Welcome to the forums toygun, I also live in the south, (completely against my will of course). Specifically, the deep dark swamps of South Georgia. I started a thread here
that may be of interest to you. I hadn't considered the heat at night.
Your question gave me this idea
. It takes 2 D cells and can run for hours. A simple rig to a ridgeline and Bob's your uncle. A co-worker used this a while back and it worked great.