Discover the Benefits of a Dual Fuel Heating System: Efficiency, Comfort, and Savings When it comes to home heating solutions, we often don’t realize how much energy we’re using—or how...
Dual Fuel Heating System: How Heat Pumps and Furnaces Work Together for Maximum Efficiency
By Mike Holmes
Mike’s Advice / Home Renovation
Wednesday, January 29th, 2025 @ 5:11pm
Discover the Benefits of a Dual Fuel Heating System: Efficiency, Comfort, and Savings
When it comes to home heating solutions, we often don’t realize how much energy we’re using—or how much of a toll that takes on our environment. In Canada, heating accounts for nearly 10% of our carbon emissions. Dual fuel heating systems, which combine heat pumps and furnaces, are gaining attention as a more energy-efficient solution. Many people believe heat pumps are a better option than traditional HVAC systems, such as furnaces. This belief is part of a global effort to reduce emissions. Electricity powers heat pumps, so users can include them in a net-zero energy-efficient home heating system.
What is a Dual Fuel System?
A recent study by CanmetENERGY–Ottawa identifies a dual fuel or hybrid heating system as one way to save energy, reduce greenhouse gas (GHG) emissions and build Canada’s resilience to a changing climate and changing energy prices.
A dual fuel heating system is the combination of a heat pump and a furnace, working together to keep your home comfortable year-round. The idea is simple: use the energy-efficient heat pump when the outdoor temperature is moderate, and then rely on the furnace when the weather gets too cold.
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In a dual fuel system, the heat pump and furnace work together to keep your home warm throughout the year. Here’s how it works:
- Heat Pump: The heat pump efficiently heats your home when outdoor temperatures are moderate. It moves heat from the outside air into your home instead of generating heat, which makes it significantly more energy-efficient than traditional heating systems. Heat pumps use electricity, which means they can fit into a net-zero energy system, helping reduce your carbon footprint.
- Furnace: When temperatures drop to levels where a heat pump is less effective (below -5°C or 23°F), the furnace steps in to provide consistent warmth. Powered by natural gas, oil, or propane, furnaces are great for extreme cold because they can produce heat even when it’s freezing outside.
If you’re considering an energy-efficient heating solution, dual fuel heating systems combining a heat pump and furnace might be the perfect choice for your home. They offer energy savings, cost-effective heating, and work in a wide range of temperatures, especially cold climates like those in Canada.
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How Do Heat Pumps Work In The Winter?
Heat pumps are incredibly efficient in moderate temperatures (-1 to 4 C or 30 to 40 F), using electricity to move heat from the outside air and transfer it indoors, rather than generating it.
Because of their technology, heat pumps can keep your home warm and comfortable for much less than a furnace, saving money and energy.
Traditional heat pumps are an excellent option for southern or coastal climates where winters are less severe. However, there are new models of heat pumps designed to handle the cold Canadian winters, like the new Bosch IDS Ultra Cold Climate Heat Pumps.
I’m talking as low as minus 25 degrees Celsius or minus 13 degrees Fahrenheit. That’s cold! We’ve installed a few of these cold climate heat pump units on our shows.
The Bosch IDS Ultra Cold Climate Heat Pump model comes in a variety of sizes so you and your HVAC specialist can choose the best one for your needs. Ideal for climates with harsh winters, northern or mountainous climates.
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Why Furnaces Are Best for Freezing Temperatures
Typically, when outdoor temperatures fall below the threshold of a heat pump (-7 to-5 C or 25 to 30 F), the furnace would take over to provide sufficient heating. Furnaces fueled by gas oil or propane are more effective in freezing temperatures.
A furnace offers constant warmth, while heat pumps can struggle in extreme cold conditions because extracting heat from freezing air is inefficient.
A furnace offers constant warmth, it has been around for ages.
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Smart Dual Fuel Heating System: Perfect for Year-Round Efficiency
A smart dual fuel heating system starts with a smart thermostat or control panel. These devices manage the heating system by switching between the heat pump and the furnace. The smart thermostat automatically sends a signal to switch between the furnace and the heat pump to maximize energy efficiency.
The idea is simple:
- The heat pump works when outdoor temperatures are moderate or during off-peak times (when electricity costs less).
- The furnace kicks in during extreme cold or during peak electricity times to ensure you’re not spending extra on energy.
This setup ensures maximum efficiency while maintaining comfort. It’s perfect for areas with fluctuating winter temperatures or continental climates, where the weather can change dramatically from day to day.
Tips for Dual Fuel Heating System Optimal Performance:
To make sure your dual fuel heating system performs at its best, here are a few things you need to consider before you get a new system installed:
- Proper Insulation: To minimize heat loss, you need to ensure your home is well-insulated. I suggest getting an energy audit, blower door test and insulation inspection and follow the recommendations.
- Regular Maintenance: Keep both the heat pump and furnace clean and serviced to maintain efficiency. Discuss a regular maintenance service plan with your HVAC specialist.
- Zoning Systems: Use zoning systems to direct heat where needed, improving comfort and efficiency.
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Why an Electric Heat Pump Is a Smart Choice
In my opinion, using electric air source heat pump systems is a no-brainer for anyone looking to lower their carbon footprint and save money.
These systems can reduce your reliance on natural gas heating, and where we live in Ontario, the operating costs are pretty similar to those of a natural gas furnace. In fact, you can expect modest savings on utility bills when using a dual fuel heating system during moderate outdoor temperatures and off-peak electricity hours.
If you’re thinking about replacing an aging air conditioner, consider switching to an electric air source heat pump. They are both a heating and cooling system. So it will keep you cool in the summer, and also heat your home efficiently during the winter.
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Why I Choose Bosch Heat Pumps
When it comes to heat pumps, I trust Bosch. We’ve installed the Bosch Inverter Ducted Split System Heat Pumps on many of our projects, and it consistently delivers high performance with exceptional energy efficiency—saving homeowners money on utility bills. Plus, it’s super quiet, operating at just 59 decibels.
Here are some other reasons why I trust Bosch heat pumps:
- Fully Modulating Inverter Drive: This adjusts power based on your heating or cooling needs, ensuring energy is used effectively.
- Flexible System: Whether you have a communicating or non-communicating system, Bosch heat pumps integrate seamlessly with both.
- Utility Demand Response: The system can automatically adjust during peak times to help save on energy costs.
- Bosch EasyAir App: Control your system remotely, giving you the convenience to monitor and adjust settings from anywhere.
- 10-Year Warranty: Bosch stands behind their product, offering a solid warranty for long-term peace of mind.
If you’re considering a Bosch system, you can find a certified Bosch installer in your area by visiting BoschHomeComfort.US and clicking “Find an Installer”.
A dual fuel heating system is the perfect solution for homeowners looking for comfort, to save money, and reduce their energy consumption. This heating system continuously adjusts to changing conditions to give you the best performance. That’s especially important in areas where winter temperatures can be all over the place.
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Frequently Asked Questions (FAQs) about Dual Fuel Heating System
How much energy can I save with a dual fuel heating system?
A dual fuel heating system can save you up to 30% on your heating bills by using the most energy-efficient option available based on the temperature outside.
Can a dual fuel system work in extreme cold climates?
Yes! For colder climates, a dual fuel backup may be required. This depends on where you live and the design and efficiency of your home. Many high-efficiency heat pump systems come with an integrated electric resistance heating system that acts as a backup at colder temperatures
Bosch Dual Fuel System, with outdoor BOVA20 unit, BGH96 furnace, and BMAC Cased Coil
Newer heat pump models, like the Bosch IDS Ultra Cold Climate Heat Pumps, can operate in temperatures as low as -25°C, making them perfect for extreme cold climates.
Is a dual fuel heating system expensive to install?
While the initial cost of installing a heat pump may be higher than a traditional system, the savings on your energy usage bills over time can offset some of these costs. This makes it a smart investment in the long run.
You can also find out more about the tax credits and incentives available in your area at BoschHomeComfort.US
Can I install a dual fuel heating system in an existing home?
Yes, a dual fuel or hybrid heating system can be retrofitted into most homes, though it’s important to consult with a professional HVAC contractor to ensure compatibility.
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