In Ontario (and across Canada) horizontal ground loops are employed in the majority of all ground source geothermal installations. A long trench is excavated to a depth of 5–6 feet (approximately 1.8 metres) and HDPE pipe is laid in the bottom of the trench, positioned across the width of the trench and then the trench is backfilled. Ask about restorative landscaping options.
The horizontal loop format is commonly used since it is the most cost-effective method of installing the pipe into the ground. Well designed and installed it will deliver many years of reliable service. Typically the property should be at least 1 acre in size with a relatively flat area available that is unobstructed by trees and bush, landscaping features, a pool or a septic bed area or any protected natural areas on your property.
Please review this short video to get a better understanding of the requirements for excavating a horizontal ground loop.