Do you have AC? Keep the doors open, and run a fan if that doesn't work and AC isn't enough. I know some people don't like running the AC too much because of all the energy. Even a couple days at 84 shouldn't be the biggest deal as it should cool off at night anyhow, but we have July and August around the corner and that's when you might need to bust out a fan on some days. Last year my room temps got up to 87 during those months, so be ready.