That is COOL! Love the DIY.I had to build my own swampcooler, the ones they sell won't work in a moving vehicle without water dripping all over the inside of your van.
I use the celdek evaporater pad because it will last for years. The ones that use the blue durakool pads or even the swampys, the pads get clogged up after a few months restricting airflow. As far as water use, I can go a weekend running the swampcooler most of the day and use less than a gallon of water for both days, on real hot days you might use a gallon a day.
I been using swampcoolers for the past 8 years in my van in the southern california area, they keep me cool even on the hottest days. Even on the hot humid days, its better then just using a fan. I learned from trial and error how to get the swampcooler to work for my situation.
I'm sure a swampcooler will work in a hot humid area, as long as its large enough. It will use more water but still use less power than an AC. I've run 2 swampcoolers at the same time on very hot days and the solar panel easily kept up with the power use.
The inside of the swampcooler I built, notice the celdek evaporator pad, it never gets clogged by water impurities even after years of use. They are suppose to last for 5 years which seems to be accurate. One thing about swampcoolers you need have outside air going into the evaporator pad, otherwise they wont work. On mine I feed the swampcooler through my roof vent.
View attachment 31178
This is the smallest swampcooler I built, I ran it a whole summer and it worked good. View attachment 31179
What's the difference in temp inside your vehicle when it is, say, 100 degrees outside
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