Geothermal Heat Pump Cost in Ontario: Is Ground-Source Heating Worth It?

A geothermal heat pump in Ontario typically costs roughly $30,000–$60,000 or more installed, depending on home size, loop type and site conditions. It is usually the most efficient heating and cooling system you can buy, but the high upfront cost means it pays off best in homes that currently heat with oil, propane or electric resistance, or in new builds and major renovations where the ground work is easier.

This guide explains how ground-source systems work, what drives the cost, how operating costs compare with gas and air-source heat pumps, and what to ask before you commit.

How does a geothermal heat pump work?

A few metres below the surface, the ground in southern Ontario stays at a fairly steady temperature year-round, roughly 8–10 °C, and somewhat cooler farther north. A geothermal (ground-source) heat pump circulates fluid through buried pipes called a ground loop. In winter the fluid absorbs heat from the ground and the heat pump concentrates it to warm the house; in summer the process reverses to provide cooling.

Because the ground is much warmer than winter air, a ground-source heat pump does not lose capacity on cold nights the way an air-source unit does, and it does not need to defrost. That is the main advantage.

What types of ground loop are used in Ontario?

Loop type	How it works	Typical fit	Cost and trade-offs
Horizontal closed loop	Pipes laid in trenches about 1.5–2 m deep	Rural or large lots with open land	Lower drilling cost, but needs a lot of space and excavation
Vertical closed loop	Pipes in boreholes, often 45–150 m (150–500 ft) deep	Urban and suburban lots	Higher cost; needs a qualified driller
Pond or lake loop	Coils sunk in a body of water	Properties with a suitable pond or lake	Can be economical; environmental approvals may apply
Open loop	Uses well water directly, then returns it	Properties with good, plentiful well water	Efficient but sensitive to water quality and quantity; rules on discharge apply

Design and installation should follow the CSA C448 standard for earth energy systems, and Ontario has environmental rules covering vertical closed-loop systems and wells. A reputable installer and driller will handle the approvals; ask how they meet these requirements.

Caution: A poorly designed or undersized ground loop is very expensive to fix after landscaping is finished. Choose an installer with ground-source experience who provides the loop design calculation in writing.

How much does a geothermal heat pump cost in Ontario?

The heat pump unit itself is only part of the price. The loop, drilling or excavation, and restoration of the yard usually make up the largest share.

Component	Rough share or range (estimate)
Ground loop (drilling or trenching, pipe, grouting)	Often 40–60% of the total
Heat pump unit and indoor installation	Varies by capacity and features
Ductwork changes or hydronic integration	Depends on the existing system
Electrical work, permits, landscaping repair	Varies
Typical total for an existing home	Roughly $30,000–$60,000+

For comparison, a ducted cold-climate air-source heat pump typically costs roughly $12,000–$25,000 installed, and a high-efficiency gas furnace $5,000–$9,000.

How do operating costs compare?

The example below assumes a detached home that would use about 2,400 m³ of natural gas a year for space heating in a 95% furnace. That works out to roughly 23,600 kWh of heat delivered. Electricity is priced at an example all-in 14¢/kWh after the Ontario Electricity Rebate, and gas at 45¢/m³ variable cost. These are illustrations, not predictions for your home.

System	Seasonal efficiency (assumed)	Energy used	Approx. annual heating cost
Gas furnace	95%	2,400 m³	~$1,080 (plus the gas fixed monthly charge)
Electric baseboards	COP 1.0	~23,600 kWh	~$3,300
Cold-climate air-source heat pump	Seasonal COP ~2.7	~8,700 kWh	~$1,220
Geothermal heat pump	Seasonal COP ~3.5	~6,700 kWh	~$940

Since the federal carbon charge on natural gas was removed on 1 April 2025, the operating-cost gap between gas and heat pumps has narrowed. For a gas-heated home, geothermal's annual savings on heating alone may be only a few hundred dollars, which does not pay back a $30,000+ premium quickly. If you disconnect gas entirely, you also avoid the fixed monthly gas charge, which improves the picture somewhat.

The case is much stronger for homes heated with electric baseboards, oil or propane, where annual savings can run into the thousands. Try our heat pump vs furnace calculator with your own usage and prices, and read our heat pump vs gas furnace cost comparison for more context.

Rebates for geothermal in Ontario

According to Save on Energy, the Home Renovation Savings Program has offered rebates for owned ground-source heat pumps:

• Gas-heated homes: $3,000 flat.
• Homes with other primary heat (electric, oil, propane and so on): $2,000 per ton, up to $12,000.

The equipment must be on the qualified products list, installed by a participating contractor, and pre-approved before work starts. A heat pump that receives another Enbridge, IESO or Government of Ontario incentive is not eligible, and total funding cannot exceed 100% of the cost. Program details change, so confirm everything on saveonenergy.ca. Our Home Renovation Savings Program guide explains the process, and our financing guide covers ways to spread the cost.

When does geothermal make sense?

Geothermal tends to be a good fit when several of these are true:

1. You currently heat with oil, propane or electric resistance.
2. You have space for a horizontal loop, or a site suited to vertical drilling.
3. You are building new or doing a major renovation, so ductwork and landscaping are already being disturbed.
4. You plan to stay in the home for many years. Ground loops are commonly expected to last 50 years or more; the indoor heat pump unit typically lasts 20–25 years.
5. You live in a colder region such as Ottawa, Sudbury or Thunder Bay, where air-source units lean more on backup heat.
6. You value quiet operation, since there is no outdoor fan unit.

For many gas-heated homes in southern Ontario, a cold-climate air-source heat pump, possibly in a hybrid setup with the existing furnace, delivers most of the benefit at a fraction of the cost. See our heat pump guide.

Frequently asked questions

Can a geothermal system heat my water too?

Many units can include a desuperheater, which uses waste heat to preheat domestic hot water, especially in summer when the system is cooling. Some systems can also be configured to supply hydronic floors.

Does geothermal need backup heat?

A properly sized system usually covers the full heating load, but many include small electric backup for very cold periods or service outages. If the loop is undersized, backup will run more and costs rise.

Is geothermal the same as geothermal power plants?

No. Residential geothermal in Ontario uses the stable shallow ground temperature with a heat pump. It does not tap volcanic or deep geothermal heat.

How long does installation take?

Drilling or trenching usually takes a few days, and indoor work a few more. Expect disruption to the yard, and plan landscaping repair into your budget and schedule.