How to Make an Easy Homemade Air Conditioner from a Fan and Water Bottles

You don't have to buy an expensive air conditioner in order to beat the heat for a little while. Instead, you can cool down a room using water bottles and a fan. Either freeze the bottles and put them in front of the fan or attach the bottles to the back. Once you build your DIY air conditioner, you'll be comfortable and cool in no time!

1-Putting Frozen Bottles in Front of Your Fan
Pour 3 tbsp (51 g) of salt into each of your 3 plastic water bottles. Use disposable plastic bottles for the easiest set-up and clean up. Pour 3 tablespoons (51 g) of table salt per bottle. Put the caps back on and shake the bottles to thoroughly mix the salt.

• Any standard salt you have in your kitchen will work.

2-

Freeze all of the bottles. Leave them inside for a few hours until they are completely frozen. Once the water turns to ice, take the bottles out and set them aside.

• Salt lowers the freezing temperature of water and makes the ice colder.
• It may take longer for your bottles to freeze depending on the size of your freezer.

3-

Set the bottles 6 in (15 cm) in front of your fan. A table fan or box fan will work best, but you can use any fan you want. Turn on the fan and put your bottles in front of it. The air will cool down as it passes around the bottles. Keep the fan on as long as the bottles are frozen for a makeshift air conditioner.

• Spread the bottles out so they don’t block any of the fan’s airstream.
• Put the bottles on a small table in front of a standing fan.
• Don’t use the oscillation setting on your fan if it has one. Keep it pointed at the water bottles for the whole time.

4-

Put your bottles back in the freezer to reuse them. When the ice melts, simply freeze the bottles again. In a few hours, you can run your fan like an air conditioner again!

• Keep multiple bottles prepared in your freezer so you don’t have to wait for them to freeze again.