DIY Cheap and Eco-friendly Air Condition Unit Concept




Introduction: DIY Cheap and Eco-friendly Air Condition Unit Concept

So i got this idea while taking a cold shower during hot summer, when i realized that water that comes from water facility is really cold. The water in my area is only 15 -17 °C during summer and i figured out an idea of how to use that to make cheap Air conditioning unit.


New/Used Car radiator with fan

Some PVC piping

A thermostat or a simple on/off switch

Power supply ( Car battery or a 12 V DC converter)

Some screws

Some cables

Mounts for car radiator and PVC pipes


Power drill for drilling holes in wall


Maybe hammer

The idea of this AC unit is that it is using Cold water from well or a local water supply facility which is cooled by ground that surrounds pipes that lead to your house/building/apartment. The key is to use that water instead of freon as a refrigerant.When the cold water is brought to the car radiator, the fan is dispersing that coldness into the air, which leads to cooling down that area or room. Constant pressure from a water source will keep the water running, so you don't need any water pumps. If the water warms up you can use it to fill up you toilet flusher or you can use that water to wash hands/dishes, or you can just use the water to water your plants or you hydroponics.

Since it is using water instead of freon gas it is making this AC environmentally friendlier, plus you can use recycled car radiator, and recycled PVC piping.

The main problem is that this AC unit is really hard to make in my country because we still use massive concrete and clay blocks to build houses. it would require to drill the thickness of entire wall ( 20-25 cm ~ 7 - 8 inches ) to place pipes that bring and drain water to and out of a car radiator. But it is relatively easy to mount it in American style houses.

This AC unit is cheap to make, easy to build, eco-friendly, and it doesn't use to much of electricity.

So this is only the concept, if you have any suggestion please write them in comments

PS. sorry for grammar mistakes my English is not perfect

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    6 years ago

    from your illustration,what make the water warm?


    8 years ago on Introduction

    Judging from your claims of summer water temperatures, you either are using well water, or you are located in a far northern city. Regular city water is only about 3 or 4 feet deep pipes, and summer temperatures are not that cold.

    I have worked on this kind of system for many years and have stopped working on it because of getting older, and have less money to do experiments. but if anyone is interested in this subject, you can take a look at my diagrams and information on website called they are mainly involved in wind turbines, but had a section for other ideas in the diary section... here is the link:

    I dug a 20 ft deep post-hole and took lots of temperature measurements at various DEPTHS and various SEASONS under the ground here in the approximate middle of the USA in St. Louis Missouri. here are my results of those years of measurements:

    20 foot depth..... temperature varies from 57 to 60 degrees F, winter/summer.

    10 foot depth...... temps vary from 56 (winter) to 70F (summer)

    4 foot depth...... temps vary from 47 (winter) to 80F (summer)

    Obviously, you must have access to WELLWATER or drill a pipe down about 20 or 30 feet to get to the good coldness and damp/wet earth. The advantage of CIRCULATING the water down deep.... then back up ... through pipes .. is that the water is very easy to circulate and only requires a TINY pump... such as a small aquarium pump that only uses ten or twenty watts! If you only pump water UP and not back down, then it requires a large expensive pump that will use a lot of electricity... which defeats our purpose of reducing electricity required.

    I apologize for "excessive commenting" on your instructable, but wish to add information which may be useful for someone who may want to take this idea further. And, you did ask for comments.


    Reply 8 years ago on Introduction

    No, i live in urban area that has a water production facility that is 5 miles from river, and its placed 2 miles away from me. That river water is extracted from deeper parts of river, and that river temperature is rarely above 20-22 degrees. The water pipes by the national regulations have to be placed 3 feet minimum(bigger pipes are placed deeper) below foundation level. Our buildings are still made with massive concrete blocks, and bricks. So the foundations are placed 10 -15ft below basement level which is 10 ft below ground level so they are placed quite deep. Summers in my country are hot and winters are cold since my city is positioned on 44 parallel of latitude. The other thing is that we have a lot of natural springs, and a lot of shallow underground water that are actually cooling water in pipes. So that brings us the temperatures showed above. One guy used well water to cool down room from 32C(89.6F) to 22 C (71.6) of course he used electric water pump. Thank you for the link i will read it. One guy in Serbia made house that is heated by heat of the sun during winter, and cooled by circulating water during summer.

    check it out, i think you can translate the website with google chrome if not i can help you with some of translation.

    So it is very possible idea. The water pump can be powered by large solar panel.

    No need for an apology, its still just an idea :D


    8 years ago on Introduction

    The concept is nice but I don't believe it is as eco-friendly or simple as you assume. Freon isn't all that unfriendly as long as it stays where it belongs. On top of that cooling/heating through phase state change is fairly efficient and crams a lot of cooling/heating potential into a fairly small area. In order for your idea to work effectively you would need a constant flow of a good bit of water. Now if you are out on a farm with an artesian well and a good use for the waste water (irrigation) then it's not such a bad idea and would require very little outside power. Any water source that is not under pressure would have to be pumped. Pumping take power, typically electrical, which comes from the power company which typically burns coal. In the city you are basically going to be throwing away water that you pay for. Plus the sewer charge which is calculated from water use.

    To avoid just dumping the water you could use a large underground tank that you could fill and recirculate the water through. But now we are talking about the impact of producing the plastic for the tank, excavating (typically desiel runs earth moving equipment) deep enough to keep the tank at a constant temp .

    You see where I am going? When people claim something is eco-friendly they rarely look at the actual "footprint" of what they are talking about. Electric cars, solar, etc. None of them are really all that green. In the case of the car it just hides the "ugly" stuff from the end user.


    Reply 8 years ago on Introduction

    No im not on a farm, its urban building, but pipes are really deep, and the water is comes form the river water thats rarely heated above 20 C. Of course wells gonna need water pump, and if you use solar panel or a wind generator to power the pump its gonna be far from cheap. You idea of water thank is very good, but like you said its not very green, but my father, his brother and his father dug up with shovels a water accumulation tank that is 2.7m3 . it took time because they didnt have money for equipment. The green thing is that you can use radiator from scrap yard, and when its gone because of corrosion you can take it to recycling facility. The thing is that as the most of the home appliances is made in china, transferred by a massive container boats to its mother company to be packed and shipped world widely by again container boat, to be transported by big diesel running trucks to the store where you can buy it. If you try you can make this project by the stuff that is made in you area/state/country. About the cars i heard that nickel for batteries for hybrid cars is dug up in Canada, refined in China and packed in Japan to be sold. And its again shipped by container boats.