DIY Evap Air Cooler. This design uses Two 5-Gallon Buckets (stacked high) to make an air cooling "tower". produces powerful breeze and low temps. (drops 80F air to 58-59F). The dual-bucket design allows the unit to hold 5 gallons (for all-day cooling). temp. tests and full build included in the video. *note that it can be AC or DC powered. for DC power - one 12v solar panel (15-20 watt) can power fan (10w) and DC water pump (5-10w)... or just use 12v battery. *be ready for summer... once it's built, all you need is water & sun and you've got cool air! if you like the vid. please rate, subscribe, and share.