I started running mine yesterday when it got up to 83 degrees for the second day in a row. That was only 3 and 2 degrees below the record highs for those 2 days. Today isn't even close. The record lows for the first 3 days of the month were 26, 27, and 26 again. I only have 2 window air conditioners and have left them installed the last few years. I got tired of taking the bedroom windows and screen out to crawl out on the awning and unscrew the outer part of the unit to pull it into the house.
Without A/C, when we have high temps several consecutive days without cool nights, it gets much hotter inside than outside. Like 95 inside if it's in the 80-85 outside. The first summer in my house I had long tapered candles in a pair of sconces I made, and it got so hot that the candles went limp and bent into a J shape. Not even Viagra would have helped. That's when I knew I really needed air conditioning. Box fans in the windows just weren't cutting it.