What a ground-source system costs and why

How much does a geothermal heat pump cost in Canada?

Nobody can give an honest single number, because the price is built from three separate jobs: the heat pump itself, the ground loop, and the work inside the house. What can be said is the pattern. A ground-source system typically lands well above an air-source heat pump of the same capacity, and the gap is mostly underground. Ranges quoted by contractors move with drilling markets and equipment prices, so any figure printed in a guide, including this one, ages quickly.

For a ballpark you can trust, collect two or three written quotes for your own house. The comparison with a cheaper option is covered in air source vs ground source heat pump, and general heat pump pricing is in how much a heat pump costs in Canada.

What is inside the quote?

A complete quote has four parts, and it helps to ask for each one as a separate line.

• Loop field: drilling or trenching, pipe, fluid, grouting, header piping and the trench back to the house.
• Heat pump unit: the indoor equipment, its size in kW or tons, and the controls.
• Distribution: existing ducts, new ducts, or hydronic floor loops and a buffer tank.
• Extras: electrical service upgrade, permits, commissioning, hot water integration and site restoration.

The loop field is often a large slice of the total, frequently a third or more, though the share swings with ground conditions. Hard rock, high water tables and tight access all push drilling costs up.

Why does the loop cost so much?

Because it is civil work. A vertical loop needs a drilling rig on your lot, and the driller is paid for metres drilled, so a house with a high heating load needs more metres. A horizontal loop skips the rig but needs trenching over a wide area. Both options are compared in horizontal vs vertical ground loops.

Loop length follows from the heat load. A leaky house needs a bigger heat pump and a longer loop. Spending on insulation and air sealing before the quote can shrink both, which is why an energy audit often comes first (see home energy audit in Canada).

Does a bigger upfront price ever make sense?

Sometimes. The Drake Landing neighbourhood in Okotoks stored summer heat in 144 boreholes of about 35 m each, and its borehole storage field shows how much of a ground-based system's cost sits in the drilling. That project was a community-scale experiment, not a pricing benchmark for a single house. For a household the question is simpler: will lower running costs over a long equipment life offset the premium? That test is worked through in are ground source heat pumps worth it.

How should you compare bids?

Ask each contractor for the design heat loss they used, the loop length, the heat pump capacity, the fluid and the expected efficiency at your design temperature. Two bids with very different loop lengths for the same house deserve a conversation. Ask who holds the warranty on the loop and on the drilling. Then check current rebates and loan offers, since they change the net price; see geothermal rebates and financing.

A worked comparison to bring to the table

Here is a made-up illustration of how to read two bids. Bid one has a 5 kW unit with 400 m of vertical loop. Bid two has a 7 kW unit with 300 m of loop. The second looks cheaper in drilling and dearer in equipment, yet it may also hide an undersized loop or an oversized unit. Neither can be judged until each contractor shows the heat loss figure behind it. Matching the equipment to the house is the same issue covered in heat pump sizing for cold climates.

Also ask what is excluded. Electrical panel work, trenching back to the house, landscaping repair and removal of the old furnace are common extras. A lower headline price that leaves them out is not a lower price.

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