Utah in July..... A/C question.

Hey all, we'll be touring Grand Canyon and the Utah NPs in July. My main question is, which ones AREN't at altitude and would require hookups for A/C?

We're staying at Trailer Village at the Grand Canyon and Watchman at Zion. Other than that, nothing booked yet and we're planning on going to Bryce, Arches, Canyonlands, and Capital Reef.