Uniformat D3030

Split system condensing unit

A split system condensing unit lasts about 18.1 years, the median of 2 published sources, which state 15–21.2 years.

Also listed as Condensing unit, split system, CU, condensing unit, split AC outdoor unit

• Confidence C
• Version 0.5.0 (permanent link)
• Reviewed 2026-10-22

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.

Work out when yours is due for replacement

Basis

• 15 years · CNA e-Tool Estimated Useful Life Table, p12 · HUD CNA 3.4.3.1.2 “Electric AC condenser, pad or rooftop” — U.S. Department of Housing and Urban Development (planning life)
  Same life for family and elderly properties. US multifamily housing.
• 21.2 years · Energy Conservation Program: Energy Conservation Standards for Residential Central Air Conditioners and Heat Pumps (direct final rule), 82 FR 1786, January 6, 2017, p34 · Table IV-16 “TABLE IV–16—AVERAGE LIFETIME BY REGION: Central Air Conditioners, National 21.2 (North 24.1, Hot-humid 18.0, Hot-dry 24.9)” — U.S. Department of Energy (planning life)
  Printed page 1819. Residential central air conditioners (<65,000 Btu/h), product class group covering split-system and single-package units; mapped to condensing-unit because split-system ACs (outdoor condensing unit + indoor coil) are the bulk of the class and Table V-2 (p.47, printed 1832) gives the same regional lifetimes for split-system central air conditioners. Value is for the whole split system, not the outdoor unit alone. National value used; regional range 18.0 (hot-humid) to 24.9 (hot-dry). Commercial split condensing units >=65,000 Btu/h not covered.

How sources are chosen and recorded: sourcing policy.

Preventive maintenance

12 tasks in 1 work order.

1. 1
2. 2
3. 3
4. 4
5. 5
6. 6
7. 7
8. 8
9. 9
10. 10
11. 11
12. 12Annual

Months from the schedule start. Download the tasks as CSV for a CMMS, or ask the MCP tool get_pm_schedule for dated visits.

Frequencies are ISO 8601 durations in the data (P3M = every 3 months).

Open questions

• Every source here is a published planning, design or accounting life. None is observed replacement data.
• Written for GSA contracted O&M in US federal buildings; job plans are generic and defer to manufacturer instructions, and the fire extinguisher plans only point to NFPA 10.

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

Cite this

Citation

unfinished.one (2026). Condensing unit, split system, v0.5.0. https://unfinished.one/c/condensing-unit/v/0.5.0

BibTeX

@misc{unfinished_condensing_unit_0_5_0,
  title = {Condensing unit, split system},
  author = {{unfinished.one}},
  year = {2026},
  version = {0.5.0},
  url = {https://unfinished.one/c/condensing-unit/v/0.5.0},
  note = {CC BY 4.0}
}

Licence CC BY 4.0 · How to cite · JSON · Versions: 0.5.0, 0.4.0, 0.3.0, 0.2.0, 0.1.0