text:  Phoenix is investigating more than 300 suspected heat-related deaths, and the sidewalks have been hot enough to cause severe contact burns. With much of the country gripped by heat, Hawaii has seemed mercifully cool by comparison. But Dr. Diana Felton with the state's Department of Health says that heat can be a problem for people in Hawaii, too. Felton says the health department has preliminary data that shows between 400 and 600 people per year have sought emergency care for heat-related illness.