What are the benefits of a vertical vs. horizontal boreholes in closed loop systems?
In theory, a vertical system is more thermally stable because the temperature is more constant at 100 ft underground as compared to 5 ft underground where the horizontal loops are laid. This is claimed to be insignificant in the Canadian context. The vertical loops are more expensive than the horizontal (see question 2a). A limiting factor in the decision can be contractor availability in your area as the vertical loops require more sophisticated machinery and skilled labour. See list of contractors.
