That is absolutely wild to me. I also lived in NYC for 10 years, the summers there are magical. The city comes alive in such a unique way, people are outside relaxing in the parks, having backyard and rooftop parties, heading out to the beach on the weekends. There are a bunch of great weekend trips to be had a few hours away by train in Long Island or Connecticut or upstate NY. You can join an after work rec league with friends. There's concerts in the park once or twice a week, and free movie showings on the waterfront. The bars and restaurants are more lively.
One of the best parts of NYC in general is just how much there is to do if you like getting out and being social, and in the summer it's just turned up to the max.
Most apartments don't come with AC, but as long as you can afford $300 for a good floor unit to put in front of the window you can keep your home temperature very comfortable.