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If you're talking about a metal tank, you're probably right, but I assumed you were planning on a plastic tank. It might be a good idea to do some testing before you go to all the trouble of installing this big tank in the ground. I'm just afraid the amount of heat removed from the house is going to be more the the ground can remove from your water and then your efficiency goes down the tubes. In commercial systems they use the compressor to increase the temperature differential between the medium (water in your case, but they usually us some sort of antifreeze) and the ground, but that's so they don't have to use a reservoir like you're doing.
Good luck.
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