How Does A Ducted Heat Pump Work With Existing Ducts?
A ducted heat pump adds an outdoor unit and an indoor air handler or coil that connects to the existing supply and return ducts. Every room with a floor or wall register gets heat, and the house gets central air conditioning in summer.
The air handler goes where the old furnace sits, or beside it. Many homes keep the oil furnace as a backup for the coldest nights, with a control that switches between the two.
Air Handler Or Add-On Coil: Two Ways To Go Ducted
There are two common ways to put a heat pump on existing ducts. The first replaces the furnace with an electric air handler that holds the indoor coil and the blower. Nothing burns in the house, and if oil is leaving, the tank can go too. The second keeps the furnace and adds a heat pump coil on top of it. The heat pump does most of the heating and the furnace takes over in deep cold. An add-on usually costs less up front, but it only works when the furnace is in good shape and its blower suits the coil. Which way makes sense depends on the age of the furnace and whether you want to be off oil for good.
Backup Heat For The Coldest Nights
Every ducted heat pump needs a plan for the few nights when it cannot carry the house alone, and for the defrost cycles when the outdoor coil sheds its ice. With an air handler, the backup is usually a set of electric heating elements inside it, sized to the house. With an add-on coil, the existing oil or propane furnace is the backup. The thermostat decides when the backup comes on, based on the outdoor temperature or how far the room has fallen behind. Set up well, the backup runs only when it has to. Set up badly, it runs far more than needed and the power bill shows it. The quote names the backup and how it will be controlled.
Are The Ducts Good Enough For A Heat Pump?
Not every set of ducts is ready for a heat pump, so we check them first. It delivers air that is warm rather than hot, and it has to move more of that air than an oil furnace does.
Small or leaky ducts in an older basement can starve the upstairs rooms. We look at duct sizes, return air and sealing during the free visit. If the ducts will not carry the airflow, the quote says so and offers a ductless option instead.
Ducts In The Attic Or Crawlspace
Ducts that run through a cold attic or a vented crawlspace lose heat before the air reaches the rooms. Because a heat pump delivers warm rather than hot air, those losses show up as cool rooms at the far end of the run. They also matter for rebates. Under the June 2026 Efficiency Nova Scotia guide, heat pump equipment installed in unconditioned space, such as ductwork through an unconditioned attic, is not eligible for the Home Energy Assessment or Moderate Income rebates. If your ducts run through a cold space, we point it out during the visit, and the quote shows whether sealing, insulating or rerouting is needed.
Does A Ducted Heat Pump Need A Panel Upgrade?
Some homes need an electrical panel upgrade before a ducted heat pump goes in, especially older homes with a 100-amp panel and electric backup heat. We check the panel during the heat pump visit and include any upgrade in the quote.
Electrical permits in Nova Scotia go through Nova Scotia Power Inspection Services, and the wiring work is done by an electrician under permit.
Thermostats And Controls
The thermostat on a ducted heat pump does more than set a temperature. It decides when to run the heat pump, when to bring on the backup and how hard the system should work. A thermostat built for heat pumps, or the controller made for the outdoor unit, keeps the backup from switching on every time you nudge the temperature up. Wi-Fi models let you check the house from your phone, which helps if you travel or keep a camp. Old furnace thermostats are usually not suitable. The quote names the thermostat that comes with the system and why.
Filters, Air Quality And Your HRV
A ducted heat pump moves more air through the house than an oil furnace, so the filter matters more. A clogged filter cuts the airflow, makes the system work harder and can trip the backup heat. Check it monthly through the heating season and change it when it looks grey. Many newer Cape Breton homes also have an HRV or air exchanger tied into the ducts. The heat pump and the HRV can share the ducts, but their controls need to be set up so the HRV does not undo the heat pump's work. We look at the HRV connection during the visit. Duct cleaning is worth doing before a new system goes on old ducts.
What Does A Ducted Central Heat Pump Cost?
The price of a ducted central heat pump is set after a free visit, because it depends on the size of the house, the state of the ducts and the electrical panel. Duct repairs and panel upgrades appear as their own lines on the written quote.
Ducted Heat Pump Rebates In Nova Scotia
As of October 30, 2026, a centrally ducted heat pump on Efficiency Nova Scotia's eligible list earns $500 a ton through the Home Energy Assessment, up to $5,000 per home, after a $199 assessment booked before the work. If your home is mainly heated by oil or another non-electric fuel and your income is under the limits, the Moderate Income Rebate adds $1,500 a ton, up to another $5,000; apply and get approved first. Slim-duct and mixed-ducted mini-splits are not eligible under either program. The National Heat Pump Rebate ($2,000, or up to $10,000 for low- to median-income households) opens in early 2027 for eligible installs from November 1, 2026.