Homemade Air Conditioner (a/c)


I'm back with air conditioning project.

This is a simple Homemade, portable, 12V DC air conditioning system.

So guys you can make one using the following steps.

Step 1: Parts Required

  1. Plywood
  2. Old radiator fan
  3. Old windshield washer pump
  4. 12V 4A power supply (you can use a computer SMPS also)
  5. Copper tube (5 mm diameter)
  6. Tube connectors
  7. Electrical components ( detailed in step 3 & 4)
  8. Soldering iron
  9. Driller

Step 2: Plywood Preparation

Cut the plywood in required length.

Length will depend upon the radiator fan.

After cutting put holes for attaching copper tubes.

Make holes for switch & LED too.

Cut copper tubes also.

Step 3: Make Circuit for Pump

Circuit 1

Why i used a circuit for pump ?

It is not required run the pump continuously. So i made a repeating timer circuit.

I made it for 1 min on & 1 min off . Refer this to get more idea.Repeat-Timer-Circuit.

Give connections as per the circuit diagram given.

Step 4: Make Speed Control Circuit for Fan

Circuit 2

Speed controlling is necessary for a fan, i made a simple pulse width modulator for speed controlling.

Components needed

IC NE555

Diode 1N5815

VR 100k


Capacitors 10nf, 0.1nf, 470mfd

Give connections as per the circuit diagram given.

Step 5: Assembling Plywood & Parts

Make a plywood box & attach switches, LED & speed controller.

Step 6: Fixing Fan & Giving Connections

According to connection layout give connection to fan, pump, circuit 1 & circuit 2.

Step 7: Fixing Copper Tubes

Now fix the copper tubes in previously drilled holes. Connect each copper tube using hose pipe from pump & finally to the collection tank.

Step 8: RUN A/C

Make sure all the connections are correct, Now pour a bottle of cold water to the collecting tank & turn on the pump & fan.

WooHooo your A/c Ready...



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    8 Discussions


    2 years ago

    I think there is something wrong with the circuit, replace pin 3 with 7. And add a diod (approximately 10 amp) across motor so that if motor spins after cut off, it acts like a generator and can produce enough electrical energy to fry mosfet.


    4 years ago on Introduction

    Great and cost efficient. I love your ingenuity

    However than using cold water , can't we do something that cools naturally.

    Currently, You COOL the water using Fridge or Ice. all these require Additional power. Then you just circulate it around the fan which needs even more energy. As a result this system is terribly inefficient. Using a latent heat evaporative cooler would be much better option.

    2 replies

    Reply 4 years ago on Introduction

    Thank you for your valuable comment. evaporative cooler is a good option but it will also need pump to circulate water.


    Reply 4 years ago on Introduction

    Yes a Pump is always required. I was wondering if it's possible to Cool water and Then the Room using ONE pump. You can make a pump work like Evaporative cooler, which cools water. then the Cool water can be circulated for room Cooling.

    Using Fridge for cooling water is total waste.

    What I mean to say is, Dual stage Evaporative cooler. Where the humidiy is not passed inside the Room (Like AC).


    4 years ago on Introduction

    You shouldn't just say MAKE something. Show how you make and give dimensions with instructions to make it more clear. As it is you aren't giving out enough info.

    1 reply

    Reply 4 years ago on Introduction

    Different radiator fan have different dimensions that's why i didn't provided exact dimensions. It is not necessary to choose exact things what i used, you can make alterations with availability of parts.


    4 years ago on Introduction

    ? just use a temp censor, connected to a relay. through a auto wiper timer. then fuse it up with wiring. plus if u use a block of ice it migh last longer plus yuo'ill have cold water to drink after a well.

    1 reply