So i got this idea while taking a cold shower during hot summer, when i realized that water that comes from water facility is really cold. The water in my area is only 15 -17 °C during summer and i figured out an idea of how to use that to make cheap Air conditioning unit.
New/Used Car radiator with fan
Some PVC piping
A thermostat or a simple on/off switch
Power supply ( Car battery or a 12 V DC converter)
Mounts for car radiator and PVC pipes
Power drill for drilling holes in wall
The idea of this AC unit is that it is using Cold water from well or a local water supply facility which is cooled by ground that surrounds pipes that lead to your house/building/apartment. The key is to use that water instead of freon as a refrigerant.When the cold water is brought to the car radiator, the fan is dispersing that coldness into the air, which leads to cooling down that area or room. Constant pressure from a water source will keep the water running, so you don't need any water pumps. If the water warms up you can use it to fill up you toilet flusher or you can use that water to wash hands/dishes, or you can just use the water to water your plants or you hydroponics.
Since it is using water instead of freon gas it is making this AC environmentally friendlier, plus you can use recycled car radiator, and recycled PVC piping.
The main problem is that this AC unit is really hard to make in my country because we still use massive concrete and clay blocks to build houses. it would require to drill the thickness of entire wall ( 20-25 cm ~ 7 - 8 inches ) to place pipes that bring and drain water to and out of a car radiator. But it is relatively easy to mount it in American style houses.
This AC unit is cheap to make, easy to build, eco-friendly, and it doesn't use to much of electricity.
So this is only the concept, if you have any suggestion please write them in comments
PS. sorry for grammar mistakes my English is not perfect