DIY Air Conditioner

Introduction: DIY Air Conditioner

This is my simple take on a DIY air conditioner. The cooling effect results from water evaporating. In order to increase this effect, I'm using a pump with a mist nozzle and a fan. The pump and the fan are powered by a 12V solar battery, so the system works well off the grid too. For this instructable you will need:

Step 1: Prepare the Bucket

  • Fill the bucket with tap water.
  • A gallon/ 5 liter will be enough.

Step 2: Prepare the Pump

  • Insert the micro nozzle into the silicone hose.
  • Insert the silicon hose into the outflow of the pump.
  • Put the pump into the bucket with water.

Step 3: Prepare the Fan

  • Put the fan inside the bucket.
  • Moisten the suction cup before putting it on the inside wall of the bucket, so it will stick better.
  • The fan faces upwards and should be close to the top of the bucket.

Step 4: Wiring

  • Connect the positive wires of the pump and the fan (red) by twisting.
  • Connect the negative wires of the pump and the fan (black) by twisting.
  • Make a final check: Ensure that the pump is under water. The silicone hose should lead to the top of the bucket with the mist nozzle facing downwards into the bucket.
  • Now you can connect the wires to the 12V battery. Negative to negative (black), positive to positive (red)

Step 5: Finished!

Now your DIY AC should be working! I achieve a temperature reduction of about 25%. Due to its small size this AC is only useful for a single room (e.g. bedroom or small cabin). However it's simple but effective. Enjoy!

PS: If you like this Instructable, please support me in the Water contest. Thanks!

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    3 Discussions


    1 year ago on Step 5

    I love super simple projects like this. You got my vote for the Water contest. I'm not lazy, I'm just real busy.


    2 years ago

    This is so cool! (Pun intended.)


    Question 2 years ago on Step 5

    Have you considered using a fan you can clip onto the upper edge of the bucket? Have you also considered using a round piece of ice which fits into the bottom of the bucket?