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What Is a Dual-Fuel Heating System?
A dual-fuel heating system, also known as a hybrid heating system, traditionally combines an electric heat pump with a natural gas or propane furnace. (While heat pumps can also complement existing oil furnaces, hydronic boilers, or electric baseboard systems, standard residential dual-fuel setups share central ductwork with a furnace.) A compatible dual-fuel thermostat or control system automatically selects the most appropriate heating source based on the programmed balance point, system settings, and operating conditions.
In mild weather, the heat pump provides most or all of the home’s heating and cooling. When outdoor conditions reach the programmed balance point, the system automatically transitions to the natural gas or propane furnace to maintain reliable heating when operating conditions require it. The changeover happens automatically, so homeowners don’t need to adjust any settings.
How Does a Dual-Fuel System Work?
A dual-fuel heating system automatically operates in three different modes throughout the year based on outdoor conditions and the programmed control settings.
1. Heat pump mode (above the balance point)
When outdoor conditions remain above the system’s programmed balance point, the heat pump operates as the primary heating source. It extracts heat from the outdoor air and transfers it indoors using electricity. Because it moves heat rather than generates it, a heat pump can deliver several times more heat energy than the electricity it consumes under many operating conditions. This efficiency is commonly expressed as the Coefficient of Performance (COP), which compares the amount of heat delivered to the amount of electrical energy consumed. During shoulder seasons and milder winter conditions, a properly sized cold-climate heat pump can typically meet the home’s heating demand without requiring assistance from the natural gas furnace.
2. Furnace mode (below the balance point)
When outdoor conditions reach the programmed balance point, the dual-fuel control system automatically transitions from the heat pump to the natural gas furnace based on the system’s operating settings and heating requirements. Once the furnace takes over, it provides dependable heating during prolonged periods of cold weather, helping maintain consistent indoor comfort. The transition occurs automatically, so homeowners do not need to manually switch between heating sources.
3. Cooling mode (summer)
During the cooling season, the heat pump’s reversing valve changes the direction of the refrigeration cycle, allowing the system to operate like a central air conditioner. It removes heat from inside the home and releases it outdoors, providing efficient cooling. During this time, the furnace remains idle. As a result, a dual-fuel system provides year-round heating and cooling using a single outdoor heat pump, eliminating the need for a separate central air conditioner in most residential installations.
Key Components of a Dual-Fuel System
A typical residential dual-fuel installation includes:
| Component | Purpose in the system |
|---|---|
| Cold-climate heat pump | Primary heating and cooling source; operates on electricity; provides heating during most of the year |
| Gas or propane furnace | Secondary heat source; activates automatically when outdoor temperatures drop below the balance point |
| Dual-fuel capable thermostat | Automatically controls when the heat pump and furnace operate based on the programmed balance point and system settings. |
| Air handler / ductwork | Distributes conditioned air throughout the home; shared by both systems |
| Auxiliary controls | Sensors and control boards that coordinate fuel switching without homeowner input |
The thermostat or control system coordinates when the heat pump and furnace operate using inputs such as outdoor temperature and the programmed balance point. The installer configures the balance point during system setup based on the home’s heating load, heat pump performance, local utility rates, and the desired operating strategy. This helps determine when the system transitions from the heat pump to the natural gas furnace to balance comfort and operating efficiency.
What Is the Balance Point and Why Does It Matter?
The balance point is the programmed operating point at which a dual-fuel system transitions from the heat pump to the natural gas furnace. It is determined by factors such as your home’s heating requirements, the heat pump’s performance, utility rates, and the desired operating strategy. Because these factors vary, the balance point is different for every home.
As a general reference for Ontario homeowners:
- There is no universal balance point for every home. Although many Ontario dual-fuel systems are configured within a similar temperature range, the optimal setting should be determined during system design based on your home’s heating requirements, equipment performance, and operating costs.
- If your electricity rate is low relative to gas, the balance point can be set lower, meaning the heat pump runs longer before the furnace kicks in
- If gas is notably cheaper in your area, the balance point can be raised, using the furnace more frequently
- A licensed HVAC technician programs the balance point during installation and can adjust it as utility rates change
Getting the balance point right is one of the most important parts of a dual-fuel installation because it helps balance comfort and operating costs. If it is set too high, the system may switch to the natural gas furnace earlier than required, reducing the opportunity to take advantage of the heat pump’s efficiency. If it is set too low, the heat pump may continue operating when the furnace would be the more economical heating source, depending on utility rates and system performance. LG Home Comfort technicians set and verify the balance point as part of every dual fuel HVAC installation in Ontario.
Dual-Fuel vs. Heat Pump Only vs. Furnace Only: How They Compare
| Factor | Dual-Fuel (Heat Pump + Furnace) | Heat Pump Only | Furnace Only |
|---|---|---|---|
| Primary heating source | Heat pump above the programmed balance point; furnace below the programmed balance point | Heat pump as the primary heating source (backup heating may be required depending on system design) | Natural gas or propane furnace year-round |
| Efficiency (mild weather) | Typically more energy-efficient than combustion heating during mild outdoor temperatures (performance varies by model and conditions) | Typically more energy-efficient than combustion heating during mild outdoor temperatures (performance varies by model and conditions) | High-efficiency natural gas furnaces typically achieve 92–98% AFUE |
| Performance in extreme cold | Automatically transitions to the furnace when the programmed balance point is reached to maintain reliable heating | Depends on system capacity and outdoor temperature; cold-climate models continue operating at low temperatures but heating capacity gradually declines | Consistent heating performance regardless of outdoor temperature |
| Upfront cost | Generally highest | Moderate to high | Generally lowest |
| Operating cost | May reduce annual heating costs depending on utility rates, system settings, and operating conditions | Can offer the lowest operating costs where electricity rates are favourable and the home is well suited to a heat pump | Depends on natural gas or propane prices |
| Cooling included | Yes | Yes | No (requires a separate air conditioner) |
| Best suited for | Homes seeking a balance of efficiency, comfort, and dependable winter heating. | Well-insulated homes with properly sized cold-climate heat pumps | Homes prioritizing lower upfront costs or replacing an existing furnace |
For many Ontario homes, a dual-fuel system offers a practical balance of efficiency, comfort, and dependable winter heating. Homes with excellent insulation in milder parts of Southern Ontario may find that a properly sized cold-climate heat pump alone provides sufficient heating. Homes in colder parts of Northern Ontario, or in areas where natural gas costs are relatively low, may operate the furnace more frequently during winter. For a more detailed comparison, see our guide on heat pump vs. furnace for Ontario homes.
When a Dual-Fuel System May Be Worth Considering
Whether a dual-fuel system is the right choice depends on several factors. The table below outlines the situations where it may be worth considering.
| Your Situation | A Dual-Fuel System May Be Worth Considering If… |
|---|---|
| Climate | You live in an area with cold winters and milder shoulder seasons, allowing the heat pump to operate efficiently for much of the year while the furnace provides supplemental heating during colder periods. |
| Existing equipment | Your existing furnace is compatible and in good condition, allowing you to replace an aging air conditioner with a heat pump while retaining the furnace. |
| Energy costs | Your home relies on natural gas, propane, heating oil, or electric heat, and local utility rates make switching between electricity and your secondary heat source a practical operating strategy. |
| Comfort priorities | You want dependable heating during colder weather while taking advantage of the heat pump’s efficiency whenever conditions allow. |
| Environmental goals | You want to reduce natural gas consumption without relying entirely on an all-electric heating system. |
| Budget | You’re comfortable with a higher upfront investment in exchange for potential long-term operating cost savings, depending on utility rates and system performance. |
No single factor determines whether a dual-fuel system is the best choice. A qualified HVAC contractor should perform a professional load calculation (such as CSA F280), evaluate your existing equipment, and recommend the most appropriate system based on your home’s heating requirements, existing equipment, and operating costs.
When a Dual-Fuel System May Be Less Suitable
A dual-fuel system may be less suitable depending on your home’s existing HVAC system, renovation plans, energy costs, and overall heating requirements. For example:
- Your home has no existing ductwork, and installing new ducts would add significant cost to the project unless they are already planned as part of a renovation or new build.
- Local electricity and natural gas prices, combined with your home’s heating demand and the heat pump’s performance, make another heating solution more economical.
- Your existing furnace is relatively new and in good condition, making it practical to continue using it unless there is a compelling reason to replace or integrate it with a heat pump.
- Your goal is to eliminate natural gas entirely, in which case a properly sized cold-climate heat pump with an appropriate backup heating strategy may be worth considering, depending on your home’s heating requirements.
If you’re unsure which system is right for your home, a professional HVAC assessment is the most reliable way to compare your options. A qualified contractor should evaluate your home’s heat loss, insulation levels, existing HVAC equipment, local utility rates, and perform a CSA F280 heat load calculation before recommending a heating system.
In colder regions such as Ottawa, some homeowners may benefit from a dual-fuel system depending on their home’s heating requirements, equipment selection, local energy costs, and overall system design. A professional assessment can determine whether a dual-fuel or heat pump-only system is the better fit for your home.
What Does a Dual-Fuel System Cost in Ontario?
The cost of a dual-fuel system in Ontario varies depending on home size, equipment selection, electrical upgrades, ductwork modifications, and installation complexity. Typical installed price ranges include:
- Heat pump added to an existing compatible furnace: $5,000–$12,000, depending on the equipment capacity, model, and installation requirements.
- Complete dual-fuel system (new heat pump and new furnace): $10,000–$20,000+, depending on the equipment selected and installation complexity.
- Operating costs: Actual operating costs depend on factors such as the programmed balance point, local electricity and natural gas prices, home insulation, equipment efficiency, and outdoor temperatures. A dual-fuel system typically relies on the heat pump during milder weather and automatically switches to the furnace when operating conditions favour the furnace.
- Available rebates: Eligible cold-climate heat pump installations may qualify for available provincial, utility, or other incentive programs. Since eligibility requirements and funding amounts can change, ask your LG Home Comfort Advisor about the currently available rebate programs and qualification criteria during your consultation.
Because rebate programs change over time, we recommend confirming current eligibility before purchasing equipment. During your in-home consultation, your LG Home Comfort Advisor will explain which incentive programs may apply, outline the eligibility requirements, and provide a rebate eligibility assessment based on your home’s specific circumstances. Benefits of a Dual-Fuel System for Ontario Homeowners
- Potentially lower operating costs: During milder weather, the heat pump may handle much of the home’s heating demand by transferring heat rather than generating it. Depending on the programmed balance point, local utility rates, home insulation, and system performance, a dual-fuel system may help reduce annual heating costs compared with relying solely on a natural gas furnace.
- Year-round comfort: The heat pump provides heating and cooling during much of the year, while the natural gas furnace automatically provides supplemental heating when outdoor conditions reach the programmed balance point.
- May reduce natural gas consumption: Because the heat pump can reduce natural gas consumption during milder weather, a properly designed dual-fuel system may help lower greenhouse gas emissions compared with heating exclusively with a natural gas furnace.
- Potential eligibility for rebates and incentives: Eligible heat pump installations may qualify for available provincial, utility, or other incentive programs. Eligibility requirements, available funding, and qualifying equipment vary by program and should be confirmed before purchasing equipment.
- Dependable heating during colder weather: A dual-fuel system automatically transitions from the heat pump to the natural gas furnace when outdoor conditions reach the programmed balance point, helping maintain reliable indoor comfort based on the system configuration and operating conditions.
- A practical path toward electrification: For homeowners looking to gradually reduce natural gas use, a dual-fuel system can decrease gas consumption during much of the heating season while continuing to rely on a natural gas furnace during prolonged periods of cold weather.
How LG Home Comfort Sets Up Dual-Fuel Systems in Ontario
A proper dual-fuel installation involves more than simply installing a heat pump and furnace. LG Home Comfort technicians:
- Assess the home’s heat loss and existing ductwork capacity
- Select heat pump and furnace models sized correctly for the home
- Program the balance point based on the home’s heating requirements, local utility rates, and the selected equipment
- Commission both systems together to confirm the automatic switching works correctly
- Walk homeowners through thermostat settings and what to expect from the system
If you have a working furnace and are adding a heat pump for the first time, our technicians confirm compatibility before any equipment is ordered. Kitchener homeowners can book a dual-fuel heating assessment with same-week availability.
