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!

Water Contest

Participated in the
Water Contest



    • Frozen Treats Challenge

      Frozen Treats Challenge
    • Colors of the Rainbow Contest

      Colors of the Rainbow Contest
    • Pets Challenge

      Pets Challenge

    3 Discussions


    10 months 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.


    10 months ago

    This is so cool! (Pun intended.)


    Question 10 months 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?