Half a croissant, on a plate, with a sign in front of it saying '50c'
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Sinktop Air-Conditioner

Water your lawn while air-conditioning the house
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Municipal water is cooled variously to 60-70degF for transportation to consumers.

The "MyGodYou'reACheapass" sinktop air-conditioning system is a large radiator that plugs into the cold-water tap. A fan blows room air through the radiator, cooling it to the point where the effluent water is at ambient. The water then flows into an outdoor tank used for watering the garden or lawn which will be happier with non-cold water.

Flow control is via two opposing bi-metal strips and the fan is powered by the water pressure, supplemented by wallpower as the temperature difference (and thus the water pressure) gets smaller.

FlyingToaster, Feb 05 2009

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       //the fan is powered by the water pressure//   

       I wonder if that same principal could be used to turn a fan by using the flow of water into a cistern. The only thing remaining would be a delay mechanism and a trigger of some sort.
bigsleep, Feb 05 2009
  

       There's a shower exhaust fan available from the Rainbow Power Company in Australia which is powered by the running water in the pipes.   

       This should work. Unfortunately here in Oz we're experiencing extreme water shortages and restrictions, which means watering gardens with tap water is banned in a lot of places.
BunsenHoneydew, Feb 08 2009
  
      
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