Of all the heating configurations we install in Manitoba, the dual-fuel heat pump system is the one I find myself recommending most often for homes with existing natural gas service. It solves the core problem with heat-pump-only systems in our climate — the performance gap at deep cold — while still capturing the significant efficiency advantage of heat pump operation during the majority of the heating season.
What Components Make Up a Dual-Fuel System
A dual-fuel system consists of four main components working together:
- Cold-climate heat pump (outdoor unit): The air-source heat pump condenser, typically a cold-climate model rated to operate below -20°C. This is the primary heating and cooling unit during mild-to-moderate conditions.
- Air handler or furnace with compatible coil: The indoor component that distributes conditioned air through ductwork. In a dual-fuel setup, this is the existing gas furnace with an added evaporator coil for the heat pump's cooling/heating function.
- Dual-fuel control module (or compatible thermostat): The brain of the system. This controller monitors outdoor temperature and switches between heat pump operation and furnace operation based on the balance point setting. Modern smart thermostats handle this automatically.
- Existing gas furnace: Remains in place and provides backup heat when the heat pump is less efficient or insufficient. The furnace activates automatically when outdoor temperature drops below the balance point.
The Balance Point: The Key to How Dual-Fuel Works
The balance point is the outdoor temperature at which the system switches from heat pump to gas furnace. Setting it correctly is the most important aspect of dual-fuel system commissioning.
The balance point is set at the temperature where the cost to heat with electricity (via heat pump) equals the cost to heat with gas (via furnace). Below that temperature, gas is cheaper. Above it, the heat pump is cheaper.
In Manitoba, with current Manitoba Hydro electricity rates and natural gas prices, the economic balance point for most homes falls between -10°C and -18°C. The exact point depends on:
- Your specific electricity rate (Manitoba Hydro residential rates)
- Your natural gas or propane rate
- The specific heat pump's efficiency curve at different temperatures (its COP at each outdoor temperature)
We calculate this precisely for each installation. Getting the balance point right means the system is always running on the most cost-effective fuel source for current conditions.
How the System Operates Through a Manitoba Winter
Fall (October–Early December, typically 0°C to -15°C)
The heat pump runs as primary heat through most of fall. At these temperatures, a cold-climate heat pump operates with a COP of 2.0–3.5 — delivering 2 to 3.5 times more heat per unit of electricity than simple electric resistance heating. Operating costs are significantly lower than gas for this portion of the season.
Mid-Winter (December–February, frequently below -15°C)
As temperatures drop below the balance point, the control system transitions to the gas furnace. The heat pump outdoor unit may shut down entirely or run in limited capacity to assist the furnace, depending on system design. The furnace handles the coldest days reliably at full rated capacity — no performance degradation at -30°C like a heat pump would experience.
Spring (March–April, returning to 0°C to -15°C)
The heat pump resumes as primary heat as temperatures rise above the balance point. Another efficient period before the system transitions to cooling mode for summer.
Summer
The heat pump operates in cooling mode, functioning as a central air conditioner. The gas furnace sits dormant. This is one of the financial benefits of a dual-fuel system — it eliminates the need for a separate central AC unit.
What This Means for Operating Costs
A dual-fuel system typically operates in heat pump mode for roughly 60–70% of the heating season in Manitoba (the fall and spring periods plus moderate winter days). The gas furnace handles the remaining 30–40% (the coldest stretches). This split, combined with eliminating a separate cooling system, typically results in lower annual HVAC operating costs compared to a gas furnace + central AC combination — while also reducing carbon emissions from the heating system.
Natural Resources Canada's guidance on heat pump systems provides context on efficiency standards and performance expectations for Canadian climates. The Manitoba Hydro Power Smart program may have current rebates that reduce the cost of qualifying dual-fuel installations.
For a broader comparison of heat pump vs. furnace-only options, see our post on Heat Pump vs. Furnace in Manitoba: Which Makes Sense for Your Home? and for cost details, see our heat pump cost guide for Manitoba.
Our heat pump installation and service covers dual-fuel systems throughout the Interlake.
Does My Existing Furnace Work for Dual-Fuel?
Most modern gas furnaces are compatible with dual-fuel integration. Key requirements: the furnace must have an evaporator coil installed or a coil cabinet that can accommodate one, and the control board must support two-stage or multi-stage control signals from a dual-fuel thermostat. We assess compatibility during the initial consultation at no charge.
Interested in a Dual-Fuel System for Your Manitoba Home?
We assess your existing system, calculate your balance point, and provide a complete installed quote. Serving Stonewall, Winnipeg, and the Interlake.
Book a Dual-Fuel ConsultationFrequently Asked Questions
What is a dual-fuel heat pump system?
A dual-fuel system pairs a cold-climate air-source heat pump with a gas furnace backup. The heat pump handles heating and cooling efficiently during mild and moderate temperatures. When outdoor temperature drops below a set balance point — where electricity heating becomes more expensive than gas — the system automatically switches to the gas furnace. The two systems work together seamlessly; the homeowner typically doesn't notice the switchover.
What temperature does a dual-fuel system switch to gas?
The switchover temperature, called the balance point, is set during installation based on your local electricity and gas rates and the heat pump's specific efficiency curve. For most Manitoba homes at current energy prices, the balance point falls between -10°C and -18°C. Below this temperature, the gas furnace is more cost-effective. Above it, the heat pump is cheaper. We calculate this precisely for each installation.
Can I add a heat pump to my existing gas furnace?
In most cases, yes. The existing furnace stays in place and a cold-climate heat pump is added as the primary system, with the furnace serving as backup. An evaporator coil is installed in the furnace plenum for the heat pump's cooling and mild-weather heating function. A dual-fuel controller or compatible thermostat coordinates the two systems. Compatibility depends on furnace age, control board, and available space for the coil.
Is a dual-fuel system more efficient than a gas furnace alone?
On average across a Manitoba heating season, yes. A heat pump operating in mild temperatures delivers 2–3.5 times more heat per unit of energy than a gas furnace. During the 60–70% of the heating season where a dual-fuel system runs in heat pump mode, operating costs are lower than gas. The gas furnace handles the coldest 30–40% efficiently. Combined, total seasonal heating costs typically decrease compared to gas-only — while also eliminating the cost of running a separate central AC in summer.