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From: PlanetGreenTV
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  • how does the water magically move through the piping? do you just will it to move?

  • my tap doesn has a button for ice col water ... and the watter in the barrel doesnt stay cool myth busted ! ;D

  • or just use a fan

  • Very cool

    To see more innovative videos like this or want to share your own ideas visit ThinkStageDOTcom

  • So, where do you get the ice water from? The freezer? Cooling water in a fridge produces heat. In fact, you will always be producing more heat than you can cool using this method. So not only is this waste of electricity NOT "green", but you'll be heating up your home!

  • BETTER OF THE ALL

    Jump in that ice filled garbage container to cool yourself down fuck the room and be "green"

  • spend on the ice, not the ac

  • Moron people and a moron system....

    Electrically speaking - I doubt they could get past battery operated dildo's.

  • Yeah great idea having a big container of water near the ELECTRICAL SUPPLY!

  • i will cover my house in a giant white bubble with copper tubes running in a zigzag all around with cold water running through it? this energy eff? or "Green" enough lol

  • thats so dumb you'll be paying just as much money on water then on an ac lool

  • WTF?! Suchin Pac!!!

  • as a poor college student in a house with no ac. i dont really fuckin care if this is green or not. just get me someinthg that can cool my house without me spening money.

  • it's not totally green, ok, but if it's hot & your ac is broke or nonexistent, then this is a great idea! Pumping cool water from below ground would be more green and cost effective especially if the pump is run from pv solar duh

  • Ok, ....so were does the ice come from? If it comes from your freezer, the net effect is that more heat is added to your house. Of course if you bought the ice at the store, it would actually cool your house, but the cost will probably be higher than running the airconditioner.

  • just buy aircon you cheap people

  • Since "This show clip is more about making stupid people waste more that does less." I can't help but believe that it is more about making people feel that if something can not be done "GREEN", it is bad and the person is also bad. As I said, "I WILL TURN ON MY AIR CONDITIONER", I will pay MY BILL and do not ASK FOR GOVERNMENT ASSISTANCE. The more "GREEN" is forced upon me, the less I am inclined to try to save anything but my money. I WILL NOT PAY EXTRA FOR "GREEN"! I will fight greenie weenies

  • This green shit just isn't practical in most situations. If there's cool water where you are then the air is probably cool. If you have to pump the cool water, then it's not efficient unless you pump it yourself. If you were hot before you pumped it, you will be real hot after you pumped it. This design will produce very LITTLE heat absorbtion. This show clip is more about making stupid people waste more that does less. I'll turn on my Air Conditioner & leave "GREEN LIVING" to SOME ENVIRO IDIOT.

  • I WOULD ADD A SMALL WATER COOLER TOWER maybe with some of it below ground where the temp is cooler, spray it from the top and let it fall down the shaft as rain, maybe even trickle over some radiators with the warm water coming back from the house.

    it'll cool the water on the return cycle and then as it falls it cools even more.

    I'm kinda kicking the idea around about building one.

  • and the ice they are buying is made with electricity from a coal fired generator

  • turn on the AC , just DIY

  • Absolutely makes you sick to see a so called "green" supporter load their videos with ads. Dumbass is just as bad as anyone who claims Global Warming isnt real.

  • @iBoy2G they are green as in green in their pocket.

  • Kinda reminds me of the smaller fans that we use for our Dogs while we travel .. we attach frozen ice rings to the front of their fans that are attached to their traveling crates ... BUT it is ONLY temporary ... for several reasons .. We have to make sure to always have Frozen Ice Rings ready every so many hours ... Ahhh. . but here's the rub ... So far in today's world, we make ice, or refreeze these plastic rings in a Refrigerator... which is plugged into Electric ....which is not in our car!

  • time slot filling dribble like this makes me disappointed in human intelligence..

    ...also shames me as a human...

  • Here's an idea, instead of making ice with electricity why don't you just bury underground copper tubing where it is already cold and fill it with water and let it come back into your homemade ac and circulate using a pump with a small fan. then you would not have to worry about humidity and freezing ice!

  • @MrTony747 My thoughts exactly.

  • @MrTony747 Your mom underground.

  • @warrkrymez

    Your face underground.

  • How is this green? You use power to make the ice and use the fan. You have to open a window or door or cut a hole in your wall to get the tube to go "outside" as they say. Then they say "no waste" umm... hello your wasting your time energy money power and WATER. Also the copper pipes are probably not efficient at heat transfer to air in a short time. I bet the water only drops a few degrees before being wasted. So, its inefficient as hell. But you do FEEL green that counts right?

  • @cydonia21 I think its saying it's greener than an ACunit

  • G word show people need to get real. This is a waste of time and effort. Find a shady tree and stop wasting peoples time

  • its bullshit

  • where is number two? haha. i built one of these and i did not notice a difference. yes I put ice in the water.

  • These types of setups work better with a cooler and a pump running the water through coil and back into the cooler, ideally with a closed circuit for the fluid running through the coil which would be some sort of coolant or heavy salinated water with a another coil in the cooler under ice. You could use a cheap fishtank or water fountain pump to move the fluid through the coil.

  • u should used a termometer

  • The worlds first 1% EFFICIENT 100btu. Garbage can air conditioning system. Only $19.95 Plus $10 shipping and handling. Our first 100 callers will receive our pat-tended insulated garbage can lid free of charge. Just add $5 Additional shipping.

  • Run cold tap water into coil and then down the drain?

  • at the rate you would need ice your better off just opening up your freezer and putting a fan in front of it...........FAIL!!!

  • That is a good idea, but you would be so busy refreezing the water so it can be reused.

  • This contraption would be a pain to move around, and takes up a lot of clunky space. By the time all the products are purchased, your cost is about $125.00, makes 'no sense' . Not to mention a vehicle large enough to haul your 'clean, new' purchased trash can, A styraphone cooler seems much more practical not as ugly, Covers about the same area. My choice buy an evaporative cooler on line for about the same price.

  • it will fill HUMIDITY in the room .

  • @nadeem5476

    I beg to differ. The AC works in the same manner. It would not increase the humidity but rather reduce humidity as the cold air blowing across the tubing would cool down to produce water vapours condensation (just a like around a glass of cold water). This water can then be collected in a bucked and moved outside for evaporation into atmosphere. As the process does not involve evaporation of circulated liquid therefore the humidity level would reduce rather than increase.

  • @nadeem5476 no it does not, it remove humidity. water vapor condenses when it comes in contact with a cooler surface. In fact this is the EXACT same way an air conditioner works minus the refrigerant and the compressor. This is why after a hot shower the water is on tile walls. The walls were cooler and the water vapor condenses.

  • @nadeem5476

    the water is inside the tubes, and the one in the container will not evaporate

  • @nadeem5476

    It actually will decrease the humidity in the room. The moist warm air condenses on the cold copper. You are speaking of a swamp cooler. This is not a swamp cooler.

  • @nadeem5476 the water never exits through the fan, it just works through the tubing so it won't create more humidity than a bucket of water would

  • goma3 is a noob, I made one and it works fine, it aint no 50000BTU A/C but it does cool down a decent sized room if done right. I love it when uneducated noobs post trollish comments =)

  • @maiky3838 hahaha I completely agree! For one reason....

    "Anybody who studied Thermodynamics 101 would see that this system is complete baloney." - goma3

    Anybody who studied Thermodynamics should be able to spell Bologna correctly? It still doesn't seem like it would work IMO. And for people who think you would make ice in your freezer why not just go buy a couple bags for a couple bucks and call it good.

  • Lets Fire it up...! LMAO

  • What happen to Planet green channel. it sucks. it's all cocking shows

  • You would save your time and space if you just bought a 150 dollar air conditioner at walmart.

  • It works better if you put the coils on the front

  • Seriously everyone?! You don't have to freeze your own ice! If you're saying that too much heat will be produced by the fridge trying to produce the large quantities of ice cubes, get off your lazy butt and buy ice from your local convenient store. Usually it's pretty cheap. If not, well, sorry.

  • @TheJauntyJester exactly, buy like 4-6 bags, you would be good for 2 -3 days.

  • this is a joke? and you call this eco friendly?

  • @pedrinmarrentin:

    I don't use the "H" word that often, but I really hate that show... they give the "G" word a bad name.

  • Interesting! What if you use ice from outside (from a natural cave, for example) - this might work for mountain huts or farms in some areas or such?

  • Anybody who studied Thermodynamics 101 would see that this system is complete baloney.

    The key here is the energy used to make the "bucket of ice" lol which would always be way higher than the proposed cooling by the fan, not to mention you need some heavy-duty ice maker to even get remotely cold!

    Then the heat produced by the ice maker is way higher than whatever cold you get from the fan.

    AC don't cool the air, they reject heat to the outside. That's the key and there's a BIG difference.

  • or you could just open you fridge and put the hot end out a window

  • you can't keep watering plants they will drown

  • GAYNESS AT ITS BEST!,....THANKS TO THIS EVERYBODY NOW IS AT LEAST 10% DUMBER!!!!!

  • Just spend $200-$300 on a normal window unit. Simple, effective and actually works.

  • You could also get a motorcycle helmet two sizes too big and fill it up with ice cubes and put it on your head.

  • @hawkermustang You made a funny

  • best to use frozen soda bottles in ur water and use an aquarium pump to pump the water thru the copper tubing and return the water to the garbage can..use a trash can lid....just cut a hole for the out tube and a hole for the return tube in the lid..I'd use a pan under the trash can to catch the condensation..u could fill the trash can and that should last for a long time

  • It's amazing how stupid people are about science in this world. To all the dumb shits: heat has to be removed from the house. this system does not do that. In the long run the house will end up hot.

  • WOW!!! they really fucked up a pretty decent idea. Why are they using a trash can? and why is the copper around the back of the fan? they did a really horrible idea of explaining this. There is a better video on this on here. this video sucks dinosaur balls... EPIC FAIL!!

  • this is a cheap alternative solution for somebody on a budget in terms of initial outlay

    this is NOT green - eco hippy fail

  • why dont you just put your damned refrigerator ( with its door removed) inside your room ? so youll have a refrigerator and an airconditioner at the same time

  • Comment removed

  • In a word... "retarded" .. Planet Green what about all the wasted water? Attach a water pump and recirculate the water. Think of the "carbon foot print" (Anthropogenic Climate change is a nothing more than propaganda perpetrated by the Globalists, UN needs a revenue of income so they are pushing CO2 Tax) of the water treatment plants.

  • Totally impractical , don't even try this as you would be wasting copper tubes.

    i have made fool of myself by trying this.

  • Cost of Fan: $25

    Cost of Copper Tubing: $30

    Cost of Trash Can: $45

    Cost of Plastic Tubing: $15

    Paying $115 for a piece of shit DIY AC when you could've bought an energy save window AC for $100....idiocy...i mean priceless

  • @sabriath Who the FUCK spends $45 on a trash can?????

  • @fhantazm : Thanks for being retarded. My 12 gallon trash can cost me $12 at walmart.....THAT trash can looks like a 30 gallon possibly (not very good at visualization). Copper tubing isn't $30 either....and the AC energy save unit I bought from walmart was only $60. So why don't you stfu and just leave it as a joke.

    I mean if you REALLY want to spend all that time and money on something that may drop your room 2 degrees, fine, go at it.

  • @sabriath: Calm down, little boy. Take a little breather and then ask your mommy to up your medication.... Now to address your incoherent response, nothing in your initial post alluded to being any sort of joke whatsoever. You started pulling all sorts of odd numbers straight out of your ass and I simply called you on it. But nice cover up! I also never said anything about the homemade AC being worth the time or money, so I'm not quite sure why you decided to ramble on about that as well.

  • @sabriath In other words, if you want to try to impress all the little kidlets here on YouTube, you can start by at least knowing what you're talking about. Just a suggestion. ;)

  • waste of money and time

  • I just took my shirts off and dunk into a tub filled w ice....this is not for me...it is so damn geek toy...

  • Good Idea when the power goes out and you have only a small generator.

  • Here's a better solution, save up your money & buy an air conditioner portable/window/fixed, its cheaper in the long run & doesn't make you look poor when your friends come over

  • U can water your flowers with it! LMAO!

  • How is this green? It takes more energy to make the ice then it would to run an air conditioner. If you buy your ice at a store, the freezers there have to work to keep the ice cold after the ice is made. You also have to worry about all of that water causing mold problems.

  • add a smaller tub that will fit into energy efficient refrigerator, and return water back into tub, will stay cool, works great in my garage, dropped temp 15 deg

  • You got it Wrong

    The return tube is suppose to go back into the "trash can with ice"

    Only after ALL the ice is gone then you can use the "return tube" with the pump on to pump out the water,.....to water the plants.

    Or you can just not use ice and the copper tubing will get cool on it's own...from the windNcycling water.

    Only if you use a smaller "trash can" I would rather you use a ice cooler and poke a few holes in.

    That way the water slowly gets colder.

    If you want. Like the show anyhow.

  • Stupid Idea

  • What it cost to make ice,is more than the cost of a small window air conditioner. Why don,t we all go back to living in caves? This is both stupid and ugly ,and I promise you will never use it a second time! I am a State Licensed hydronics specialist, I know what I write about here.

  • let me tell you if the bin full of water is at room temp it will blow room temp air. If the bin has ice in it, it wont take long until the ice melts and gets to room temp. How do i know this, i made one years ago and it dont work

  • what a fkn load of shit

  • G SPOT

  • the whole bucket of ice water is false economics and isn't a great idea unless you plan to only very infrequently use it.

    it wouldn't take much to rig up a evaporative cooler element instead of the water bucket.

    however the basic plan has been used for thousands of years. ancient iran used this basic principle using subteranian water cisterns that had very cold water in them. the worlds first air con.

  • @stupidnamenoonecares

    "it wouldn't take much to rig up a evaporative cooler element"

    That sounds interesting. Do you have any links on it, or suggestions?

  • well. upon some reflection it would still be doable but probably cheaper just to buy one.

    however if your keen, you need more plastic tubing another fan, another roll of copper and a water drip system. the fan goes outside blowing air over the tube that has water dripping on the copper. using an absorbant pad hard up against the copper pipe which still allows air to pass through would help a lot.

    too much work for an inefficient system though.

    google swamp cooler for info on how it works.

  • Another green bullshit.

  • Even better yet add a thermoelectric cooling module to keep the water cold and recycle water in the system. use a well insulated box to hold the water and you could probably get by with just a gallon of water kept cold by the module and recirculated through the system.

  • how dumb, may as well just go into the ice bucked that way you don't use any electricsity :)

  • I like this idea even if it only lasts for 3 hours. In the long wrong you save big money. So instead of paying 300 to 400 a month to the extortionist pigs from the power company and the government we can pay maybe 70 to 80 bucks for a fan and maybe about the same for copper tubing and about 35 gallons of water coupled with a standard submersible fish pump. This would work for me:) Maybe we are still using electricity but lets get real about it. It's way less and that is just fine with me.

  • A much more efficient system would be to simply build large heat sinks into the home in the first place, powering them with solar or if you live in a windy area then orient the heat sinks to take advantage of that wind. In the colder months cover them up.

  • heat sinks cannot cool below ambiant temperature. they can't cool your house if it is as hot as outside.

  • I am not a physicist so my knowledge about this is limited. But I do have a heat sink refrigerator that runs about 25 degrees F colder than room temperature. I am assuming you define ambiant temperature in this case as room temperature (about 70 degrees F).

  • i would suggest that there is more to your device than a simple heat sink.

    the ambiant temperature is the temp that the heat sink is trying to gain equilibrium with. generally room temperature.

    perhaps it has an evaporative component?

  • It stopped working a while back so I had to repair it (bad fan) and completely disassembled it in the process. The components are as follows: One insulated cabinet with matching door; one heat sink; two fans, one inside blowing onto the heat sink, one outside blowing away from the heat sink; one small control boar; one power cord. There is no evaporater. Inside temp is approx 45 degrees F when room temp is 70.

  • it almost certainly has a peltier device between the two heatsinks. that or your breaking the laws of physics. :P

  • well I did say I am not an expert in physics. To tell the truth I did not disect the heat sink but it did look as though it was a solid piece of aluminum and just one piece not two. But I could be wrong. btw, what is a peltier device?

  • a peltier thermocooler is a nifty bit of technology that uses electricity to send heat from one side of the device to the other. it would be about 1.5 inches square mayby and 5mm thick. it's very inefficient but solid and compact. good for mobile lightweight uses, camp fridges etc.

    temp differences of around 50-60c can be achieved. they can be used for heating also, you might have seen usb coffee mugs that keep your brew warm.

  • it sounds like that requires electricity to work. I traced the wiring and the only wires are the power going to the board, the wire going to the switch and the wires going to the two fans. The heat sink seemed like one piece to me when I disassembled the fridge and there were no wires going to or from it.

  • well then your breaking the laws of physics.

    don't worry your not alone, people break them all the time without even knowing it. :)

  • This will work but you have to cool the water first for this system to work and doing that uses electricity. Perhaps. An environmentally friendly system would use solar to turn the fan and pump the water. The water would be pumped from a well where it is naturally cool then exhaust into the garden or other use.

  • get a $2.50 bag of ice

  • why dont we all just cut a duct out of our freezer and hook it up to a fan....thats what this basicly doing

  • put solar panels on top of your house or garage and then you won't have to worry about the cost of using your ac, execialy if you have a energy eficient one.

  • ridiculous, i had a ten gallon can filled with ice water and it lasted me more than twenty four hours, how the hell is it going to last less then that, don't put so much water; how much does the damn tubing hold...and as for the excess water just put it pack in the freezer and use it when you have it frozen

  • So every 1 to 3 hours to the store to buy $20 worth of ice to put in the 50 gallon garbage can in your front room? Then empty the melted water every few hours?

  • talk about trying to reinvent the wheel, this method is not practical nor intelligent, a conventional air conditioning unit is much better than this half baked system, they say no waste? really? what about the energy spent to freeze the ice? what about the energy used by the fan? i would like to tally up the energy spent here, i would bet anything it uses about the same amount if not more energy than the conventional AC unit, but with a tiny cooling benefit, this alternative is very wasteful

  • i couldn't have said better myself

  • instead of water use liquid oxygen

  • They used copper for it heat properties as the copper allows the heat to transfer from the room into water quickly, and water has an amazing ability to hold a large amount of heat.

  • ha, you need an a/c to make that ice, this fails at life

  • well if you have a fridge like most of the planet then you should be ok.

  • I wonder if they threw rock salt into the water to drop the temperature.

  • good call!

  • Keep the water in an outside loop rather than spending it once. (no coper outside) It should be a half buried fountain pool or at least recool it by letting it fall. Filters are also needed.

  • Plans from the internet, yikes. The bomb that I tried to make with online plans blew up in my face. I lost my right arm, right leg, and my left hand, oh and my torso

  • i like it wen shows fuck up on diy's wen its so obviosly not gona work like that

    for example the water will heat up cause ur soposed to have ice water coming from a cooler and fed back into it so it lasts wayyy longer

  • just seems unpractical. pumping or lifting that much water to last for an hour or two. good to demonstrate the process. maybe if you could lower the pressure of the water so it would evaporate at a lower temp. use less water also. but it would also be eco friendly to hire some out of work fatso to turn a wheel on a real air conditioner. good for the economy, less fat people, no wasting of water

  • It is beter to use a insulated container

  • well not if the container sits in the area that you are cooling as it will not make any difference to the net cooling effect

  • The energy that is used to cool down the water, if from the freezer of fridge, would be much greater than even using conventional air conditioners and in California and places where there are shortages of water, it'sn't practical. This in not environmentally friendly or that practical. These hypocrites fail.

  • quit being so critical ,its a science experiment

  • Not ecofriendly in the slightest. The air may cool down in the process as the water from the ground (and city) in most always colder than 80 (as low as 30s in areas). Water has a heat capicty higher than most other substances and heat comes from the surrounding environment. Now it is warm. Where is the water going? Are you drowing plants so that you can stay cool? I hope you are not drinking it cause it is toxic because the copper is going to leach.

  • really the copper is going to leak? it is unbelievable to me people make comments with no knowledge.lookin your wall dummy your plumbing is made of copper,if you didn't know that why would you comment??????????????

  • True(water from)the ground is most always a constant temp, that is why people who have room (underground) and/or money often buy geothermal heating/air. Please provide reasons you think that setup is (or not) ecofriendly because this reeks hipocracy in my eyes. Experiment, but not useful, no.

  • The comments about the freezer working harder to make ice cubes doesn't make sense. Last time I checked my freezer runs no matter whether it is making cubes or not. Putting the water back into the garbage can makes more sense than the plant.

  • stuped

  • Better off spending $150 and buy a small window air conditioner, which will work tons better than this contraption and much less hassle.

    Cool idea, but not very practical. Especially when you consider that you're actually creating more heat as your freezer has to work harder to make the ice, and that heat is expelled into the house unless you keep your freezer outdoors.

  • Unless you buy bags of ice from the grocery store. lol

    The whole idea of having a huge garbage can filled with water in the middle of your room why watching tv is like yeah kinda weird. o-o

  • dumb idea the freezer will expell more heat and use more hydro than the ice it makes can cool off or be efficient duh....

  • @beastofblurdon not everyone has refrigerated air so what to do?

  • terrible idea but better then the PlasmaCool

  • This is actually a pretty cool idea, though why not put the water output back into the water source(Trash Bin)? Less water would be better too, the copper would be able to keep the water colder for a longer period of time, right?

  • If this is supposed to eliminate the use of CFCs or HCFCs, then you forgot that the ice cold water has to be refrigerated by something that uses one of the two ozone depleting gasses.

    And the fan uses electricity.. so I see no gain for the planet here..

  • 1.- U will eventually finish the water

    2.- u will kill a plant with all that water

    3.- u have to refill it

    4.- Duhhh

  • This is a terrible idea:

    1: How do you get the "ice cold" water in the first place?

    2: At the rate it expels water into the garden, it won't be long before you have an empty bin.

    3: Who wants huge volumes of water pissing out the house in just one spot where it will not exactly have desirable results?

    4: Even if this were viable, what about the cost of all that water?

  • 1) Take regular water with shitload of ice and stir until cold.

    2) Good point

    3) Most legit A/C systems have a hose connected to a drain.

    4) Got me stumped again.

  • ice duah....lmao

    2. last about 3 hours

    3.water used to cool the copper......

    4.cost of water? lol? umm 20 bucks a month for unlimmited amount of water is costly?

  • Okay ps3man75:

    1. Of course you would put ice in water, I was assuming that anyone who read my comment had the brains to look deeper into it and realise for themselves that this system relies heavily on getting "ice cold water" in the first place, meaning you have to freeze a shit load of ice. Now, read deeper into this, as producing ice makes your compresser work harder, which creates more heat. Think on.

    3. What? Have you read this?

    4. Unlimited supply? LOL - gotta love that thinking.

  • l0l well dik about ur fridge but i know that my fridge makes the same amount of ice everyday so it doesnt rlly work harder to make more ice.

    and btw this homemade fridge isnt industial size rofl

    its a fun project anybody can do... l0l

  • @ArcanePath360

    my refrigerator is idle 90% of the time, ice is free in a normal house, you pay the same bill if you make ice or not

  • @harckez it may be idle but placing water in the freezer or taking ice out (where your freezer automatically makes more) Still costs energy to turn that new water into ice.

    It may not seem like it but putting a bucket of water in an freezer does warm it up and the freezer will need to flip into action faster to cool it in response.

  • @harckez

    If u make ice in the fridge, u pay alot more in electricity.

    Making ice for this "green" system, probably cost more than running a conventional airconditioner. Not a good idea.

  • @ArcanePath360 wait wheres nr 2?

  • Yeah but... how can i get that ice cold water?????

  • excuse me...but electricity + water = DEATH!

    never connect an electrical device (fan or whatever) with water!

  • LOL you are a dumbass. What do you think any a/c unit is? Fluid + fan

    The fan is not touching the water at all, neither is the electricity.

  • lol ahahahah good point

  • I don't know if I am a dumbass.

    All I know that regular airconditioning is made by PROFESSIONALS with computer controlled robots in a high tech factory.

    not by do-it-yourself geeks like you, me or them TV hosts

  • not to mention bud an water pump sits in water lol

  • yeah you obviously don't understand that the copper and vinyl tubing insulate the water from the electronic parts of the fan, this is perfectly safe.

  • Comment removed

  • thats great but if you want the real thing get a big box fan and put a car Radiator infront of it and you got goddam good cooling man ! and the pump should be like 1/20 hp or more like 1/8

  • just siphon the water like they did on the vid .... no pump needed!!!

  • you can siphon the water only if the container is higher than the fan... and however, the water must return in the container...

  • Oh ya, that'll look real nice in my living room. Now, where can I get the free electricity to make the ice and run the fan?

  • just put it back in the trash can were the water in that way it cycles...

  • An aquarium pump should allow the water to recirculate in a  closed-loop system.

  • Actually, you could probably make a better A/C unit from an old refridgerator's cooling coils