How To Make A Homemade Air Conditioner – Tips & Tricks

Air conditioner is such a precious thing that makes our life cool and fresh. Obviously we can try to survive simply by opening the windows, but that has two problems: that the air that enters the homes is not always cold and that it is full of mosquitoes, flies, moths and other annoying insects. The best option is to use fans or air conditioners, but since these are not exactly cheap, there are low-cost alternatives such as the different “homemade” air conditioners that we propose below.

Home air conditioning with ice

It is simple to create and use, cheap in terms of components and does not consume much energy, so we will help with family expenses and respect the environment. However, it may be unsuitable for people sensitive to colds or with respiratory problems.


  • Expanded polyethylene box: It is important that the box is large enough to fit a medium ice bag without it touching the fan.
  • Ice bags
  • American tape
  • One elbow of PVC pipe.
  • Small electric fan
  • Paper aluminum

Steps to follow

  • Stick the aluminum foil to the walls. That will make it more heat resistant and waterproof. Use duct tape to attach the foil and make sure to seal the joints tightly.
  • Drill two holes in the box lid, one the diameter of the tube and one the size of the fan. The tighter the holes, the better the appliance will work, since there will be fewer leaks.
  • Insert the tube and fan into the holes and fix them tight. Make sure that the fan draws the air from the box out and not the other way around, as that is the most important part of the mechanism. Leave the fan cable out of the box.
  • Place the box near an outlet.
  • When you want to use the appliance, put the ice inside the box, cover it, tape it closed and plug in the fan. The cooling effect will be immediate and the drop in temperature will make the room habitable.

Home air conditioning for car

If we have the heat problem in the car, we can build a small device, similar to the previous one, that can be adapted to the vehicle’s air mechanism.


  • beach fridge
  • Various computer fans
  • A car radiator
  • A car or household appliance water pump

Steps to follow

  • We place the water pump inside the fridge to create a closed water circuit that goes through the fridge and connects to the radiator.
  • We fill the fridge with ice.
  • We place the fans on one of the walls of the fridge, so that they take out the air.
  • We connect the fans and the water pump to a jack that can be plugged into the lighter socket (both the fans and the pump are prepared, since they are 12V), and we already have a portable air conditioner.

Air conditioning without ice

The previous devices, although practical, have three drawbacks:

  • They use ice.
  • Its effectiveness is only maintained for a while.
  • They consume electricity

On the other hand, the home air conditioning that we propose below, is completely autonomous, can be used anywhere without using any type of power or fuel and is also made from recycled materials.

Its operation is based on the principle of pressure cooling, which can be verified very simply: if you blow with your mouth open, the air will come out hot, while if you blow with your mouth almost closed, the air will come out cold. So if you duct air through a large opening into a small one, it will cool down when compacted. And, what is even more interesting, in times with more ambient freshness, you can reverse the air circulation by turning the board and achieving the reverse effect. A video tutorial added the might make your work much easier!


  • Plank the size of a house window (the one you are going to use as an air source). The plank can be of any material, but it must be a material that is easy to drill and rigid. If it is transparent, it will obviously allow light to enter, but transparent materials are usually less malleable than wood, for example.
  • Plastic bottles with screw caps (better if they are all the same).
  • Contact tail.

Steps to follow

  • Cut all the bottles in half. 
  • Remove the plugs and use one to mark circles of that size on the board, forming lines. Cut out the holes with a drill or similar.
  • Glue the outline of the holes and place the necks of the bottles in them, so that all the “asses” remain on one side of the board and all the “mouths” on the other.
  • Close the bottles with the caps.
  • Place the plank in occupying the window opening, either fixedly, with nails, or with some temporary fixing system, such as mosquito nets. The stoppers should be towards the interior of the house, so that the air enters through the wide part of the bottles and compacts and cools before entering the room.

Although the temperatures reached by the air in this type of air conditioning are not very low, they do approach those of the commercial air conditioners, but with zero consumption and the advantage of being able to regulate the amount of air easily. Regardless of the air temperature outside, the air inside will always be cooler.

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