Four 200 foot wells = four tons of capacity. The power company here gave us a $250 rebate which was about .02 percent of the cost. We could have saved some by putting in a pond loop into the lake but since we don't really control the lake floor, the installer advised against this. I'm surprised there are any of these in MN, altho they're selling in Des Moines and Ames.
Yeah, there really is no reason not to put one in up in MN - all you have to do is make sure you have the right # of tons... If you're putting in a vertical loop system, that just means more wells. If you're putting in a trenched system, you have to dig deeper (I imagine you have very few of these in MN).
As for your rebate, I'm assuming you meant 2% of the cost, right? .02% would mean that the system cost you about $1.25 million. :)