Replies

1. 
   Guest_ | Mar 29, 1999 08:44am | #1

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   I can understand the desire to save on earthwork and since you already have a big hole in the ground, why not use it?

   If you are in a climate where it pays to spend the capital on a heat pump system, you need a much larger loop than would fit in the basement excavation. Also, when you need heat and extract it from the ground you cool the ground. So you'll be cooling the ground under your basement and, therefore, cooling your basement slightly. It's worse if you'll use it for cooling also. When used for cooling, you dump heat into the ground loop and the heat would rise up and heat your basement in the summer when you don't want it - increasing your energy costs (although is would solve the summer mildew problem).

   Make the loop long and deep (get a good estimate of the size needed). Cast a wide net while looking at earthwork options. Dozers (probably not), backhoes, trenchers, and special machines for pulling conduit through soil without digging are all options. But the best approach will vary with local conditions and availability. Let your fingers do the walking for a few hours and see what is out there. Good Luck, -David

1. 
   Guest_ | Mar 29, 1999 05:20pm | #3

   *I have shared trenches for electric and drains etc. for some of the loop. Usually more trench or a vert. loop is needed to add to it to make the total enough for the system. Shop around on the units, the price varies a lot. I found Command-Air by Trane the best price because they also make air to air heat pumps and a/c units so their component purchase volume is higher than the specialty companys.A water to water heat pump is a great heat source for a radiant floor and the chilled water can be run thru a watercoil in an air handler for a/c. If you don't use a heat pump with radiant heat of some kind, make sure the ductwork is properly designed to prevent drafts.Ron

2. 
   HARRYT_ | Mar 29, 1999 05:20pm | #2

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   this involves new constructon,can you put the closed loop exchanger in the basement excavation before back fill ?