Heat Pump vs. Furnace: 6 Things to Consider

When it comes to keeping your home warm and comfortable through an Ontario winter, two systems usually lead the conversation: heat pumps and furnaces. In fact, the term heat pump vs furnace gets thousands of searches every month, making it clear that Ontario homeowners want clarity, especially with the rise of rebates and new high-efficiency home heating technologies. 

If you’re asking yourself whether a heat pump or AC and furnace setup is right for your home, you’re not alone. Many London and southwestern Ontario homeowners are exploring energy-efficient alternatives, looking to reduce monthly bills, and wondering whether a heat pump can replace a furnace entirely.

Our London heating contractors put together this guide to break down everything you need to know, including cost, efficiency, maintenance, safety, and whether heat pumps make sense in Ontario’s colder climate.

What’s the Difference Between a Heat Pump and a Furnace?

Both systems heat your home, but they work very differently.

How Does a Furnace Work?

A furnace creates heat by burning fuel (natural gas, propane, or oil). It then uses a fan to push that heat through your ductwork and circulate it throughout your home. 

How Does a Heat Pump Work?

A heat pump moves heat rather than generating it. Even in cold weather, heat energy exists outdoors. A heat pump extracts that heat and transfers it inside. In summer, it reverses to work like an air conditioner.

Do I Have a Furnace or Heat Pump?

A furnace typically looks like a metal cabinet that’s installed either vertically or horizontally. All components of a furnace are stored indoors. If you have a heat pump, however, the main unit, which looks sort of like an air conditioner, is outdoors, while the air handler is indoors. 

Another way to tell whether you have a furnace or a heat pump is to turn your heat on and then go outside. If your exterior unit is on and blowing air, you have a heat pump. 

Can a Heat Pump Replace a Furnace?

Yes, in many Ontario homes, a heat pump can fully replace a furnace. Modern cold-climate models operate efficiently in winter, especially when sized correctly.

However, some homeowners still prefer a hybrid system where the furnace acts as backup during extreme cold.

6 Factors to Consider in Choosing a Furnace vs. Heat Pump

1. Climate

In Canada, climate is a huge consideration when weighing a heat pump vs. furnace. Let’s look at both options:

Heat Pumps

Thanks to cold-climate air-source heat pump technology, modern units work well in temperatures as low as –30°C. This makes them much more suitable for Ontario than they were even a decade ago. 

Furnaces

Furnaces shine in extreme cold and are often preferred by homeowners who prioritize maximum heat output or already have a gas line installed. A furnace can be the best option for homes in rural areas with limited electrical capacity. 

Bottom line: Both systems work in Ontario, but heat pumps are now a viable option even in colder regions.

2. Energy Efficiency and Operating Costs

Is a heat pump or gas furnace more efficient? According to the Canadian Climate Institute, heat pumps are two to five times more efficient than even the most modern, high-efficiency gas furnaces. 

Heat Pumps

• Transfer 3–5x more energy than they consume
  
• Lower monthly energy use
  
• Provide heating and cooling with one unit
  
• Reduce your carbon footprint
  
• May qualify for thousands of dollars in Ontario heat pump rebates

High-Efficiency Gas Furnaces

• Up to 98% AFUE (meaning 98% of fuel becomes heat)
  
• Natural gas is typically cheaper than electricity
  
• More stable performance in sub-zero temperatures
  

So, which is cheaper, a heat pump or furnace?

The cost of a heat pump vs. furnace varies depending on regional energy prices and climates. The Canadian Climate Institute assessed the lifetime costs of different heating and cooling combinations in a variety of types and ages of houses across five Canadian cities. 

The analysis concluded that heat pumps were the lowest-cost heating and cooling solution for the majority of house types in most cities, including Toronto. Heat pumps had a lower lifetime cost compared to a gas-fired furnace. 

The exception was Edmonton, where, due to low gas prices and cold climate, a heat pump with a gas backup or a gas furnace and air conditioner combination were both more cost-effective than a heat pump alone. 

Bottom line: In Ontario, a heat pump has a lower lifetime cost than a gas furnace due to its energy efficiency. 

3. Upfront Costs and Rebates

Furnace

• Lower upfront equipment cost
  
• Installation typically straightforward
  
• No major electrical upgrades required
  
• A separate AC unit is needed for cooling
  

Heat Pump

• Higher upfront cost
  
• Often replaces both furnace and AC
  
• Significant rebates available
  

Ontario’s heat pump rebate can reduce the cost by $2,000–$12,000, depending on your system and fuel type. This dramatically improves the value of upgrading.

You can find the full rebate breakdown here: Are Heat Pumps Worth it in Ontario? A Guide to the Benefits, Rebates, and Incentives 

Heating Performance and Comfort

Furnaces produce hot, powerful bursts of heat. Heat pumps produce gentler, more consistent heating.

Choose a Furnace If You Want:

• Strong, fast heating
  
• Maximum heat output in sub-zero temperatures
  
• Familiar operation
  

Choose a Heat Pump If You Want:

• More consistent temperature
  
• Better humidity control
  
• Whisper-quiet performance
  
• One system for both heating and cooling
  

4. Safety Considerations

Furnaces

• Burning fuel means a risk of carbon monoxide poisoning
  
• Requires proper ventilation
  
• Regular inspections are a must
  

Heat Pumps

• No combustion
  
• No carbon monoxide risk
  
• No gas leaks
  
• Safer for tight indoor spaces
  

If safety is a priority, heat pumps have a clear advantage.

5. Space Requirements

Furnace

• Installed indoors
  
• Requires 30″ of clearance
  
• Needs venting
  

Heat Pump

• Outdoor unit needs ~24″ clearance
  
• Indoor air handler included
  
• Eliminates the need for a separate AC
  

Small homes or older homes with limited mechanical space often benefit from heat pump systems.

6. Maintenance and Lifespan

Both systems benefit from annual professional maintenance.

Furnace Maintenance Includes:

• Burner inspection
  
• Heat exchanger checks
  
• Venting inspection
  
• Filter changes
  

Heat Pump Maintenance Includes:

• Outdoor coil cleaning
  
• Refrigerant checks
  
• Filter changes
  
• Defrost cycle inspection
  

Both heat pumps and furnaces can last 15–20+ years with proper care.

Final Verdict: Heat Pump vs Furnace—Which Should You Choose?

There is no one-size-fits-all answer, but here’s a simple breakdown:

Choose a Heat Pump if:

• You want lower utility bills
• You want heating and cooling in one system
• You want to reduce carbon emissions
• You qualify for rebates
• You want quieter, cleaner operation

Choose a Furnace if:

• You rely on powerful heat during extreme cold
• Natural gas is affordable in your area
• Your current furnace is still in good shape
• You’re not ready for a full-system upgrade

If you’re still unsure, don’t worry. Comfort Zone Services can help you compare systems for your home, budget, and lifestyle.

Ready to Upgrade? We Can Help.

Comfort Zone Services installs, repairs, and maintains all furnace and heat pump brands and models in the London, Ontario area. Our technicians will walk you through:

• Whether a heat pump or furnace is right for your home
• Total cost of ownership
• Potential energy savings
• Your eligibility for Ontario’s heat pump rebates
• Installation timelines and system recommendations

Call us at 226-210-6293 to book your free in-home estimate today!