Homemade Air Conditioner DIY. The “11 Gallon Bucket” Air Cooler Simple design. Easy Instructions. The Ultimate Ice-Based “ice bank driven” air cooler. Cools for hours at a time. Large capacity air cooler produces cool air for 8+hrs with a fully loaded bucket. use “ice blocks” for best results – holds well over 50 lbs at a time. Great for personal space cooling. has a very low power draw (and the solar power option lets you use in “off-grid/no grid” situations). Made using an 11 Gallon (44Qt/42L) wastebasket, 10 Watt 12VDC fan, and a few plastic connectors. 3 power options… runs on house current, solar panel or a battery.