text:  A lot of the increase correlates with really fast growth of our homeless population. Unsheltered people make up a large portion of those who die in the heat each year. So there have been major investments at the city, county, and state level in homeless shelters and housing solutions. But more specifically to address heat, the city and county have been looking for ways to offer more access to cool spaces in summer months. There are dozens of heat relief sites across the Phoenix area.