We're pretty comfortable today inside the house. It is 101 degrees outside, and 77 in here, with windows closed, shades drawn and ceiling fans on. We're lucky to have a good house for this - the newer part of the house is tremendously well insulated, and the older part, is, for reasons completely inexplicable to me, cool in the summer while it is cold in the winter. The dogs have dug a den under the porch and seem happy there. But even when we lived in a fourth floor apartment, we could manage with regular cool showers, window fans and trips to the movies. We had an air conditioner for a while - and then my cat, Entropy (now long deceased) had a horrible incontinent period as he was dying, and peed in the air conditioner. The scent of cat-urine processed cool air was not worth the price.
But the heat is frustrating and scary, not least because it leads us to the worst kinds of short-term thinking. I can't count the people I know who say they "need" air conditioning - even though air conditioning emits greenhouse gasses at a rate that means that their kids are only going to need it much worse. We're unwilling to endure even the shortest term discomfort for long term security.
Not to mention the fact that everything feels worse when you come out of air conditioning. Unless you are in serious danger of health consequences, find other ways, particularly here in the Northeast. And remember, it is temporary. Winter will be here soon enough.