I'd rather freeze a few 2 liter soda bottles for the ice water. I can also use them when I take my ice chest to town for groceries.
Gravity fed requires no ice; heat is transferred into lower container's water.
A hybrid of both the car and house air conditioning systems could be built, so you'd have a fan powered by solar battery charger, using gravity fed water.
Here's a really radical alternative: your hybrid, using copper coils, could blow cold air INto an ice chest, for a portable refrigerator without household current!
HOUSE AIR CONDITIONING
This one requires a pump.
This one is gravity fed: no pump, but it won't work if you let the top bucket run dry! No ice required!
AUTO & CAMPING AIR CONDITIONERS
Here's one using 12v fans. It operates heat or cool. I'd use a Styrofoam ice chest, rather than the bag, for stability. The really cool part of this is that your electricity source can be a 12v solar battery charger. They're pretty cheap at online auctions. This would be heat or cooling for camping trips, vehicles, etc. where alternating current isn't available. Items can be heated or cooled using a car refrigerator, which operates on both settings, and can also be powered by the solar charger.
Homemade Air Conditioner - The most popular videos are a click away
Another 12v, using an ice chest. I'd use the frozen 2 liter bottles for this one: recycle the water.
12v Portable Air Conditioner Camping Tent - VidoEmo - Emotional Video Unity
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