If it's that warm, then most would use an A/C if they had it. The problem is, most nights it hasn't been that warm. When the outside temp is in the low 60s and your A/C set point temperature is higher than that, why bother? If it's a window unit, it's going to just blow so why not have a fan blowing?
FWIW, my overnight low was 59° and I ran a fan and felt perfectly fine all night.