How long does an AC last?

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

The U.S. Department of Energy (DOE) used an average lifetime of 21.2 years for central air conditioners in its 2017 rule (2017 rule, data 1983-2009, read 2026-10-17, national, n not published by the source), and 18.0 years in its hot-humid climate region (2017 rule, data 1983-2009, read 2026-10-17, hot-humid climate region, n not published by the source).

Source: DOE 2017 central air conditioner and heat pump rule, read 17 October 2026.

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From the public microdata of the 2020 home energy survey by the U.S. Energy Information Administration (EIA), 19.7% of US households with main air conditioning equipment had that equipment 15 or more years old (EIA RECS 2020, read 2026-10-17, n = 16,171, SE 0.4 points); among Florida households with main air conditioning equipment the share was 12.6% (EIA RECS 2020, read 2026-10-17, n = 628, SE 1.4 points). EIA imputed (filled in statistically) the age for 11.2% of the US households counted and 11.1% of the Florida ones. InstaBids tallied both, and they count units that were running at the time, so they are no measure of lifespan.

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

For its “Central Air Conditioners” row, DOE's averages by climate region are 24.1 years in the North climate region (2017 rule, data 1983-2009, read 2026-10-17, North climate region, n not published by the source) and 24.9 years in the hot-dry climate region (2017 rule, data 1983-2009, read 2026-10-17, hot-dry climate region, n not published by the source), both lifetimes DOE used in its 2017 rule.
The U.S. Department of Housing and Urban Development (HUD) lists 15 years for the row “Electric AC condenser, pad or rooftop” in both its Family and Elderly columns (structured on the ASTM E2018-08 outline, no issue date, read 2026-10-17, national, multifamily, n not published by the source). That is HUD's standard planning life for the condenser alone in multifamily capital needs assessments, not a measured life of a whole home system, so it is not the same measure as DOE's figures for the complete central air conditioner.

ENERGY STAR, run by the U.S. Environmental Protection Agency (EPA) together with DOE, gives an age for air conditioners as guidance rather than as a lifetime: its list of signs that it may be time to call a contractor includes “Your heat pump or air conditioner is more than 10 years old.” (no issue date, read 2026-10-17, national, n not published by the source).

In Florida

Narrowed to central systems, 12.8% of Florida households whose main air conditioning equipment is a central air conditioner had one 15 or more years old (EIA RECS 2020, read 2026-10-17, n = 597, SE 1.4 points), and 33.1% had one 10 or more years old (EIA RECS 2020, read 2026-10-17, n = 597, SE 1.9 points); EIA's survey files central heat pumps under the same code, and EIA imputed the age for 10.7% of these households counted.

Counting every type of main cooling equipment (central systems, ductless mini-splits, window or wall units, portable units and evaporative coolers), 32.1% of Florida households with main air conditioning equipment had it 10 or more years old (EIA RECS 2020, read 2026-10-17, n = 628, SE 1.8 points).

Get written bids

Replacement figures live on a different page, sourced on their own: How much does AC replacement cost?

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Sources for the figures on this page

U.S. Department of Energy, Energy Conservation Program: Energy Conservation Standards for Residential Central Air Conditioners and Heat Pumps, direct final rule, 82 FR 1786 (January 6, 2017), Table IV-16, p. 1819, 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.