Yeah, the temperature in your basement is 50 degrees. Until your equipment has warmed it up. So unless you plan on digging a vast network of pipes through the ground with a heat exchange fluid and pumps to pump it through the ground, you haven't gained anything. And of course, heat in the ground dissipates much more slowly than in the air, so you need that much more piping and fluid and pumping and electricity.
I suspect if someone runs the math, they'll find that this, like most green initiatives, is driven by imposed guilt and not practicality.
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