Uniformat D3020

Furnace, gas-fired

Also called furnace, forced air furnace, gas furnace

• Confidence C
• Version 0.3.0 (permanent link)
• Reviewed 2026-10-21

Service life

Years in service. The band runs from the shortest to the longest life the sources state, so it shows how much they disagree, not how long 80% of units last. The line is the median of the stated lives.

Basis

• 20 years · CNA e-Tool Estimated Useful Life Table, p12 · HUD CNA 3.4.3.1.4 “Gas furnace/air handler” — U.S. Department of Housing and Urban Development (planning life)
  Same life for family and elderly properties. US multifamily housing. The municipal rows say furnace without naming the fuel.
• 15 years · The Blue Mountains: POL.COR.19.04 Tangible Capital Assets Policy, p11 · “Furnace” (accounting life)
  Capital asset policy (amortization period). Approved on text check: the label and value were found on the cited page.
• 15 years · Grey Highlands: By-law No. 2026-052, Tangible Capital Asset Policy A09-F-03, p11 · “Furnace” (accounting life)
  Capital asset policy (amortization period). Approved on text check: the label and value were found on the cited page.
• 15–25 years · Meaford: By-law 2020-83, Tangible Capital Asset Policy, Appendix A Estimated Useful Lives, p17 · “HVAC - Furnace” (accounting life)
  Capital asset policy (amortization period). Approved on text check: the label and value were found on the cited page.
• 23 years · Energy Conservation Program for Certain Industrial Equipment: Energy Conservation Standards for Small, Large, and Very Large Air-Cooled Commercial Package Air Conditioning and Heating Equipment and Commercial Warm Air Furnaces (direct final rule), 81 FR 2420, January 15, 2016, p4 · “"the average lifetime of the equipment, which is estimated to be 23 years for both gas-fired and oil-fired CWAFs"” — U.S. Department of Energy (planning life)
  Printed page 2423. class: commercial warm air furnaces >=225,000 Btu/h input, gas-fired and oil-fired. Commercial, mostly weatherized/rooftop-mounted; residential furnaces are covered separately (consumer furnace rule). Lifetime derived from the CUAC lifetime (section IV.F.6.b, p.60, printed 2479).
• 21.5 years · Energy Conservation Program: Energy Conservation Standards for Consumer Furnaces (final rule), 88 FR 87502, December 18, 2023, p70 · IV.F.6 “"DOE estimates the average product lifetime to be 21.5 years for NWGFs and MHGFs"” — U.S. Department of Energy (planning life)
  Printed page 87571. residential: non-weatherized gas furnaces and mobile home gas furnaces; national average. Regional averages 22.5 years (North) and 20.2 years (rest of country) in the same paragraph. Also p.2 (printed 87503).

How sources are chosen and recorded: sourcing policy.

Preventive maintenance

No maintenance tasks are sourced for this component yet.

Open questions

• Every source here is a published planning, design or accounting life. None is observed replacement data.
• No preventive maintenance tasks are sourced yet.

Know the answer? Send it with a source to [email protected].

Cite this

Citation

unfinished.one (2026). Furnace, gas-fired, v0.3.0. https://unfinished.one/c/furnace-gas/v/0.3.0

BibTeX

@misc{unfinished_furnace_gas_0_3_0,
  title = {Furnace, gas-fired},
  author = {{unfinished.one}},
  year = {2026},
  version = {0.3.0},
  url = {https://unfinished.one/c/furnace-gas/v/0.3.0},
  note = {CC BY 4.0}
}

Licence CC BY 4.0 · How to cite · JSON · Versions: 0.3.0, 0.2.0, 0.1.0