Electric vs gas furnace

Electric vs gas furnace compares electric resistance heat with fuel combustion. A heat pump is a third type, not an electric furnace under this check. Decide from the home's load, offered service and full installed scope. Efficiency percentages alone cannot tell you which system will cost less to use.

An electric resistance furnace avoids a combustion vent but still needs a suitable power supply and duct network. A gas furnace needs an approved fuel and vent plan. Compare the same delivered heat with local rates. Then price the real service work. Neither a high efficiency label nor a low bare-unit price proves the lower whole-project cost.

Electric vs gas furnace: resistance and combustion heat

An electric furnace uses resistance elements to make heat. A gas furnace burns its approved fuel. Both can use a blower and ducts to carry heat to rooms. They do not share every supply, control or cabinet needs merely because both are called furnaces.

A heat pump uses electricity to move heat from another source. Its COP belongs in a separate column. Do not apply heat-pump performance to an electric resistance furnace, or use resistance use as a claim about all electric heating.

The table explains type, not a site approval. The bid must state the full model and house checks. A worksheet setting does not certify wiring, fuel supply or the retained duct system.

Installation and service readiness

Electric resistance can be a plausible swap where the power and ducts are already suitable. If the bid needs large service work, that work belongs with the unit price. A bare cabinet listing does not show the project's power readiness.

Gas can be a plausible route where the house has suitable fuel service and an approved vent plan. If service must be brought to the property, keep the utility answer separate from the furnace package. Do not make a new-service job look like a routine same-fuel swap.

Use electric furnace installation cost and gas furnace replacement cost for their respective US price context. Their ranges cover differing products and scopes. They are not a controlled experiment on the same house.

Ask which work is included, priced apart or unknown. A task can be unnecessary in a given project. But that needs a project answer. It should not become unnecessary merely because a US price table does not mention it.

For a fuel switch, keep the old supply retirement scope too. Replacing an oil furnace with resistance heat can still leave a tank task. Replacing gas can leave questions about other supplied appliances. The new heating cabinet does not explain those duties.

Efficiency versus fuel cost

Efficiency and price answer different questions. A system can use less purchased energy for a given heat duty but face a higher price per useful unit of heat. Read both terms before weighing bills.

AFUE is a seasonal furnace fuel-efficiency measure. It does not include every duct loss and does not give a local fuel tariff. The furnace efficiency guide explains that scope and the need to tie a rating to the full model.

The resistance calculation in this worksheet uses 3,412 BTU per kWh, following EIA's energy-unit guidance. It prices the stated heat at the element conversion scope. It does not promise that all purchased electricity reaches every room as useful heat.

Gas calculations use 100,000 BTU per therm. Divide the delivered heat by the stated AFUE before converting to therms. A gas input label and a delivered heating load are not the same number.

Do not compare a kWh price directly with a therm price. The units contain different energy amounts. Convert both routes to the cost of supplying the same delivered heat, with their efficiency scopes clear.

Electric vs gas furnace: equal-heat running cost

The worksheet compares three routes for the heat you enter: resistance, gas and a separate heat-pump scenario. Enter the same delivered heat demand for all three. Use a period-specific source and replace the past US rates with your own bill where possible.

For resistance, the variable-energy calculation is heat divided by 3,412, multiplied by dollars per kWh. For gas, it is heat divided by 100,000 and by AFUE, multiplied by dollars per therm. This is arithmetic on your stated inputs, not a forecast of weather or usage.

The heat-pump column also needs a COP range and declared resistance-backup share. It is useful as an option. But it does not change what "electric furnace" means here. Leave the result open when the needed performance inputs are missing.

The tool does not create yearly demand from your house area. It also does not turn a winter design load in BTU/h into annual BTU without a use model. Rate of heat loss and total heat over a season have different units.

Worked example: rates can reverse the choice

This hypothetical annual case needs 50,000,000 BTU of delivered heat. It uses gas AFUE 80%. Electricity is $0.173/kWh and gas is $1.4807/therm, the worksheet's editable past US references. No cooling or fixed fees are included.

These outcomes belong to those inputs only. They do not show your yearly demand or a US promise that one system has the smallest bill. Change the local rate or heat-pump performance and rerun the equal-heat case.

With the same heat and gas rate, increasing gas AFUE to 96% gives about 521 therms and $771. The heat-pump case at COP 3 remains about $845. The order of those two routes now differs from the first case.

This example separates resistance heat from a heat pump and separates gas performance from fuel price. A type label alone does not make the ranking. Nor does a difference in yearly variable use tell you what either full installed job costs.

Read the historical rate defaults correctly

The electricity reference is EIA's 2025 US residential average of 17.30 cents per kWh. The gas reference is $15.34 per thousand cubic feet, also for 2025. They are past US context, checked October 14, 2026, rather than current local offers.

EIA explains an approximate gas heat content of 1,036 BTU per cubic foot. On that stated approximation, one thousand cubic feet represents 10.36 therms. Dividing the published gas amount by that energy quantity gives about $1.4807 per therm.

Real gas heat content and your bill's conversion can differ. Use the billed therm rate when offered, rather than imposing the approximate US conversion. If your statement uses another unit, keep its conversion basis before entering dollars per therm.

Do not type a cents figure as though it were dollars. The electricity reference is $0.173/kWh, not $17.30/kWh. The distinction is visible in the field label because the formula multiplies by dollars per energy unit.

Fixed fees and shared-meter duties

A utility bill can include account fees as well as variable energy. The worksheet prices variable heating use. Fixed fees need a separate record because a fuel switch may keep, add or end an account depending on the other appliances.

If gas still supplies hot water or cooking, its account may remain after the furnace leaves. If gas is newly connected for heat, its service terms need a separate answer. Do not assume all fees vanish with one appliance or that every added account has the same charge.

Electricity also serves many household loads. A whole-house electric bill is not a metered furnace-use record. Keep cooling, water heat and ordinary household use separate before making claims about the heating system.

The fact that a model is highly efficient does not settle these scopes. A tariff, period and use record are needed alongside the technical rating. Keep them dated so a later rate change can be rerun without changing the unit facts.

Venting, maintenance and comfort

Resistance elements do not burn fuel, so they do not need their own combustion vent. The house may still have other fuel appliances with vent duties. A gas-to-electric project must account for what remains rather than simply crossing out all vent work.

For a gas furnace, use the exact model's approved supply and vent plan. DOE's direct-vent equipment guidance is technical background. This site does not give homeowner steps to alter combustion air or fuel or vents.

Ask for each new system's service instructions and service terms. Parts warranty, contractor labor coverage and a paid service plan are separate records. Do not treat a long parts term as a promise that all future service costs are included.

Comfort also depends on controls and duct network. A new heat source cannot by itself prove a cold room will improve. Keep room loads, supply/return layout and blower setup in the project record when uneven heat is part of the reason for replacing the unit.

Cooling and the retained blower

Both furnace options may share a blower with central cooling. A heating quote should state whether the cooling coil and outdoor unit remain. If the blower or coil match changes, keep the new system record with the heating bid.

Use central AC installation cost for separately changed cooling work. Do not add an entire AC package to a furnace bundle that already includes it. A shared coil or shared install task belongs in the total once.

If the real option is a reversible heat pump, compare its heating and cooling package with the full furnace-plus-AC route. Weighing a full heat pump with a furnace-only amount hides part of the furnace route's cooling duty.

That fuller check appears in heat pump vs air conditioner cost. Its purpose is to align the duty, not to declare every heat pump cheaper than every other system.

Decision table for the house

Start with readiness. Then compare money. A favorable running-cost scenario is not enough if the supply or duct network plan is open. A low installed figure is not enough if it omits a needed service change.

ACCA Manual J and Manual S keep load and selection separate. The sizing tools help read the units. They do not approve the house's power or fuel service.

Keep each workable route's quoted parts and labor terms on the same sheet. A less familiar brand with a clear local service setup can be easier to check than a family with a high rating and missing scope. This is a bid-quality question, not a reliability ranking.

Separate first cost from yearly use

An installed amount is paid for the project. Yearly variable use belongs to a stated period. Keep the two records separate before working out any simple payback or ownership scenario.

Do not use the gap between two US guide midpoints as a measured price premium for your home. Those ranges may cover different scopes and households. A payback case should begin with equal-scope written bids and a stated annual-use difference.

If the yearly saving range crosses zero, a finite recovery time is not assured across the inputs. A low installed price does not make negative yearly savings positive. Keep that outcome visible rather than choosing a favorable rate just to make an attractive number.

The payback tool shows this logic for gas AFUE changes. It keeps the premium and yearly saving apart. It does not price every electric/gas fuel switch. It does not predict later service costs. Use the actual complete bids and a stated use period for that choice.

Find the break-even variable-energy rate

A break-even calculation can show why local rates matter without forecasting a house's demand. At equal delivered heat, resistance cost per BTU is electricity dollars per kWh divided by 3,412. Gas cost per BTU is gas dollars per therm divided by 100,000 and by AFUE.

Set those two expressions equal to find the electricity rate that would make their variable heating costs equal under the stated scopes. This is a rate link, not a full annual bill or installed-cost check. Demand cancels because both routes supply the same declared heat.

With gas at $1.4807/therm and AFUE 80%, the equal-cost electricity rate is about $0.0632/kWh. The worksheet's past electricity reference is higher than that threshold. That explains the resistance-versus-gas ordering in the worked example, without claiming the threshold applies to every tariff.

At gas AFUE 96%, the corresponding resistance threshold is about $0.0526/kWh. Better fuel conversion changes the link. The result still excludes duct network losses, fixed fees and unknown other loads.

Do not use this threshold as a heat-pump check. A heat pump has a COP and backup-share term. Do not use it to choose a panel or furnace size either. Those choices need the real design and supply records.

Choose a rate range that represents the question

If a tariff varies, keep a declared low and high rate with a clear period. The tool uses that range alongside demand and performance inputs. The corners are arithmetic scenarios, not statistical bounds or predictions of next year's price.

A billed average can be useful when its scope is clear. A marginal rate can answer a different question about extra use. Keep the chosen meaning in the source field so a reader can understand what was priced. This site does not choose the tariff method from the unit label.

If a fixed fee is included in a bill-derived average and then added again as a separate fee, it can be counted twice. Keep rate and fee treatment consistent. If the treatment is unknown, state the unknowns instead of claiming a full bill result.

Preserve heating demand when comparing scenarios

Run the same declared delivered heat through each route. Changing demand on only one side can make a type look better without a comparable duty. A future insulation project can be a separate scenario, with the lower demand applied to every workable heating route.

Do not multiply a peak winter load by every hour in a year and call it yearly demand without a use model. A design load represents a stated state. Annual delivered heat is a cumulative period quantity. The worksheet labels those units apart for that reason.

If demand is unknown, the break-even rate can still explain the variable-energy link. The annual dollar amounts should remain open. A precise unit-price check does not supply the missing house-use record.

Compare conversion duties after the rate result

A favorable variable-cost case does not price a fuel connection or power change. Keep those installed tasks in a separate full scope. Keep the old fuel source's retirement and any remaining-appliance duties too.

If one route serves both new heating and cooling while another serves heating only, align the duties before working out a project premium. Keep a new heat pump separate from resistance heat in that check. The same word electric can otherwise hide two different source types.

FAQ

Is an electric furnace the same thing as a heat pump?

No. Here the electric furnace uses resistance heat. A heat pump moves heat and needs a COP record for its stated conditions. The worksheet shows both routes apart. Do not copy the heat-pump column into a resistance-furnace budget just because both buy electricity.

Does nearly complete resistance conversion make it the least costly heat?

Not by itself. The energy-unit price and the heat duty still matter. Compare dollars per unit of useful heat with the gas efficiency scope clear. Distribution and fixed charges have further limits. An efficiency percent alone cannot decide the bill.

Can I enter annual therms as delivered heat?

Purchased therms are fuel input. Apply the stated furnace efficiency scope to budget delivered heat before using an equal-heat check. Keep other gas uses out. If the old AFUE or heating share is unknown, a precise yearly result is not shown by the bill alone.

Can a furnace price decide whether a panel upgrade is needed?

No. A unit price does not check the home's power service. Look for a stated supply check and a separate written scope if supply work is needed. This site does not infer wiring or breaker sizes from heating kW, house area or a US cost guide.

Should I add an extra labor allowance to either installed range?

Only for genuinely separate work outside its stated scope. Installed ranges already include fitting work. An assumed hours-times-rate charge added to the same job can double count it. Use real non-overlapping bid lines, and keep unpriced service changes unknown.

Sources and corrections

Technical units follow EIA, with the past rates and approximation stated above. Efficiency scope follows the DOE furnace purchasing guide and ACCA load/choice records. These sources were checked October 14, 2026. Price observations keep their own dates on the linked budget pages.

The check uses published facts and clear arithmetic. It does not claim hands-on tests, a local quote or a service-safety check. Use contact for a fix with the source and unit and statement that need changing.

Verdict: compare electric vs gas furnace at equal heat

Electric vs gas furnace is a whole-project choice, followed by an equal-heat cost calculation. Keep service readiness and cooling duties in the installed scope. Use real rates for the period, keep resistance heat separate from heat-pump performance and leave unknowns visible. Compare the workable routes in system choices before using the main budget worksheet.