‘It happened so fast’: the shocking reality of indoor heat deaths in Arizona

Nationwide, one in five of the lowest-income households have no access to air conditioning, while 30% rely solely on window units, according to exclusive analysis by the National Energy Assistance Directors Association (Neada) for the Guardian.

As many as 60% of American households live paycheck to paycheck, while one in three report forgoing basic necessities such as food or medicine to pay energy bills and avoid disconnection.

Heat is the deadliest weather phenomenon in the US and globally, killing almost half a million people worldwide each year, according to the World Health Organization. The death toll is rising as human-caused climate crisis drives more frequent, more brutal and longer heatwaves.

Last month marked 30 years since what was then an unprecedented five-day heatwave in Chicago that killed more than 730 people and sent thousands to hospital. The majority were elderly, Black, isolated, low-income residents either lacking air conditioning or the money to run it.