Furnaces vs. Heat Pumps

As a homeowner, you might consider heat pumps vs. furnaces when planning a new home or replacing or repairing an existing system. Both unit types provide climate control options for homes, but each is more suitable for various climates and comfort needs.
This guide digs into the details of furnaces vs. heat pumps, including:
Keep reading to learn about these HVAC system options and how to make a choice for your home.
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The Differences Between Furnaces and Heat Pumps
The main difference between heat pumps and furnace systems is how they generate heat.
A furnace generates heat by burning fuel or drawing on electric power in the case of an electric furnace. The type of furnace you have depends on the fuel you use, as you can have gas or oil furnaces.
A heat pump doesn’t generate heat from fuel or by using electricity, but it does typically require electrical power to operate. Instead, heat pumps transfer heat from outside to the inside to warm a space. They can also operate in reverse, transferring heat from inside out to cool a space.
Efficiency and Operating Cost Comparison
Furnaces and heat pumps are also different in how efficiency is measured:
- Furnace efficiency: Measured in annual fuel utilization efficiency (AFUE)
- Heat pump efficiency: Measured in heating seasonal performance factor (HSPF), coefficient of performance (CoP), and, for cooling mode, seasonal energy efficiency ratio (SEER)
You can boil these down to some practical considerations. For example, the AFUE tells you how much energy a unit converts to heat versus how much is lost in waste or exhaust. A 90% AFUE means only 10% is lost. The CoP indicates the amount of heat produced for every unit of electricity used. A higher number is better here.
Operating costs depend on efficiency and the cost of the fuel required. For instance, natural gas prices tend to be lower than prices for oil and propane. So, an efficient natural gas furnace may have a lower operating cost than an equally efficient oil furnace. Electric furnaces can struggle to keep up with heating needs, resulting in high utility bills.
Performance in Different Climates
In the mild climate experienced around much of the Carolinas and surrounding areas, heat pumps offer potential cost savings as they can run efficiently year-round. They also have a dual functionality, cooling a space in the summer months.
However, in colder climates like elevated mountain areas, gas furnaces may perform better and help you save money. Heat pumps can struggle to keep a space warm enough when the ground or air outside is especially cold. In very cold areas, homeowners may want to discuss options like cold-climate heat pumps or backup heating modes.
Installation Considerations and System Compatibility
Considerations like installing a heat pump or a gas furnace should include discussions about compatibility. For example, your system may require modifications if you want to switch from a furnace to a heat pump. A professional HVAC technician can inspect your system, including the ductwork, and inform you of any necessary repairs or maintenance. Be prepared for discussions about:
- Whether existing ductwork holds up to new system requirements or whether you need upgrades
- Changes in electric capacity, wiring, circuit breakers, and even your electrical panel
- The need for new or updated refrigerant lines
As you discuss these technical considerations with your HVAC service provider, bring up your own preferences. Ask about what size unit you need to meet your comfort levels safely and efficiently, and let your service tech know how you feel about noise from units.
How to Decide Which is Better for You
Talk about the pros and cons of options with your HVAC provider. A furnace offers reliable performance in extreme cold, simpler operation, and potentially lower up-front cost, depending on your installation needs. A heat pump offers dual functionality, improved efficiency in moderate climates, and a typically lower environmental impact.
If you’re looking for heating options in a very cold area, a furnace is probably the better choice. In milder climates, heat pumps could work for year-round comfort. Running a cost-benefit analysis with a trusted HVAC provider, like Comfort Systems, can help you make an informed choice.
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