reflecting coating can lower indoor temperatures and improve health in Niue, a Pacific island nation facing record heat. Researchers enrolled 288 adults living in single-story homes with metal roofs. They measured heart rate, blood sugar, depression, and other health outcomes over time. The goal is to find a simple, passive way to protect communities from heat-related illness.
What this could mean
Our plain-language read of the trial. This is informational only, not medical advice or a prediction.
- Active substance
- Cool roof coating (heat-reflecting material applied to existing metal roofs)
- What this could lead to
- If effective, cool roofs could become a low-cost way to protect people in hot climates from heat-related health problems like high heart rate, poor blood sugar control, and depression.
- What could go wrong
- This is a single completed trial in one small island nation (Niue) with 288 participants. Results may not apply to other regions or larger populations. The intervention only addresses indoor heat, not other causes of these health issues.
This is an AI summary of the original study and may miss details. Read our disclaimer.
Study facts
What this study's own registry entry says, in plain language.
- Phase
-
Not a phased trial
Phase numbers describe drug development. The registry uses this when they do not apply, as it does for trials of devices, procedures or behaviour changes, and for observational studies.
- Participants
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288 people
The number who actually took part.
- Started
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Sep 2024
- Finished
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Jan 2026
- Lead sponsor
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Other sponsor
The registry's catch-all category, for sponsors it does not file as a company, a government agency, or a research network.
Who can take part
This study's own entry requirements. Only the study team can say for certain whether you qualify.
- Ages
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18 years and older
- Sex
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Anyone
- Healthy volunteers
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Accepted
You do not need to have the condition being studied to take part.
Show the full entry requirements Hide the full entry requirements
Copied word for word from the study's registry entry, so the wording is the study team's rather than ours.
Inclusion Criteria: Participant criteria: * Consenting adults aged 18 years and over. * Expected to be available to participate in the study for at least nine months in the next 12 months. Household criteria: * House has a metal roof. * House is single-story. Exclusion Criteria: Household criteria: * Unstable house structure that does not permit the application of cool roof materials. * Inaccessible by the research team. * Significant roof damage defined as any penetrative roof defect that results in a hole in the roof OR over 25% of the roof rusted.
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Conditions
The condition(s) this trial relates to.
As listed by the trial registrant
The condition terms exactly as the trial's registrant entered them.
Contacts and locations
Locations
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University of Auckland
Auckland, Niue
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