How long does a furnace last?

Name: U.S. Energy Information Administration, 2020 Residential Energy Consumption Survey (RECS), public-use microdata file v7
Creator: U.S. Energy Information Administration

In its 2023 furnace rule, the U.S. Department of Energy (DOE) used an average lifetime of 21.5 years for non-weatherized gas furnaces and mobile home gas furnaces (2023 rule, data 2006-2022, read 2026-10-17, national, n not published by the source).

Source: DOE 2023 consumer furnace rule, read 17 October 2026.

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In 2020, 31.9% of US households whose main space heating equipment is a central furnace had a furnace 15 or more years old (EIA RECS 2020, read 2026-10-17, n = 11,511, SE 0.5 points). For Florida households in the same group the figure was 21.5% (EIA RECS 2020, read 2026-10-17, n = 220, SE 3.0 points). We computed both, across every furnace fuel, from the public microdata of the 2020 home energy survey by the U.S. Energy Information Administration (EIA); EIA's imputed values (filled in statistically) stand in for the age of 12.6% of the US furnace households counted and 13.6% of the Florida ones. For gas and propane furnaces alone, 31.7% of US households whose main space heating equipment is a central furnace burning natural gas or propane had it 15 or more years old (EIA RECS 2020, read 2026-10-17, n = 8,955, SE 0.6 points), and EIA imputed the age for 11.2% of those households counted. A furnace still heating a home is a survivor, so these are ages, never lifetimes.

Researched by the InstaBids editorial team. Last checked: 17 October 2026 Updated 2026-10-17

In our own counts, n is the number of surveyed households behind a share and SE is its standard error, a measure of sampling error, in percentage points.

How long it lasts, by source

The same rule splits gas furnaces by DOE region: the average lifetime DOE used is 22.5 years in “the North” (2023 rule, data 2006-2022, read 2026-10-17, North region, n not published by the source) and 20.2 years in “the rest of country” (2023 rule, data 2006-2022, read 2026-10-17, outside DOE's North region, n not published by the source), both in its 2023 rule. The rule covers gas furnaces only, “specifically non-weatherized gas furnaces and mobile home gas furnaces.”
Capital needs assessments of multifamily buildings by the U.S. Department of Housing and Urban Development (HUD) plan on 20 years for “Gas furnace/air handler”, in family and elderly housing alike (structured on the ASTM E2018-08 outline, no issue date, read 2026-10-17, national, multifamily, n not published by the source). It is a planning standard for those buildings, not a measured life of a home furnace.

How long one gas furnace lasts depends on its operating hours and its own condition.

For furnaces, ENERGY STAR, a program of the U.S. Environmental Protection Agency (EPA) and DOE, gives an age only as a prompt, not as a lifespan: among the signs that it may be time to call a contractor, it lists “Your furnace or boiler is more than 15 years old.” (no issue date, read 2026-10-17, national, n not published by the source).

In Florida

Set the bar at 10 or more years old and the Florida share rises to 39.0% of the state's households whose main space heating equipment is a central furnace (EIA RECS 2020, read 2026-10-17, n = 220, SE 3.5 points).

Taking every kind of main heater together, heat pumps included, 16.1% of Florida households with main space heating equipment had it 15 or more years old (EIA RECS 2020, read 2026-10-17, n = 483, SE 1.7 points).

Get written bids

For the price side of a new furnace, see the cost guide, which cites its own data: How much is a new furnace?

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Sources for the figures on this page

U.S. Department of Energy, Energy Conservation Program: Energy Conservation Standards for Consumer Furnaces, final rule, 88 FR 87502 (December 18, 2023), section IV.F, read 17 October 2026. U.S. government work, public domain.
U.S. Energy Information Administration, 2020 Residential Energy Consumption Survey (RECS), public-use microdata file v7, read 17 October 2026. U.S. government work, public domain; EIA credited as the source. Microdata file: recs2020_public_v7.csv.
U.S. Department of Housing and Urban Development, CNA e-Tool Estimated Useful Life Table, read 17 October 2026. U.S. government work, public domain.
ENERGY STAR (U.S. EPA / DOE), When is it time to replace?, read 17 October 2026. U.S. government work, public domain.