A ground-source (geothermal) heat pump typically costs roughly $30,000 to $60,000 or more to install in a Canadian home, about two to three times the price of an air-source heat pump. In return, it delivers very high efficiency year-round because the ground a couple of metres down stays at a fairly steady temperature, even when the air is -30°C. Payback can range from under 10 years to more than 20, depending on what fuel you're replacing, your property and your local energy prices.
Key takeaways
- Geothermal heat pumps use stable ground temperatures to heat and cool with seasonal efficiencies often around 3 to 4.
- Installation is expensive mainly because of the ground loop: trenching or drilling.
- Payback is fastest when replacing oil, propane or electric resistance heat in a large or rural home.
- Ground loops can last 50 years or more; the heat pump unit typically lasts 20–25 years.
- Cold-climate air-source heat pumps have narrowed the gap, so compare both options carefully.
How a ground-source heat pump works
Below the frost line, ground temperatures in most of southern Canada stay roughly between about 5°C and 10°C year-round. A geothermal system circulates fluid (usually water with antifreeze) through buried pipes called a ground loop. In winter, the fluid picks up heat from the earth; the heat pump concentrates it and delivers it to your home through ducts or in-floor heating. In summer, the process reverses and the ground absorbs heat from your home.
Because the heat pump always works from a mild "source" temperature, its efficiency doesn't collapse in deep cold the way an air-source unit's does. See our geothermal page for a broader overview.
Types of ground loops
| Loop type | How it's installed | Land needed | Approx. relative cost |
|---|---|---|---|
| Horizontal closed loop | Pipes laid in trenches about 1.5–2.5 m deep | Large yard | Lower |
| Vertical closed loop | Pipes in boreholes often 50–150 m deep | Small footprint | Higher (drilling) |
| Pond or lake loop | Coils sunk in a nearby water body | Access to suitable water | Lower, if available |
| Open loop | Uses groundwater from a well, returned to ground | Good water supply and approvals | Varies |
Rural properties with room for horizontal trenches usually get the lowest cost. Urban lots generally need vertical boreholes, which raises the price significantly. Open-loop systems may require provincial water approvals and depend on water quality.
What it costs
All figures are approximate Canadian ranges for a typical detached home:
- Ground loop: roughly $15,000–$35,000+ depending on type, soil and rock, and home size. Drilling through rock is the costliest scenario.
- Heat pump unit and installation: roughly $12,000–$25,000.
- Ductwork or distribution changes, electrical upgrades: varies; can add several thousand dollars.
- Total: often $30,000–$60,000+, higher for large homes or difficult sites.
Some systems also preheat domestic hot water with a "desuperheater," trimming water heating costs.
Estimating payback
Payback compares the extra up-front cost against annual savings. A simplified approach:
- Estimate your annual heating and cooling energy use from past bills.
- Estimate annual cost with geothermal, assuming a seasonal efficiency of roughly 3–4 (three to four units of heat per unit of electricity).
- Subtract to get annual savings.
- Divide the cost difference (after rebates) by the annual savings.
Illustrative scenarios (not predictions):
| Replacing | Typical savings potential | Payback tendency |
|---|---|---|
| Heating oil or propane | High | Often roughly 8–15 years |
| Electric baseboard | High | Often roughly 10–15 years |
| Natural gas (low price) | Low to moderate | Often 20+ years, sometimes no payback |
| Compared with a new air-source heat pump | Modest | Long; depends on climate and site |
Your actual result depends on loop cost, rebates, energy prices and how much heating your home needs. Reducing heat loss first, through air sealing and insulation, lets you buy a smaller system and a shorter loop. Our whole-home upgrade sequence explains the order.
Geothermal vs. air-source heat pumps
Cold-climate air-source heat pumps have improved dramatically, which has changed the comparison:
- Geothermal advantages: higher and steadier efficiency in deep cold, no outdoor unit to keep clear of snow, quieter, very long loop life, less reliance on backup heat.
- Air-source advantages: much lower installation cost, easier to retrofit, no excavation or drilling.
In regions with very cold winters and high heating loads, like much of the Prairies and northern Ontario and Quebec, geothermal's steady performance carries more value. In milder regions, air-source systems often deliver most of the savings for far less money. Our heat pump vs. furnace comparison covers air-source economics in more detail.
Practical considerations
- Find an experienced installer. Loop design is critical; an undersized loop can freeze up or underperform for decades.
- Plan around landscaping. Horizontal trenching disturbs a large area; vertical drilling needs rig access.
- New builds are ideal. Installing a loop during construction, when excavation is already happening, can lower costs.
- Check incentives. Programs change often; search current offers by address with our rebate finder and look at financing options.
Frequently asked questions
How long do geothermal systems last?
The buried loop typically lasts 50 years or more, and the indoor heat pump unit commonly lasts around 20–25 years. When the heat pump wears out, you replace only the unit, not the loop.
Does geothermal work in northern Canada?
Yes, ground-source heat pumps work in very cold climates because they draw from the ground rather than the air. Loop design must account for colder ground temperatures and higher heating loads, which can increase costs.
Is geothermal heating the same as geothermal power?
No. Ground-source heat pumps use shallow, mild ground temperatures to heat homes, while geothermal power plants tap much hotter rock deep underground to generate electricity. Our post on deep geothermal power in Canada covers the latter.
The bottom line
Ground-source heat pumps are among the most efficient heating and cooling systems available, but their high up-front cost means payback depends heavily on your site and the fuel you're replacing. They make the strongest case for large or rural homes leaving oil, propane or electric heat, and for new builds. Compare quotes against a cold-climate air-source option before deciding.
Sundamentals is an independent, non-profit education platform. Program details and prices change often — check current programs for your address in our rebate finder.