Heating & Cooling·Heat pumps

How to compare a heat pump and a furnace (2026)

Partially verified

Quick Answer

To compare a heat pump and a furnace, look at your climate, what fuel is available, your existing ductwork and electrics, and whether you want heating only or heating plus cooling. In general, a heat pump can be a strong choice if you want one system for both heating and cooling and lower on-site emissions, while a furnace can suit colder conditions or homes that already have gas infrastructure. The best option depends less on the headline equipment type and more on how well the system is sized, installed and matched to your home.

Overview

A heat pump and a furnace both heat a home, but they do it in very different ways. A heat pump moves heat from outside to inside, and most common residential systems can also reverse to provide cooling. A furnace creates heat by burning fuel such as natural gas, LPG or oil, or by using electricity in some cases, and then distributes that heat through ducts. When comparing them, avoid focusing only on the appliance itself. Start with your local climate, because that affects how hard the system must work through winter. Then check what energy sources are available and reliable where you live, since some homes have gas service and others do not. Also look at your current setup: duct condition, insulation, air leakage, thermostat compatibility and electrical capacity can all affect real-world performance and cost. Comfort matters too. Furnaces often deliver hotter supply air, which some people prefer, while heat pumps usually provide steadier, longer heating cycles. Running cost is highly location-dependent because it depends on local fuel and electricity tariffs, not just equipment efficiency. If you are replacing an existing system, ask for a room-by-room heat-loss calculation and a written comparison of suitable options rather than choosing by brand or marketing claims alone.

Who this is for

Homeowners, landlords and property managers choosing between replacing or upgrading a central heating system.

What you’ll need

Recent energy bills
Basic details of your current heating and cooling system
Information on available fuels or electricity supply at the property
A reputable installer or HVAC contractor for a proper load calculation
Manufacturer literature for any models you are considering

Before you start

Check whether your home already has usable ductwork, whether you need cooling as well as heating, and whether your electrical service or fuel connection can support the new system. Also check local incentives, planning rules, efficiency requirements and any restrictions on fuel-burning appliances with your local authority or national energy body.

Step-by-step

1
Define what problem you are solving
Decide whether you are replacing a failed heater, lowering running costs, adding cooling, improving comfort, or reducing emissions. Write down your priorities in order, such as lowest up-front cost, best winter performance, quieter running, or one system for all seasons.
Why: A heat pump and a furnace can both be good choices, but not for the same reasons. Clear priorities stop you choosing a system that is strong in one area but poor in the one that matters most to you.
2
Assess your home and climate
Consider your local winter conditions, insulation level, draughts, window quality and the size and layout of the home. If you already have ducts, have them checked for leakage, damage and poor airflow. If you do not have ducts, note that some heat pump options can work without them, while a ducted furnace generally needs a suitable distribution system.
Why: The home itself often determines performance more than the equipment label. A leaky or badly insulated home can make either option less comfortable and more expensive to run.
3
Compare how each system works for your situation
Heat pumps are usually worth serious consideration if you want both heating and cooling from one system, especially if electricity is your main energy source. Furnaces are often considered where fuel-burning heat is common, where people prefer hotter supply air, or where an existing gas-based ducted system is already in place.
Why: This narrows the field to options that naturally fit your property and preferences instead of forcing a one-size-fits-all answer.
4
Ask for a proper load calculation and written proposal
Get quotations from qualified installers and ask each one for a heat-loss and, if relevant, cooling-load calculation based on your home, not a like-for-like replacement by guesswork. Ask them to explain the proposed system type, controls, filtration, any duct changes, and any electrical or fuel-supply work needed.
Why: Correct sizing is critical. Oversized or undersized systems can waste energy, cycle poorly, feel uncomfortable and wear out faster.
5
Compare total ownership factors, not just purchase price
Review expected maintenance, likely running cost based on local tariffs, system lifespan guidance from the manufacturer, warranty terms, filter requirements, and whether you may need future cooling. Also consider resilience: for example, how dependent each option is on electricity supply and what backup arrangements are practical in your area.
Why: The cheapest quote is not always the cheapest system to own. Ongoing energy use, servicing and future needs often matter more than the initial invoice.
6
Choose the option that matches your priorities and confirm installation quality
Once you pick a system, confirm the installer will follow manufacturer instructions, commission the system properly, set airflow and controls correctly, and provide handover documents. Ask for operating guidance so you know how to use the thermostat and maintain the system.
Why: Even high-quality equipment performs poorly if installed or commissioned badly. Good setup is essential for comfort, efficiency and safety.

Why this works

A fair comparison works because it matches the heating technology to the building, climate, fuel options and user priorities. Heat pumps and furnaces behave differently in terms of efficiency, comfort, infrastructure needs and maintenance, so the right choice comes from whole-system planning rather than a simple brand or price comparison.

Common mistakes to avoid

Comparing equipment only by purchase price and ignoring running cost, maintenance and future cooling needs
Replacing like for like without a proper heat-loss calculation
Assuming a heat pump or furnace will perform well with poor insulation or leaky ducts
Choosing based on very general climate advice without considering the exact model and local conditions
Ignoring electrical upgrades, flueing, ventilation or fuel-supply requirements

Troubleshooting

You cannot tell which system will cost less to run

Ask installers to estimate annual energy use using your home's load and your local utility tariffs, then compare the assumptions they used.

The quotes are difficult to compare

Ask each installer to quote the same scope where possible: equipment type, load calculation, ductwork changes, controls, commissioning, warranty and maintenance needs.

You want cooling but currently only have a furnace

Ask whether adding central air conditioning to a furnace setup is practical, and compare that combined approach against a heat pump that can heat and cool.

You are worried a heat pump will not keep up in winter

Ask for model-specific performance information for your local winter conditions and whether a backup or dual-fuel arrangement is recommended by the installer and manufacturer.

Compare your options

Heat pump

Best for: Homes that want one system for heating and cooling, properties without gas service, and owners focused on lower on-site emissions and efficient electric heating.

Pros: Can provide both heating and cooling; often very efficient because it moves heat rather than generating it directly; can pair well with cleaner electricity; available in ducted and ductless forms.

Cons: Performance and efficiency depend strongly on outdoor conditions and correct sizing; may need electrical upgrades or control changes; some people find the supply air feels less hot than furnace air; installation quality is especially important.

Furnace

Best for: Homes with existing ducted fuel-heating systems, areas where fuel-burning heating is common, and households that prioritise strong warm-air delivery in cold weather.

Pros: Can deliver very warm supply air; often integrates easily where gas ducted heating already exists; familiar technology with widely available service in many markets.

Cons: Heating only unless paired with separate cooling equipment; fuel-burning models need proper venting and combustion safety measures; on-site emissions are higher than for an electric heat pump; fuel availability and price volatility can affect running cost.

Dual-fuel or hybrid system

Best for: Homes that want a heat pump for milder conditions but a furnace as backup for colder periods or specific tariff situations.

Pros: Can balance comfort, flexibility and seasonal efficiency; may suit variable climates; can use the strengths of both technologies.

Cons: More complex system design and controls; may cost more to install; needs careful setup to switch between heat sources properly.

Option	Best for	Pros	Cons
Heat pump	Homes that want one system for heating and cooling, properties without gas service, and owners focused on lower on-site emissions and efficient electric heating.	Can provide both heating and cooling; often very efficient because it moves heat rather than generating it directly; can pair well with cleaner electricity; available in ducted and ductless forms.	Performance and efficiency depend strongly on outdoor conditions and correct sizing; may need electrical upgrades or control changes; some people find the supply air feels less hot than furnace air; installation quality is especially important.
Furnace	Homes with existing ducted fuel-heating systems, areas where fuel-burning heating is common, and households that prioritise strong warm-air delivery in cold weather.	Can deliver very warm supply air; often integrates easily where gas ducted heating already exists; familiar technology with widely available service in many markets.	Heating only unless paired with separate cooling equipment; fuel-burning models need proper venting and combustion safety measures; on-site emissions are higher than for an electric heat pump; fuel availability and price volatility can affect running cost.
Dual-fuel or hybrid system	Homes that want a heat pump for milder conditions but a furnace as backup for colder periods or specific tariff situations.	Can balance comfort, flexibility and seasonal efficiency; may suit variable climates; can use the strengths of both technologies.	More complex system design and controls; may cost more to install; needs careful setup to switch between heat sources properly.

Alternatives

Ductless mini-split heat pump if you do not have ducts or only need to heat and cool selected rooms
Boiler-based heating if your home already uses radiators or underfloor heating
Improve insulation and air sealing before replacing equipment, which may allow a smaller and more suitable system

Pro tips

Ask every installer to explain system sizing in writing rather than saying they will match your old unit
If comfort is a priority, discuss airflow, humidity control and noise levels, not just efficiency labels
Check whether rebates or incentives apply to heat pumps or high-efficiency heating in your area before deciding
If you already have ageing ducts, include duct repair or sealing in the comparison

Safety notes

Fuel-burning furnaces must be installed, vented and serviced correctly to manage combustion risks
Electrical work for heat pumps should be done by qualified professionals
Never rely on DIY modifications to gas lines, flues, refrigerant circuits or high-voltage wiring
Follow manufacturer maintenance instructions for filters and servicing

Legal & regulatory notes

Heating and cooling installations may be subject to building regulations, energy-efficiency rules, gas safety requirements, electrical standards, refrigerant handling rules and permit requirements. Exact obligations vary by country and locality, so check with your local authority and use appropriately licensed or certified installers where required.

What this guide does not cover: This guide helps you compare system types at a planning level. It does not replace a room-by-room heat-loss calculation, a site survey, model-specific performance data, or local regulatory advice.

Cost considerations

A heat pump can have a different up-front cost profile from a furnace, especially if electrical upgrades, duct changes or controls are needed. A furnace may look simpler to replace where compatible fuel service and ductwork already exist, but total cost depends on local fuel prices, maintenance, cooling needs and whether you would otherwise need a separate air-conditioning system.

Prefer to hire a professional?

If this job is beyond a confident DIY — or the work needs to be done by a licensed professional — you can find a verified heating & cooling specialist through Trade Directory (tradedirectory.co.nz), New Zealand's directory of real, verified trade businesses. Compare local tradespeople, read their details and request quotes before you commit.

Find a heating & cooling specialist on Trade Directory

Frequently asked questions

Is a heat pump always better than a furnace?+

No. A heat pump is often attractive because it can both heat and cool, but the better choice depends on climate, home condition, local energy tariffs, available fuels and the quality of design and installation.

Does a furnace provide cooling?+

Not by itself. A furnace is a heating appliance. Some homes pair a furnace with a separate central air-conditioning system that uses the same ductwork.

What if I live somewhere with cold winters?+

Do not assume either option is automatically unsuitable. Ask for model-specific performance information and a proper load calculation. In some homes, a dual-fuel approach may also be worth discussing.

Can I replace a furnace with a heat pump using existing ducts?+

Often yes, but not always without changes. The ducts, airflow, controls and electrical supply may need assessment and possible upgrades.

Which one is cheaper to run?+

That varies by local electricity and fuel prices, your climate, and how efficient the specific system is in real conditions. Ask for a written operating-cost estimate based on your home and local tariffs.

Sources & references

Guidance on this page is traced to documented sources. Last checked 24 September 2026.

CIBSE · industry
Supports the general importance of correct system design, load assessment and professional HVAC practice.

Core comparison principles stay fairly stable, but tariffs, incentives, equipment performance ranges and local regulations can change regularly.