Heat pumps are the fastest-growing segment in residential HVAC — and the most misunderstood. Many homeowners have heard they’re efficient but aren’t sure how they work, whether they’re appropriate for a Canadian winter, or what questions to ask when an HVAC contractor recommends one. This guide addresses all of that.

“The question I get most from homeowners considering a heat pump is ‘will it work in winter?’ The answer in 2025 is unequivocally yes — modern cold-climate heat pumps are rated to -30°C and provide full heating capacity at temperatures where older models would have struggled. The more relevant questions are about sizing, backup heat, and whether the contractor actually knows how to install and commission a heat pump correctly. Not everyone does.”

— Sandra Kim, HVAC system designer and mechanical engineering technologist with 14 years of experience in residential load calculation and system optimization in the local area

Understanding Heat Pump Basics

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A heat pump moves heat rather than generating it — extracting heat energy from outdoor air (even cold air) and moving it inside to heat the home, then reversing the process in summer to cool. Modern cold-climate heat pumps operate efficiently at temperatures as low as -25°C to -30°C, making them viable across most of your country.

There are two main residential configurations:

Air-source heat pump (ASHP): An outdoor unit connected to an indoor air handler, replacing or supplementing a traditional furnace and AC. The most common residential option.

Mini-split (ductless) heat pump: An outdoor unit connected directly to one or more indoor wall-mounted or ceiling cassette units, without ductwork. Ideal for additions, rooms without duct access, or whole-home zoning.

Questions About Whether a Heat Pump Is Right for Your Home

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Is my home a good candidate for a heat pump?

Not every home is equally suited to a heat pump as a primary heating system. Factors that affect suitability include: existing ductwork condition, insulation levels, window area, and whether you’re willing to keep a gas furnace as backup. Ask the contractor to assess your home’s specific characteristics before recommending a heat pump.

Will a heat pump fully replace my furnace, or do I need a hybrid system?

A full heat pump system replaces the furnace entirely, relying on the heat pump for all heating (with electric resistance backup for extreme cold). This is appropriate for well-insulated homes in moderate climates or where the heat pump is rated to very low temperatures.

A hybrid system pairs a heat pump with an existing gas furnace. The heat pump handles most of the heating load efficiently; the furnace takes over at a defined outdoor temperature (the “balance point”) where it becomes more cost-effective than the heat pump. This is often the most practical option in many regions and other cold-climate regions.

Ask which configuration is being recommended for your home and why. Ask specifically what the system’s balance point is and how it’s determined.

What a good answer looks like: A specific recommendation based on your home’s insulation, your existing equipment, and local energy prices — not a generic “heat pumps are great” answer.

What is the cold-climate rating of the heat pump being proposed?

Not all heat pumps are created equal for Canadian winters. Look for NEEP (Northeast Energy Efficiency Partnerships) cold-climate certified heat pumps, which are rated to maintain meaningful heating capacity at -15°C and below. Ask the contractor what the specific low-temperature performance rating of the proposed unit is.

What a good answer looks like: A NEEP cold-climate certified model with a published low-temperature heating capacity specification.

Questions About Sizing and Performance

Has a Manual J load calculation been done for my home?

Proper heat pump sizing requires a Manual J calculation — the same load calculation used for furnace sizing. An oversized heat pump short-cycles; an undersized one can’t maintain comfort on the coldest days. Ask specifically whether a Manual J was performed.

For more on sizing: Questions to Ask an HVAC Contractor About Equipment

What SEER2 and HSPF2 ratings does this unit have?

SEER2 measures cooling efficiency; HSPF2 (Heating Seasonal Performance Factor) measures heating efficiency. Higher numbers mean lower operating costs. Ask for both ratings for the proposed unit. Heat pumps that qualify for federal rebates must meet minimum efficiency thresholds — ask whether the proposed unit qualifies.

What rebates are available for this heat pump?

The a national energy-efficiency rebate program and regional programs (including your region’s Home Efficiency Rebate Plus) offer significant rebates on qualifying heat pump installations — sometimes $2,500–$6,500 or more. Ask specifically which programs apply to the proposed unit, what the rebate amounts are, and what conditions must be met (pre- and post-installation energy audits are often required).

What a good answer looks like: Specific rebate programs identified by name, with the expected rebate amounts and any conditions explained clearly.

Questions About the Installation

Are you experienced with heat pump installation specifically?

Heat pump installation has meaningful differences from standard furnace/AC work — particularly for cold-climate units, which have specific refrigerant requirements and commissioning procedures. Ask how many heat pump installations the contractor has completed in the last 12 months and whether they’re certified by the manufacturer for the brand being proposed.

What will happen with my existing ductwork?

Heat pumps typically operate at lower air temperature than furnaces — the supply air may be 35–40°C rather than 55°C. This means heat pumps need to move more air to deliver the same amount of heat, which requires properly sized and sealed ductwork. Ask whether your existing ductwork will be assessed and whether any modifications are needed.

What backup heat is included, and how does it operate?

Ask specifically what happens when outdoor temperatures drop below the heat pump’s rated performance range. Is there electric resistance backup built into the air handler? Is the existing gas furnace being kept as backup? How does the system switch between heat sources, and is it automatic?

What a good answer looks like: A clear explanation of the backup heat configuration, how the switchover works, and what the operating cost implications are.

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