Easy DIY: Make A $454 Air Conditioner For Under $20

DIY Homemade AC

Sure, staying cool usually falls under the heading of a luxury, rather than a survival necessity, but in the some situations, managing a comfortable temperature in your dwelling can be a huge morale-booster. It also helps promote better, more restful sleep and, heck, building a unit like this is also a lot of fun. Don't expect miracles, though. This type of cooling works best on hot, dry air, so if you are in a high-humidity situation, you'll need a different alternative. Obviously you'll also need a power source, but this versatile method will work with an A/C fan or one that runs on direct current, so you can use battery power stored from wind, water, solar, or whatever you have available.

As mentioned, this evaporative cooler works best in drier air. That's because the warm dry air is better at evaporating the moisture flowing through the cooler. That evaporation process uses up lots of the air's heat energy, leaving some nice, cool, moist air.

STEP 1: GATHER THE PARTS

To get started, you'll need to gather these commonly available, inexpensive parts. You don't need anything fancy or expensive and chances are you have some of these tools and materials already. If not, you'll find what you need at a hardware store locally or on Amazon.

step one gather parts

Here's a list of the parts and tools you will need:

  • 5-gallon plastic bucket with a lid; you can find one at a Home Depot or a similar hardware or building supply store
  • Drill with a ‘hole saw’ type bit. Any common electric drill should work just fine. You can get an inexpensive hole saw set at any hardware store or Home Depot. Since you'll only be cutting plastic you don’t need anything fancy. Both 1.5 inch and 2 inch drills are good sizes to have for this.
  • Evaporative cooler pad that is at least 14×31 inches. Dura Cool makes some that are available from Amazon. You can also find them at Home Depot or another hardware store.
  • Utility scissors or shears that will be used to cut the pad to size
  • Long straight-edge ruler that'll help you cut accurately
  • Permanent marker or tape to indicate the maximum water level
  • Fiberglass screen as used for windows or screen doors or a garden cloth will also work
  • Sturdy utility knife
  • Small DC powered fan
  • Submersible aquarium or fountain pump (look for a 12 V DC submersible water pump on Amazon)
  • About 4.5 feet of aquarium tubing to fit your pump (usually 1/4 inch or 5/16 inch clear vinyl is fine)
  • Small clamp that'll be used to pinch the hose
  • Have a thumbtack ready

Once you have the parts and tools gathered, the rest is easy. We'll get into the step-by-step specifics after the break and there's even a video to show you exactly how it all goes together, along with a demonstration of the finished cooler.


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104 Comments

  1. Joey Nichols said:

    I already built a home made one I will see about taking a picture and showing you later

  2. Jim Slaughter said:

    I used a foam cooler, put a dryer vent hose on one end and a fan on the other. Fill with ice, works great. Will even work in humid climates!

  3. Jordan Seward said:

    Cassandra Rose Seward
    We can do this. I would love to, win I get the time, and tools.

  4. Bobby Lococo said:

    If it was hussein, it would be all muslim brotherhood at a gay bathhouse chanting “allah snackbar”…

  5. Marcy Bird said:

    Yea, saw these last year. Be buying ice out the$#%&!@*tho. Lol

  6. Tommy SanFilippo said:

    You can fill some plastic water bottles and just refreeze them. Just a thought. I know the heats been killing you ladies.

  7. Tommy SanFilippo said:

    You can fill some plastic water bottles and just refreeze them. Just a thought. I know the heats been killing you ladies.

  8. Ron Dente said:

    i used$#%&!@*lol Y dont it work in humidity? My ice melts too fast in 90 degrees 🙁

  9. Clif Janicek said:

    Hey sir how decent does it work?My work truck a.c. kee0s going out and tired of being out of a.c. down here in Texas any help is appreciated.Thank you.

  10. Darrell Scott said:

    Surprised that harbor freight drill didn’t burn up , drilling into that bucket

  11. מיכאל חנה ישראל said:

    Very similar to my design that used a 12v fan and ran off battery charged with solar trickle charger… Never really worked as desired… Was still a fun project.

  12. Joe Mcandrews said:

    use foam to line the sides of the bucket i made mine like that ice hold for a long time plus using milk jugs and blocks of ice it holds ice longer then smaller cubes everyone in my family laughed till i used it then all sudden people wanted me to make them for them i love mine i use it all the time campn and even in my own apartment

  13. Ron Dente said:

    i lined the sides with styrofoam, its super insulated. I hear u! Everyone laughs until they realize they could sure use 1 themselves. I even added insulation to the outside. I use 32 fl oz frozen bottles and switch em out as they melt.

  14. Rob Rau said:

    Did not open the article but I could not help noticing it says it works better in dry climates. Apparently it relies on evaporation for cooling period that is cute and all but dehumidification is one of the best parts of air conditioning. That’s why it’s called an air conditioner and not just an air cooler it actually conditions the air

  15. Andrew Reed said:

    Curious as to the cost to make ice vs cost of electricity for an equivalent ac

  16. Robert Griffin said:

    Anyone ever try just throwing a bag of ice in there shop vac and using that? I haven’t but I been considering it.

  17. Ryan Bard said:

    so uh…lol…. mow many BTU’s can you get out of that lol

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