95c466b3__And_Cooling___Thermal_Systems__Advantages
[Geothermal Loop Type] Vertical Closed-Loop [Disadvantages] Cost of drilling is usually higher than cost of horizontal trenching, and vertical-loop designs tend to be the most costly GHP systems; potential for long-term soil temperature changes if boreholes not spaced far enough apart. [Advantages] 
Requires less total pipe length than most other closed-loop systems; requires the least amount of land area; seasonal soil temperature swings are not a concern.
Geothermal Home Heating And Cooling - Thermal Systems
Advantages