I was there this past April also, and it was usually needed during the day (mainly for our kid's nap time not for me). We let it run all night too, mainly for white noise but it wasn't absolutely necessary. I did turn it off a few times in the afternoon and opened the flaps (this was a pop-up). It did get hot that week during the day, but the humidity wasn't unbearable. Mainly it's a matter of personal preference and comfort level. If you're not going to be around the campsite during the day much, you'll probably be fine without it.