would you rather that people crack open fire hydrants?
No. I have the solution. During heat waves we have fire departments take to the streets for a "training exercise" where they just hose all the hot people down. Police departments can equip their officers with water guns to carry out "training exercises" where they only target people who are sweating.
Our local fire and police departments get some training by using cheap water (as opposed to bullets, grenades, etc...) and the local population gets to cool down. Win/Win. INGO can even arm themselves with water guns and go spray down some sweaty people who don't have the luxury of AC. We'd be doing our communities some real nice charity while getting quality moving target practice with non-lethal water guns.