Uniformat D3050

Rooftop unit, gas heat / DX cooling

Also called RTU, packaged rooftop unit, gas electric RTU, rooftop unit

• 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

• 15 years · CNA e-Tool Estimated Useful Life Table, p13 · HUD CNA 3.4.3.1.11 “Package HVAC roof top” — U.S. Department of Housing and Urban Development (planning life)
  Same life for family and elderly properties. US multifamily housing. HUD's row covers packaged rooftop HVAC units without separating gas heat from heat pumps.
• 19 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 air conditioners <65,000 Btu/h (single-package and split). Small packaged rooftop units fall here; split systems do too. 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

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). Rooftop unit, gas heat / DX cooling, v0.3.0. https://unfinished.one/c/rtu-gas-electric/v/0.3.0

BibTeX

@misc{unfinished_rtu_gas_electric_0_3_0,
  title = {Rooftop unit, gas heat / DX cooling},
  author = {{unfinished.one}},
  year = {2026},
  version = {0.3.0},
  url = {https://unfinished.one/c/rtu-gas-electric/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