[rescue] SGI Challenge Resurection (was : More Indigo Problems)

[Sheldon T. Hall]

Dan Duncan says ...

> Has anyone played with ground source heat pumps for heating/cooling?

I've look into it.  Expensive.  You need many, many feet of pipe, deep in
the ground.  IIRC, just to A/C my 1,500 SqFt house in Atlanta, it was 200 Ft
of 2" pipe, 5' down.  The heat exchanger was much more than the typical
residential heat pump, too.  I think the whole deal was going to be 3 or 4
times the $3,000 it cost to replace the gas furnace with a "regular" heat
pump.

But that was just regular residential use.  If you want major datacenter
sized cooling, it's probably a completely different deal.

-Shel