This guide compares an air-source heat pump with a gas forced-air furnace, the combination behind many US heating comparisons. Electric resistance furnaces, oil and propane equipment are different cost comparisons. Ground-source heat pumps and water-based radiator systems also require a different installation assessment. Establish which equipment and distribution system you own before treating two prices as competing offers.
The heat pump provides cooling as well as heating
An air-source heat pump uses electricity to move heat between outdoor and indoor air. In winter, refrigerant absorbs heat outdoors and the system raises its temperature so that it can release heat indoors. In summer, the cycle removes heat from the home and releases it outside. ENERGY STAR’s explanation of the cycle describes how changing refrigerant pressure makes that transfer possible even when outdoor air feels cold.
A gas furnace burns fuel and transfers heat to air that a blower distributes through ducts. ENERGY STAR’s furnace definition identifies the burner, heat exchanger, blower and duct connections as parts of this forced-air system. A furnace does not itself provide summer cooling; a separate air conditioner can use the same distribution system.
That difference changes the useful purchase comparison. Replacing a failed furnace while keeping a sound air conditioner is one project. Replacing both ageing heating and cooling equipment is another. In the second case, compare a heat-pump installation with the complete furnace-and-AC alternative, including compatible indoor equipment. Comparing one outdoor unit with a furnace-only price leaves different services in the two totals.
Work out which parts of the existing system can stay
Start with the current system’s age, condition, service history and any rooms that are uncomfortable. If only one component has failed, ask what can be retained and what must change for the proposed equipment to work together. A heat pump may use existing ducts, but the indoor coil, air handler, controls and electrical work belong in the proposal rather than being assumed away.
If the house has no ducts, a ductless heat pump may serve rooms through indoor units connected to an outdoor unit. ENERGY STAR distinguishes ducted and ductless arrangements. Ask which rooms each proposed indoor unit will serve and how air will reach spaces behind closed doors. A quote for a few zones should be compared with the rooms it actually conditions, not automatically with a whole-house system.
A home on a shared district-heating network is a different case again. Our account of Poland’s district-heating transition concerns network investment and tariffs. It is not a guide to replacing an individual furnace. In an apartment or shared building, establish who owns the heating system and what alterations are possible before ordering equipment.
Match cold-weather capacity to the home’s heating demand
Modern cold-climate heat pumps can provide heating in freezing weather. The useful question is how much heat the particular system delivers at the outdoor conditions your home is designed for. Ask the contractor for a heating-load calculation and the proposed equipment’s capacity at the relevant low temperature. The model’s advertised ability to operate at a temperature does not tell you whether its output meets your home’s demand there.
The ENERGY STAR cold-climate criteria give a concrete reference point. They require a coefficient of performance of at least 1.75 at 5°F and heating capacity at that temperature of at least 70% of capacity at 47°F, measured under specified tests. Those are equipment qualification conditions. A house with a particular heat loss still needs a system selected to serve it.
Capacity is heat output over time; COP is delivered heat divided by electrical input at a stated condition. An efficient unit can still be too small for the house. Ask for both figures at the relevant winter temperature.
ENERGY STAR’s quality-installation guidance calls for sizing based on the home’s actual characteristics rather than a rule of thumb. That assessment should include planned insulation work. Ask the installer to explain whether the proposed system covers the design heating load, uses supplementary heat for part of it, or deliberately heats only selected zones. This gives you a meaningful description of what you are buying.
Compare the price of useful heat
A heat pump’s efficiency advantage does not fix the price of electricity relative to natural gas. Obtain your own utility rates and an estimate using the proposed system’s performance in your climate. The US Energy Information Administration’s conversion table lists one therm as 100,000 Btu and one kilowatt-hour as 3,412 Btu. That makes a therm approximately 29.3 kWh of fuel energy before furnace losses.
For an initial energy-cost comparison, heat-pump electricity cost per kWh of delivered heat is electricity price per kWh divided by COP. A gas furnace’s fuel cost on the same basis is gas price per therm divided by 29.3 and then by AFUE expressed as a decimal. AFUE describes the proportion of fuel energy converted to space heat. These relationships let an installer show how your rates affect the result without pretending that one national utility price applies to every home.
The calculation is a starting point for the energy component, not a complete annual bill. A seasonal estimate must reflect changing temperatures, heating demand, supplementary heat and system electricity use. Include applicable delivery charges in the energy rates and consider fixed gas-account charges separately, particularly if gas will remain connected for other appliances. Do not use one favourable COP measurement as the assumed performance for an entire winter.
Read the efficiency labels in their own units. HSPF2 describes seasonal heating output in Btu per watt-hour, while SEER2 concerns cooling; AFUE is a fuel-utilization percentage. These labels cannot be ranked simply by placing their printed numbers side by side. Ask for a heating-cost estimate and a cooling-cost estimate for the actual alternatives, with assumptions visible enough to revise when tariffs change.
Put insulation and ducts into the same plan
The building determines how much heating and cooling the equipment must supply. ENERGY STAR’s insulation guidance explains that reducing heat loss can reduce the work a heat pump must do and may allow a smaller system. If insulation or air sealing is already planned, tell the contractor before equipment is sized. Otherwise you may pay for capacity based on a building you intend to change.
Distribution matters for either technology. ENERGY STAR identifies duct leaks and poor connections as causes of wasted energy and uncomfortable rooms. Ask whether the quote includes evaluation and necessary repairs, especially where ducts pass through unconditioned spaces. Replacing the heat source while leaving a serious distribution problem can preserve the room-to-room discomfort that prompted the purchase.
Summer conditions deserve attention too when the heat pump will provide cooling. Our explanation of street surfaces and radiant heat shows why different heat measurements answer different questions. For this installation, ask how the building’s solar exposure, insulation and cooling load were assessed. A neighbourhood temperature headline cannot size the equipment for your rooms.
A dual-fuel system can retain a useful furnace
The choice can include keeping a suitable furnace and installing a heat pump in place of the air conditioner. ENERGY STAR’s dual-fuel guidance describes a system able to use the heat pump or a gas or oil furnace. This can be worth evaluating when the furnace has useful service left and cooling equipment is due for replacement.
Ask how the controls choose the heat source, how the switching temperature is set and what the operating-cost estimate assumes. Retaining the furnace also retains its maintenance and fuel connection. Price the controls, compatible components and service obligations as part of the system. Dual fuel offers flexibility; it adds equipment that must be installed and operated together.
A fully electric heat-pump proposal may instead use electric resistance backup. That is different from the heat pump’s compressor moving outdoor heat, and the estimate should show when the resistance equipment is expected to operate. Ask the installer to explain the backup capacity and controls. Neither a backup fuel burner nor a resistance heater is an automatic requirement for every home, and neither should appear as an unexplained afterthought in the quote.
Ask for complete installed proposals
Request written, itemized proposals for alternatives that meet the same heating and cooling needs. ENERGY STAR’s contractor guidance calls for a home evaluation and comparison of cost, efficiency and warranties. Its bid-comparison checklist provides a useful structure for asking what the installation includes.
The proposal should identify model numbers and included indoor and outdoor components, the planned capacity, ducts or zones, controls, electrical work, removal and disposal, any required venting or drainage work, permits, warranty terms and commissioning. A panel upgrade may be needed in a particular home; ask what assessment establishes that need and whether it is included. Do the same for any claimed ability to reuse existing equipment.
Keep the gross installed price visible before subtracting financial help. For a 2026 installation, do not assume the former federal Energy Efficient Home Improvement Credit is available. The IRS currently describes eligible improvements through December 31, 2025. Check current state, local and utility programs separately, including equipment eligibility, application timing and whether approval is required before work begins. Old promotional copy about a federal credit through 2032 should not be treated as a current discount.
If a proposal promises payback, ask what it compares with. Savings against resistance heating, an old inefficient furnace and a new efficient gas furnace can be different. So can replacing a working system early versus replacing failed heating and cooling together. Include financing terms and the period you expect to keep the home. A payback figure without those assumptions gives you little basis for choosing between actual bids.
Plan for the system you will maintain
Both options need attention after installation. ENERGY STAR recommends professional seasonal check-ups and filter care. A heat pump brings outdoor coils, refrigerant and condensate management into the service plan. A fuel-burning furnace adds combustion, heat-exchanger and gas or oil connection checks. Ask what routine service costs and which tasks the manufacturer expects the homeowner to perform.
Commissioning should establish that the installed system operates as designed. Ask for recorded airflow, relevant refrigerant checks, controls setup and any duct testing included in the contract. Confirm how supplementary or dual-fuel heat is enabled and how the thermostat should be used. Have the installer explain normal operation and what should prompt a service call, rather than leaving you to infer performance from how hot the air feels at a vent.
A furnace’s blower and controls use electricity too. Keeping a gas heat source should not be confused with having an independent power-outage heating plan. If continuity during outages is part of the project, raise that requirement explicitly so that any backup-power proposal is compatible with the installed equipment.
Decide before the next breakdown makes the choice urgent
If the air conditioner is near replacement and the furnace is still sound, obtain a dual-fuel heat-pump proposal alongside the conventional AC replacement. If heating and cooling both need replacement, compare the complete systems. If the furnace alone has failed and cooling is in good condition, include a furnace replacement as a real alternative rather than assuming the whole system must be discarded.
For each option, keep the same home assessment and comfort requirement in view. The decision becomes concrete when you have the winter-load calculation, low-temperature output, local energy assumptions, full installed price and service plan on the table. Choose the arrangement that meets those needs at a cost you can carry, with any backup and future replacement obligations already explained.
