Half a croissant, on a plate, with a sign in front of it saying '50c'
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Passive air exchange

 Pass air intake through an undergound coil to temper air
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If you could "bury" a coil of duct for the make-up of your home ventilation a few feet in the gound, it would cool the outside air in summer and warm it in the winter. This would probably cut down on the utilities.
—dt, Apr 29 2003

(?) Baked http://www.armstron.../heatrecovery.shtml
took about 2 minutes to find. [ato_de, Oct 21 2004]

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       Good idea. Unfortunately, I think it's baked, isn't it?
—beauxeault, Apr 29 2003
   

       I can't be bothered to google it, but it is baked, sorta: the systems use water rather than air. You need quite an impressive length of tubing under the ground at a depth of (if I recall) a couple of feet at least. But it works and is commercially available. I nearly bought one.
—moomintroll, Dec 06 2005
   


 

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