I'm thinking, could something like this be put together ala an Instructible?
* Put some ice/salt/water in a cooler
* Use a variable speed pump to circulate water through tubing on a mattress pad; Use multiple zones for multiple people
* Run a remote to the bedside so each person can control his temperature
Only one thing wrong with your design.
""
he "Ice Water" models are not normally used for camping as they use about 12 pounds of ice PER HOUR at night and almost twice that during the day. This is generally not practical while camping,"
Here is what campers use:
http://www.swampy.net/camper.htmlBeen around for years and works.