Uniformat D3050

Rooftop heat pump unit

Also called heat pump RTU, packaged heat pump

• Confidence C
• Version 0.4.0 (permanent link)
• Reviewed 2026-10-22

This is version 0.4.0. The latest is 0.5.0.

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

• 15 years · CNA e-Tool Estimated Useful Life Table, p12 · HUD CNA 3.4.3.1.1 “Electric heat pump, condenser, pad or rooftop” — U.S. Department of Housing and Urban Development (planning life)
  Same life for family and elderly properties. US multifamily housing. HUD's row also covers split-system heat pump condensers on a pad.
• 15 years · Design standards: employer's requirements – Technical Manual (ER-DFE-XX-XX-T-X-0201, revision A-C01), p238 · 5.4.4 “Air source heat pumps: 15 years” — Department for Education (England) (design life)
  Printed page 238. Air source heat pumps, type not stated; in UK schools these are often air-to-water units for wet heating, so the match to air-to-air splits and rooftop units is loose. Minimum life expectancy (design requirement) for DfE-funded school buildings. Minimum design requirements placed on contractors for school buildings, not observed replacement ages. Section 5.1.4 (sanitaryware) refers to CIBSE Guide M Appendix 12.A1 'in general'.
• 16.2 years · Energy Conservation Program: Energy Conservation Standards for Air Cooled, Three-Phase, Small Commercial Air Conditioners and Heat Pumps With a Cooling Capacity of Less Than 65,000 Btu/h (NOPR), 87 FR 18290, March 30, 2022, p11 · “"the average lifetimes of 19 years for air conditioners and 16.2 years for heat pumps"” — U.S. Department of Energy (planning life)
  Printed page 18300. class: three-phase commercial heat pumps <65,000 Btu/h (single-package and split). Carried over from the September 2020 NODA/RFI. Proposed rule, not final.
• 21 years · Energy Conservation Program: Energy Conservation Standards for Air-Cooled Commercial Package Air Conditioners and Heat Pumps (direct final rule), 89 FR 44052, May 20, 2024, p41 · IV.F.6 “Equipment Lifetime: "DOE assumed a mean lifetime of 21 years for small equipment classes"” — U.S. Department of Energy (planning life)
  Printed page 44092. class: small ACUAC/ACUHP (>=65,000 and <135,000 Btu/h), air conditioners and heat pumps alike. Carried over from the January 2016 DFR (which gave 21.1 years). Also in the LCC inputs summary table, p.39 (printed 44090).
• 23 years · Energy Conservation Program: Energy Conservation Standards for Air-Cooled Commercial Package Air Conditioners and Heat Pumps (direct final rule), 89 FR 44052, May 20, 2024, p41 · IV.F.6 “Equipment Lifetime: "a mean lifetime of 23 years for large equipment classes"” — U.S. Department of Energy (planning life)
  Printed page 44092. class: large ACUAC/ACUHP (>=135,000 and <240,000 Btu/h). Carried over from the January 2016 DFR (which gave 22.6 years).
• 30 years · Energy Conservation Program: Energy Conservation Standards for Air-Cooled Commercial Package Air Conditioners and Heat Pumps (direct final rule), 89 FR 44052, May 20, 2024, p41 · IV.F.6 “Equipment Lifetime: "For very large equipment classes, DOE created a new distribution with an assumed mean lifetime of 30 years"” — U.S. Department of Energy (planning life)
  Printed page 44092. class: very large ACUAC/ACUHP (>=240,000 and <760,000 Btu/h); new in this rule (2016 DFR used 33.7 years). Very large units are less typical rooftop units.

How sources are chosen and recorded: sourcing policy.

Preventive maintenance

23 tasks in 4 work orders. Intervals that fall due together are one visit: the annual visit also covers the monthly, quarterly and every 4 months tasks.

1. 1Monthly
2. 2Monthly
3. 3Qtr
4. 4Every 4 months
5. 5Monthly
6. 6Qtr
7. 7Monthly
8. 8Every 4 months
9. 9Qtr
10. 10Monthly
11. 11Monthly
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.
• Some maintenance intervals come from TM 5-692-1, an Army manual for mission-critical (C4ISR) facilities; they may be tighter than typical commercial practice.

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

Cite this

Citation

unfinished.one (2026). Rooftop heat pump unit, v0.4.0. https://unfinished.one/c/rtu-heat-pump/v/0.4.0

BibTeX

@misc{unfinished_rtu_heat_pump_0_4_0,
  title = {Rooftop heat pump unit},
  author = {{unfinished.one}},
  year = {2026},
  version = {0.4.0},
  url = {https://unfinished.one/c/rtu-heat-pump/v/0.4.0},
  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