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Heating · Fuel ConversionOil to Heat Pump Conversion
An oil to heat pump conversion replaces the oil furnace with a cold-climate heat pump and a ducted air handler with electric backup, reusing the existing ducts where static pressure allows. A 3-ton cold-climate system installs for $9,500–$15,000 before rebates, electrical work is itemized separately, and both rebate programs for oil-heated homes require approval before installation day.
The equipment is simple to describe. The oil furnace comes out and a ducted air handler takes its place: a blower, the heat pump's indoor coil and electric resistance strips for backup, with a variable-speed cold-climate unit outside on a stand above the snow line. The heat pump carries the house through most of the winter and the strips cover the coldest hours and the defrost cycles. Where the electrical service cannot carry full strip backup, the alternative is a heat pump over a propane furnace, covered under hybrid heat pump systems.
Ductwork is the first check. Oil furnaces delivered very hot air, so a house could be heated with modest airflow; a heat pump delivers cooler air and needs more of it to move the same heat. We measure total external static pressure on the existing ducts and compare it with what the air handler is rated for, and generous oil-era trunks often pass. Where they do not, the usual fixes are a larger return drop, a second return or a rebuilt plenum, priced before you sign; can a heat pump use my existing ductwork explains the test.
The electrical side is where oil conversions differ from gas ones. The outdoor unit needs its own 240-volt circuit and the backup strips need another: a 15 kW strip bank alone draws a little over 60 amps. Add a well pump, a water heater and a range and a 100-amp service is out of room, which is why a 200-amp service is often part of the job, confirmed by a load calculation. The service and panel work are done by a licensed electrical contractor under an ESA permit and coordinated with the utility, which is Hydro One on most rural Caledon and Flamborough roads; electrical panel upgrades for heat pumps sets out the thresholds.
Two rebate routes exist for an oil-heated house, and both have steps to finish before installation. The federal Oil to Heat Pump Affordability program is income-tested and asks for proof that oil is the main heating fuel, such as recent delivery invoices. Ontario's Home Renovation Savings Program pays its higher, non-gas rate to oil-heated homes and needs its approvals in place first, so installing early forfeits the money. Amounts, income thresholds and whether intake is open are on the Oil to Heat Pump Affordability program page, and we prepare the equipment and invoice documents for both.
This conversion fits when
- There is no gas main on your road, or the Enbridge connection quote is out of reach
- The oil tank is near the end of its insurable life and you would rather not buy another
- The house has ductwork in fair condition and room outside for a unit on a stand
- You heat with oil today and can show delivery invoices for the rebate applications
- You want central cooling as well, which the same heat pump provides with no extra equipment
How it works
A room-by-room heat-loss calculation, a static pressure test, an electrical load calculation, and the rebate applications started. Nothing is installed until the approvals are in hand.
The electrical contractor completes the service or panel work under an ESA permit. Then the oil furnace comes out, the air handler and outdoor unit go in, and the system is commissioned in heating and cooling.
A TSSA-registered fuel-oil contractor removes the tank and the exterior fill pipe once the heat pump is running; that work is not ours and is quoted by them. We submit model numbers and invoices to the programs and set the backup-heat lockout. Book a conversion site assessment.
Brands: For oil conversions we install cold-climate heat pumps from Mitsubishi, Daikin, Fujitsu, Lennox and Carrier.
Common questions
Will a heat pump keep an old oil-heated farmhouse warm?
Yes, if it is sized from a heat-loss calculation and the backup is adequate. A cold-climate unit keeps producing heat at −25°C, but its output falls as the temperature drops, so ask for the manufacturer's capacity at −15°C and −25°C against your home's heat loss. Century farmhouses often benefit from attic insulation and air sealing first, which shrinks the system you need.
Do I have to upgrade to 200 amps?
Not always. A smaller house with modest electrical loads, a smaller strip bank or a load-management device can sometimes stay on 100 amps. A load calculation by the electrical contractor decides it, not a rule of thumb. On rural properties with a well pump, an electric water heater and an electric range, 200 amps is the usual outcome.
Can I keep the oil furnace as backup?
Mechanically it can be done, but it works against the oil-specific funding, which is built around getting off oil, and it leaves you with the tank, the inspections and the insurance questions. If you want fuel backup for outages, a propane furnace under the heat pump coil is the cleaner way to get it. Check with the program before installing any fuel backup.
What happens during a power outage?
A heat pump with electric backup makes no heat without power, and strip heat is too large a load for most portable generators. If your road loses power regularly, plan for it at the design stage: a standby generator sized for the heat pump without strips, a propane furnace as backup, or a wood stove you already trust. We raise this on the first visit.
How long does an oil to heat pump conversion take?
The installation is a multi-day project, longer when a service upgrade is involved. The calendar is driven by approvals: rebate pre-approval, the ESA permit and any utility scheduling for a service change all come first. Starting in spring or summer leaves room for those, and means the house is not waiting on paperwork with a near-empty oil tank in November.