View the full presentation on “Retrofitting a Furnace Central AC to Furnace Heat Pump” here.
The shift from traditional air conditioners to air source heat pumps is more than just a passing trend — it’s a movement toward a greener, more energy-efficient future. As air conditioner sales start to decline, heat pumps are emerging as a smart, all-in-one solution to home climate control. Regulatory authorities across North America are championing the transition, aiming to reduce our carbon footprint and help homeowners achieve the ultimate goal: a net-zero home.
A net-zero home is one that generates as much energy as it consumes, using advanced technologies like air source heat pumps, better insulation, and solar panels to reduce energy bills — sometimes even to zero.
But before jumping on the heat pump bandwagon, there are several factors both homeowners and technicians need to consider when upgrading from an air conditioner or traditional heating system. Here’s a look at the key points involved in a successful transition.
Why heat pumps?
So why are heat pumps gaining traction and why should a homeowner consider making the switch?
Heat pumps are incredibly energy-efficient because they don’t generate heat — they move it. In the summer, they work like an air conditioner, removing heat from the indoor air and transferring it outside. In the winter, they reverse the process, extracting heat from the cold outside air and bringing it inside. In fact, a heat pump can provide up to three times more heat than the electrical energy it consumes, making it far more efficient than traditional heating methods.
Additionally, by reducing reliance on fossil fuels, heat pumps help homeowners lower their carbon footprint, aligning with a broader push toward sustainability and net-zero living.
While heat pumps are more energy-efficient, upgrading to one isn’t always straightforward. There are several factors that must be considered before making the change.
If your home is already equipped with an existing heating source — whether it’s electric, oil, or gas — this will play a key role in how your heat pump system is designed. You’ll need to ensure the existing setup is compatible with the heat pump. For example, does your ductwork have the capacity to handle the air volume (CFM) needed for efficient operation? Older homes may have undersized ductwork, leading to poor airflow and system inefficiency. Similarly, the furnace size and coil must be appropriate for the load required by the heat pump. These are crucial details to keep in mind, and they’re often addressed in specialized training courses like “heat loss and gain” and “ductwork sizing.”
Check the electrical
A heat pump requires a reliable power source, which means your electrical panel must be up to the task. Does it have enough space for a double-pole breaker? Does the amperage rating meet the demands of the new heat pump? It’s crucial to ensure the electrical system can handle the load; a licensed electrician should handle any upgrades to the electrical panel. Additionally, proper wiring must be used based on the distance between components, with the correct gauge to ensure safe and efficient operation.
For low-voltage wiring, you’ll need a minimum of four-conductor wire between the indoor unit and the heat pump, and a six-conductor wire minimum between the indoor unit and thermostat if you plan to operate one-stage heating and cooling. A thermostat is also essential and choosing the right one can significantly impact the system’s performance. While a standard multi-heat thermostat (two heat, four heat, etc.) will work, a smart thermostat is highly recommended for optimal energy efficiency. Some of these smart thermostats analyze factors like utility rates, outdoor temperature, and indoor humidity to determine when to run the heat pump or activate backup heating systems — saving both energy and costs.
Don’t overlook the details
The placement of the heat pump is another critical consideration. If your customer already has an air conditioner, don’t assume the location is ideal for the new heat pump. Heat pumps are more sensitive to outdoor conditions such as prevailing winds and snow accumulation. It’s required to install the unit on a stand to avoid snow build-up, ensuring effective operation in colder months.
If replacing an old AC, it’s a good idea to replace the copper lines as well, though reusing them may sometimes be the only option. In these cases, be sure to use the appropriate flush kit to avoid contamination from old refrigerant oils, which can damage the new system.
Transparency is key when it comes to discussing the heat pump installation process with your customer. Make sure they understand that switching to a heat pump doesn’t mean they’ll never use their backup heat source. Many homeowners mistakenly assume that once a heat pump is installed, they won’t need to rely on any other heating system. Be clear about how the system will work and under what circumstances the backup heat will activate, especially during extremely cold temperatures.
Taking the time to explain how the system functions will not only help your customers manage their expectations but will also reduce the likelihood of callbacks. Proper communication leads to satisfied clients — and happy clients are the foundation of a thriving business.
The importance of maintenance
Once installation is complete, and the unit is up and running, it’s essential to establish a maintenance routine to ensure the system’s longevity. A yearly tune-up is recommended, and it’s always a good idea to set up a maintenance schedule with the customer. Regular maintenance will reduce the chances of unexpected breakdowns and extend the life of the unit.
Make sure to log all information related to commissioning, maintenance, and any service calls. This not only ensures the unit is being properly maintained but also protects you as a technician going forward.
Upgrading to an air source heat pump can be a smart, long-term investment for homeowners looking to reduce their energy consumption and carbon footprint. However, the success of the installation depends on careful planning and consideration of several key factors, including the home’s existing heating system, electrical setup, and proper placement of the unit.
For technicians, understanding the intricacies of heat pump installation and educating customers about the process can lead to more satisfied clients. By effectively communicating, being upfront and taking the time to ensure proper installation, you’ll not only provide value but also build trust and credibility in the growing market for energy-efficient home comfort solutions.