This method is where air or water or some other transfer system is piped into the ground and cycled through the natural temperate earth and back out. This allows the air/water to come out warmer in the winter and colder in the summer and boost the efficiency of whatever pumping system you're using in your home. When you're cycle air/water that is within 20 degrees of the interior temperature as opposed to the air that is 50 to 100 degrees different outside of the home, it boosts efficiency by 400% in many cases.
There are a couple of methods also, one has pipes run horizontally a few feet underground for a few hundred feet or so and the other involves drilling deep for more stable temperatures. However, drilling costs a bit and may not be worth the money you'd spend on a residence... it's more efficient for businesses that would be around for a while and would benefit from the cost savings more quickly.
Cost break down:
Installation with heat pump unit: $6,500 (average home)
Drilling/Digging for a vertical line: $20,000 (averaged, varies on ground type)
Yearly Cost Savings: $861.84
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