A ducted heat pump — also called a central heat pump or forced-air heat pump — is a heating and cooling system that moves heat between the outdoors and indoors using refrigerant, and distributes the conditioned air throughout your home through a network of ducts, just like a conventional furnace and central air conditioner.

Unlike a gas furnace, which burns fuel to generate heat, a ducted heat pump extracts existing heat energy from outdoor air and transfers it inside during winter. In summer, it reverses the process — pulling heat out of your indoor air and releasing it outside, exactly like a central air conditioner. One system, one set of ducts, year-round comfort.

The key components of a ducted heat pump system are:

• Outdoor unit (heat pump): Houses the compressor, reversing valve, outdoor coil, and fan. This is the unit you see outside your home, similar in appearance to a central air conditioner.
• Indoor air handler: Installed inside your home — typically in the basement, utility room, or attic — the air handler contains the indoor coil and blower that circulates conditioned air through your ductwork.
• Refrigerant lines: Connect the outdoor and indoor units, carrying refrigerant back and forth to transfer heat energy.
• Existing duct system: The same network of ducts that your furnace and central AC use to distribute air throughout your home. A ducted heat pump works with your existing ducts in most cases.
• Thermostat: Controls the system and allows you to set your desired temperature. Most modern ducted heat pumps are compatible with smart thermostats.

The fundamental principle behind a heat pump is heat transfer, not heat generation. Rather than burning fuel or using electric resistance elements to create warmth, a heat pump moves heat that already exists in the outdoor air — even in very cold air — and delivers it to your living space. This is what makes it so much more efficient than conventional heating systems.

Heating Mode (Winter)

Even at -15°C or colder, outdoor air contains thermal energy that a heat pump can extract and put to work. Here is how the heating cycle works:

• Step 1 — Refrigerant absorbs outdoor heat: The outdoor unit circulates refrigerant through its coil. Even in very cold air, the refrigerant — which has an extremely low boiling point — absorbs the available heat energy and evaporates into a low-pressure gas.
• Step 2 — Compression raises the temperature: The compressor pressurizes the refrigerant gas, dramatically raising its temperature. This is where the energy input from electricity is used — not to create heat directly, but to drive the compression process that concentrates heat energy.
• Step 3 — Indoor coil releases heat: The now-hot, high-pressure refrigerant travels to the indoor air handler's coil. The blower pulls air from your home across the warm coil, heating it, and then pushes that warm air through your ductwork and into every room.
• Step 4 — Refrigerant returns and repeats: After releasing its heat indoors, the refrigerant expands, cools down, and returns to the outdoor unit to absorb more heat and repeat the cycle continuously.

Cooling Mode (Summer)

In cooling mode, the reversing valve switches the direction of refrigerant flow, and the system operates like a conventional central air conditioner:

• Step 1 — Indoor coil absorbs heat: The refrigerant in the indoor coil absorbs heat from the warm air inside your home, cooling the air as it passes over the coil.
• Step 2 — Compression and heat concentration: The refrigerant is compressed outdoors, concentrating the absorbed heat.
• Step 3 — Outdoor coil releases heat: The outdoor coil releases the collected heat into the outside air, which is why you can feel warm air blowing from the outdoor unit during cooling operation.
• Step 4 — Cool, dehumidified air is distributed: The now-cooled and dehumidified air is pushed through your ductwork by the blower and delivered to every room in your home.

The Reversing Valve — The Key to Dual-Mode Operation

The component that makes a heat pump different from a standard air conditioner is the reversing valve — a four-way valve in the outdoor unit that controls the direction of refrigerant flow. In heating mode, refrigerant flows one way. In cooling mode, the reversing valve switches and refrigerant flows the other way. This is why a single system can perform both functions, with no separate heating unit required.

Most modern ducted heat pumps — including all brands carried by Constant Home Comfort — use inverter-driven compressors rather than traditional single-speed compressors. This is one of the most important technical distinctions worth understanding as a buyer.

A traditional compressor operates in one of two states: fully on or fully off. When your home needs heating or cooling, it runs at full power until the thermostat is satisfied, then shuts off completely. This on-off cycling is inefficient and creates temperature swings — the room gets too warm or too cool before the system kicks back in.

An inverter compressor adjusts its speed continuously based on how much heating or cooling the home actually needs at any given moment. On a mildly cold day, it runs slowly and quietly, delivering just enough output to maintain the set temperature. On the coldest day of the year, it ramps up to maximum capacity. The benefits are significant:

• Significantly higher energy efficiency — inverter systems use considerably less electricity than single-speed systems over a full season
• More consistent, stable temperatures throughout the home — no hot and cold swings
• Quieter operation — the system rarely runs at full speed
• Less mechanical stress on components, contributing to longer system life
• Faster temperature recovery when you change your thermostat setting

One of the most common questions Ontario homeowners have about heat pumps is whether they can handle the cold. The short answer for modern cold-climate models: yes, absolutely.

Older or entry-level heat pump models lose heating capacity as outdoor temperatures drop below 0°C and may stop operating effectively at around -15°C. For Ontario's winters — where temperatures regularly reach -15°C to -25°C in the GTA and colder further north — these basic models require a fossil fuel backup to function reliably.

Cold-climate ducted heat pumps, including models from Lennox, Daikin, Bosch, and American Standard available through Constant Home Comfort, are engineered specifically to address this limitation. Using enhanced vapor injection technology and advanced compressor designs, these systems maintain full or near-full heating capacity at outdoor temperatures as low as -25°C to -30°C. For most Ontario homes, a properly sized cold-climate heat pump can serve as the primary — or sole — heating system throughout the winter.

It is worth noting that in extreme cold, a heat pump's efficiency (measured as COP — coefficient of performance) does decrease compared to its performance at moderate temperatures. This is normal and expected. A well-designed cold-climate system still outperforms electric resistance heating even at -25°C, and typically outperforms gas heating from an operating cost perspective across the full Ontario heating season when electricity and gas prices are factored together.

Ducted heat pumps are evaluated using two seasonal efficiency ratings:

HSPF2 (Heating Seasonal Performance Factor 2): Measures heating efficiency across an entire season. An HSPF2 of 8.5 or higher is the current minimum standard for cold-climate certification; premium systems from Lennox, Daikin, and others achieve HSPF2 ratings of 10 or more. For comparison, electric baseboard heating has an effective HSPF2 equivalent of roughly 3.4 — meaning a heat pump delivers two to three times more heating output per dollar of electricity.

SEER2 (Seasonal Energy Efficiency Ratio 2): Measures cooling efficiency across an entire season. Modern ducted heat pumps typically achieve SEER2 ratings of 16 to 22+, which is comparable to or better than dedicated high-efficiency central air conditioners.

The practical result for most Ontario homeowners is a meaningful reduction in annual energy costs compared to electric heating, and often a reduction compared to natural gas heating depending on current utility rates — combined with the elimination of a separate cooling system entirely.

Both systems use the same underlying heat pump technology, but they distribute conditioned air differently and suit different home configurations. Here's a straightforward comparison:

Choose a Ducted Heat Pump If:

• Your home already has ductwork in good condition
• You want to heat and cool the entire home through a single central system
• You are replacing an aging furnace and central air conditioner and want a single system to do both jobs
• You prefer a mostly invisible installation — the indoor unit is concealed in a utility space, not mounted on a wall
• You want whole-home comfort delivered uniformly through your existing vents

Choose a Ductless Heat Pump If:

• Your home has no existing ductwork, or the ductwork is in poor condition or impractical to use
• You want to add heating and cooling to a specific room or zone without a major renovation
• You want independent zone control — different temperatures in different rooms simultaneously
• You are heating a home addition, basement suite, sunroom, or garage
• Your home is older and retrofitting ductwork would be cost-prohibitive or structurally complex

Many Ontario homeowners use both: a ducted heat pump as the primary whole-home system, with one or more ductless units to condition spaces that fall outside the main duct system, such as a finished basement, a detached garage, or a home addition. Constant Home Comfort can help you evaluate the optimal approach for your specific property.

Fuel source: A gas furnace burns natural gas. A ducted heat pump uses electricity — but uses it so efficiently that operating costs are often comparable or lower, especially as gas prices rise and electricity rates remain relatively stable.

Heat generation vs. heat transfer: A furnace creates heat by burning fuel — it is 80 to 98% efficient at converting gas into heat, but that's still bounded by 100%. A heat pump moves heat rather than creating it, achieving effective efficiencies of 200 to 400% — delivering two to four units of heat energy for every unit of electricity consumed.

Cooling: A gas furnace does not cool your home — you need a separate central air conditioner. A ducted heat pump heats and cools in one unit, eliminating the need for a separate cooling system.

Carbon footprint: As Ontario's electricity grid continues to shift toward cleaner sources, a heat pump's carbon footprint decreases over time. A gas furnace's carbon footprint is fixed by its fuel consumption.

Rebate eligibility: Ducted heat pumps qualify for significant government and utility rebates in Ontario — including Canada Greener Homes and Enbridge incentives — that are not available for gas furnace replacements.

Qualifying ducted heat pump installations in Ontario are eligible for some of the most substantial home energy incentives currently available:

• Canada Greener Homes Grant: Federal grants of up to $5,000 for homeowners who complete an EnerGuide energy audit and install qualifying cold-climate heat pump systems.
• Canada Greener Homes Loan: Interest-free financing of up to $40,000 for qualifying energy retrofits including heat pump installations, combinable with the grant.
• Enbridge Home Efficiency Rebate Plus: Rebates for Enbridge Gas customers transitioning from gas heating to qualifying heat pump systems. Rebate amounts vary based on system and current program terms.
• Municipal and utility programs: Additional incentives may be available through local utilities and municipalities depending on your location in Ontario.

Constant Home Comfort manages the rebate process on your behalf, ensuring all paperwork is filed correctly and you receive every dollar of savings available to you.

Lennox

Lennox ducted heat pumps deliver premium cold-climate performance down to -30°C, industry-leading efficiency ratings, and seamless smart home integration. Built for Ontario's demanding winters with exceptional reliability and long system life. The choice for homeowners who want the best.

Daikin

Daikin's central heat pump lineup combines the reliability of the world's largest HVAC manufacturer with advanced inverter technology and ENERGY STAR certification. Outstanding cold-climate capability, excellent warranty coverage, and a strong track record across Canadian climates.

Bosch

Bosch applies European engineering precision to the North American heat pump market. Their ducted systems feature high efficiency ratings, quiet operation, and are purpose-built for whole-home heating and cooling applications in demanding climates.

American Standard

A trusted North American brand with decades of proven performance. American Standard ducted heat pumps deliver reliable year-round comfort, solid efficiency ratings, and comprehensive warranty coverage at a competitive price point.

A ducted central heat pump is an excellent fit if your home already has ductwork and you are looking to replace or upgrade your heating and cooling system. It is particularly compelling if:

• Your furnace or central air conditioner is aging and due for replacement
• You want to reduce your home's carbon footprint and energy consumption
• You want to take advantage of available rebates and government incentives
• You are planning a home renovation that includes HVAC upgrades
• You want a single, modern system that handles both heating and cooling efficiently
• You are interested in improving your home's resale value with energy-efficient upgrades

The best way to determine whether a ducted heat pump is right for your specific home is to have one of our certified technicians assess your property, evaluate your existing ductwork, and provide a detailed recommendation and quote. This service is free, with no obligation.

Can a ducted heat pump work with my existing furnace?

Yes — and this is actually a very common configuration in Ontario. A dual-fuel system pairs a ducted heat pump with an existing gas furnace. The heat pump handles the majority of the heating load throughout the season, while the gas furnace serves as a backup for extreme cold below a set outdoor temperature threshold. This setup maximizes efficiency savings while providing the reassurance of gas backup on the coldest days.

Does my existing ductwork need to be upgraded?

In most cases, existing ductwork can be used with a ducted heat pump without significant modification. However, heat pumps move larger volumes of air at lower temperatures than gas furnaces, so duct sizing and airflow balance do matter. Our technicians assess your ductwork during the in-home consultation and flag any areas that may need attention to ensure optimal performance.

How long does a ducted heat pump installation take?

A standard ducted heat pump installation — replacing an existing furnace and central air conditioner — is typically completed in one full day by our certified installation team. More complex installations involving ductwork modifications, electrical upgrades, or dual-fuel configurations may take longer. We'll give you a realistic timeline during your consultation.

Will a ducted heat pump keep my home warm on the coldest Ontario days?

A properly sized cold-climate ducted heat pump from a reputable brand is designed to maintain comfortable indoor temperatures even at -25°C or colder. The key is correct sizing and selecting a cold-climate rated model — which is standard practice at Constant Home Comfort. We never install undersized equipment.

What is the lifespan of a ducted heat pump?

A quality ducted heat pump that is professionally installed and regularly maintained typically lasts 15 to 20 years. The outdoor compressor unit generally determines the system's lifespan, as it is the component under the most mechanical stress. Annual professional maintenance is the most effective way to maximize the life of your investment.

How does a ducted heat pump affect my home's resale value?

Modern, energy-efficient HVAC systems are increasingly valued by homebuyers, particularly as energy costs and environmental awareness continue to grow. A recently installed cold-climate heat pump — especially one with documented maintenance records and remaining warranty coverage — is a genuine selling feature that supports your asking price.

If you're ready to explore whether a ducted central heat pump is the right upgrade for your Ontario home, Constant Home Comfort is here to help. Our certified technicians provide free, no-obligation in-home consultations that include a full assessment of your home, ductwork, and heating and cooling needs — along with a transparent, all-in price and a clear breakdown of all available rebates.

We carry Ontario's best selection of ducted heat pumps from Lennox, Daikin, Bosch, and American Standard, and we back every installation with our workmanship warranty and ongoing service support.

Call us: 1 (888) 675-5907

Visit: constanthomecomfort.com

Serving Toronto, GTA, Hamilton, Ottawa, London, Barrie, Waterloo, Burlington, and all of Ontario.