We spend far too much time between 90-105 to go without A/C. I started working in the OR at age 19 at 68F or under. Then when perimenopause hot flashes started I couldn't stand the house even at 78 degrees anymore. We live at 74 and even cooler at night or this girl doesn't sleep. 57 and still have those night sweats I am grateful we can afford to cool the house (power is cheap in Idaho.)