Geoff’s Homemade Air Conditioner The system will cool an average room to a comfortable level in approximately 15-20 minutes. Depending on flow rate, a full bucket of water will last approximately 1-3 hours. I use a single bucket before bed on hot nights, which lets me get to sleep. Once the water runs out, the house has cooled off enough that the fan alone provides sufficient cooling. It doesn’t rip quite as hard as central air, but for less than $25 CAD I’m not complaining. (and, btw, that’s my girlfriend’s makeup mirror, not mine) The main factor affecting the performance is the temperature of incoming water. Cool water will work, but ice water will result in a cooler room, quicker…
