DIY Evaporative Air Cooler! How to make a simple "Indirect" Evap Air Cooling System! Works great! this unit is made by combining one of my "direct evap" air cooling units with a radiator (plus a fan and pump). this creates what's called an "indirect" evap air cooler! these differ from the more common "direct type" in that indirect units create the cool air without adding any humidity to the room air! another benefit is its low wattage draw *only 39 watts! (plus it can be AC or DC powered - so it's good for on or off-grid use). a 12v battery or a 12v solar panel can easily power it!. the basic process: the main thing to know is that evap air coolers are also evap water coolers! they cool down both the air and the water to essentially the same temperature. these indirect units take advantage of that water cooling ability and use the cold water to make the cold air.

how the unit works: cold water in the tub is pumped through a heat exchanger (the radiator). this quickly cools down the radiator. then, using a fan, the air in the room is pulled through the cold radiator (which cools down the air). that's basically it, as the room air is cooled the water is warmed. (that's the 'heat exchange'). finally, the warmer water that exits the radiator is returned back to the water reservoir where it is quickly re-cooled. note that the water-cooling potential of the direct evap unit (the tote) far outweighs the radiators ability to heat it (so the water in the tub stays cool).
- please rate, comment and share! 🙂👍 ...also check below for extra tips/info/links.

🟢 Tip: if you're going to power the unit with a 12v solar panel it's best to use a 75w-100w one (to make sure you get the amps that you need)

🟢 Here's the link to my video on how to build the "tote evap air cooler" (previously posted video).    • DIY Evap. Air Cooler! - Tote Evap. AC...  

🟢 Want to learn more about indirect evap cooling? here's a link to another video of mine showing how to set up a larger "room and house" size indirect evap air cooling system. has lots of extra info. (it contains almost everything i know about indirect evap cooling)    • DIY "INDIRECT" Evap Air Cooler! (No H...  

🟢 Want to run a system totally off-grid? here's a link to my "100% solar panel powered" system (just runs on 12v solar panels). no batteries needed!    • DIY "Indirect" Evap Air Cooler! - Pro...