I used and still have my Kooleraire, I used it in my first trailer which did not have a/c. On a hot/humid night it brought enough relief to allow you to sleep, operating off a bag of ice for around 3 hours. I keep it in my Escape
trailer which has a/c and use as a regular icechest/cooler for potables while enroute and then fill my refer with the water and beer and soda at my destination. If I'm not hooked up or boon docking
I purchase a bag of ice, bring out the attachment and I have a source of cool air to fall
asleep to. So it has two components, an ice chest and the 12v attachment. Highly recommend if you do not use hookups and need some heat relief.