How long does a commercial rooftop unit last? ASHRAE service-life data explained

How long does a commercial rooftop unit usually last?

Plan around 15 to 20 years for a commercial rooftop unit, the typical life range reported in DOE's 2017 Advanced RTU Campaign peer review. ASHRAE's public database, checked November 5, 2026, lists 220 packaged rooftop DX units: 215 still operating and five replaced, with a 22-year median age at replacement for those five. Use the DOE range for initial capital planning, then use the unit's condition, maintenance history, runtime and repair options to decide its next inspection and replacement window. [DOE 2017](https://www.energy.gov/sites/prod/files/2017/04/f34/12_22291b_Deru_031417-1510.pdf) [ASHRAE live query, 2026-11-05](https://costdatabase.ashrae.org/system_service_life.asp?selected_system_type=1)

A [rooftop unit](/field-guides/glossary/rooftop-unit/) packages air-conditioning equipment into a roof-mounted assembly. Conventional commercial rooftop direct-expansion, or DX, units are the main database match here. Identify the equipment before borrowing a neighboring category's life figure.

Service ends for several reasons. A major failure can force replacement, but repeated interruptions, unavailable repair support, changed building needs or unfavorable operating economics can also end an otherwise repairable unit's original application. ASHRAE's advisory technical FAQ distinguishes service in that application from mechanical life alone. [ASHRAE advisory FAQ](https://www.ashrae.org/technical-resources/technical-faqs)

A working unit beyond the planning range needs a documented retention decision. A younger unit with extensive deterioration needs a repair and replacement comparison now. Keep the life reference, funded renewal window and next inspection on the same unit record.

What does the ASHRAE rooftop HVAC service-life table show?

Use the packaged rooftop DX row for a conventional packaged RTU. The selected comparison below keeps neighboring equipment classes visible so a reader does not accidentally substitute an air-cooled packaged-unit population or a broad heat-pump population for rooftop evidence. All reported ages are in years. [ASHRAE live query, 2026-11-05](https://costdatabase.ashrae.org/system_service_life.asp?selected_system_type=1)

Keep a rooftop heat pump's model and application label on the assessment. A broad air-to-air heat-pump category does not identify a rooftop-only sample. Split condensers, PTACs, cooling towers and air handlers belong to other equipment comparisons; the [RTU installation and startup guide](/field-guides/hvac/rooftop-unit-rtu-installation-startup/) helps establish what the installed assembly includes.

ASHRAE's rooftop row, accessed November 5, 2026, reports a 16-year median age among units still operating when reported; that is the middle operating age, not the age when half of RTUs retire. An equipment count is not a count of independent buildings, and the query's building header also covers other air-distribution classes. Source publication, equipment installation, observation and page access are different dates. [ASHRAE live query, 2026-11-05](https://costdatabase.ashrae.org/system_service_life.asp?selected_system_type=1)

Source: ASHRAE public Service Life Data Query, Air Distribution, accessed November 5, 2026. Submitted records; national representativeness and a common installation cohort are not established. Operating ages are right-censored lifetime observations. The rooftop replacement median describes five units, not a fitted median for the whole rooftop population. Classes remain separate; n/a means no replacement-age statistic where no replacements were reported.

Why are operating age and retirement age different?

An operating unit's observed age is right-censored: it establishes how long the unit had remained in service when observed, not the age at which it will be retired. This applies NIST's censoring definition and ASHRAE's treatment of equipment still in service. The unit supplies useful evidence even though its completed lifetime is unknown. [NIST censoring reference](https://www.itl.nist.gov/div898/handbook/apr/section1/apr131.htm) [ASHRAE supplement 2021](https://xp20.ashrae.org/SupplementalFiles/PHVAC9/Economic_Analyses_and_LCC.pdf)

A replacement record supplies an endpoint, but replacement and failure are different events. An owner can remove functioning equipment during a building conversion or an economic upgrade. Keep the recorded endpoint as replacement unless the underlying record identifies failure as its cause. [ASHRAE Handbook 2023](https://handbook.ashrae.org/handbooks/A23/SI/A23_Ch38/a23_ch38_si.aspx)

A proper life analysis retains both completed service spells and ages reached by operating equipment. Neither subgroup median alone describes the full population's survival.

Anvilfield estimates the record shares below by dividing each subgroup count by the rooftop total and multiplying by 100. The calculation describes the composition of the submitted records on the stated query date. An annual failure rate would also require exposure time and a failure-defined endpoint; the table provides neither. Individual ages and observation design are needed before fitting a survival curve.

Method: subgroup share = subgroup records / total rooftop records × 100. Anvilfield estimates, calculated November 5, 2026 from ASHRAE's published rooftop counts; percentages rounded to two decimals.

Why do ASHRAE references say 15, 22 or more than 24 years?

The figures describe a historical median estimate, a replacement-subgroup median and a survival-analysis result. Preserve the equipment scope and source date beside each number.

ASHRAE's 2021 Principles of HVAC supplement traces the familiar 15-year rooftop estimate to a 1976 survey reported in 1978, while its greater-than-24-year survival result covers a broader DX air-distribution sample of 1,907 units. That broader sample includes 284 replacements. The supplement describes the 2005 database seed as 163 commercial office buildings and reports insufficient updated data for the separately named rooftop categories. [ASHRAE supplement 2021](https://xp20.ashrae.org/SupplementalFiles/PHVAC9/Economic_Analyses_and_LCC.pdf)

The greater-than sign matters. ASHRAE's 2021 supplement reports greater than 24 years for broad DX equipment using a survival curve that remains at or above 50% with at least 30 units represented at the reported age. The result is a lower bound, not an exact 24-year retirement median. That age-specific sample qualification is not a requirement for 30 replacement events or a universal sample-size rule. [ASHRAE supplement 2021](https://xp20.ashrae.org/SupplementalFiles/PHVAC9/Economic_Analyses_and_LCC.pdf)

The 2023 HVAC Applications Handbook, chapter 38, tables 3 and 4, retains the broad DX result and historical rooftop comparison. The 2021 supplement reproduces the 2019 chapter. A newer publication date does not refresh the underlying observations, and neither summary supplies a condition-adjusted remaining-life distribution for the unit on your roof. [ASHRAE Handbook 2023](https://handbook.ashrae.org/handbooks/A23/SI/A23_Ch38/a23_ch38_si.aspx)

Source history: 1976 survey reported in 1978; 2005 research summarized by ASHRAE in its 2021 supplement and 2023 Handbook. Live query accessed November 5, 2026. Original comparison of selected facts; equipment populations are not pooled.

Can you subtract RTU age to get remaining useful life?

Subtracting age from a planning endpoint gives time to that budget endpoint. Write “planning time remaining” on the worksheet. A calendar subtraction cannot account for an untested heat exchanger, deteriorated coil or unavailable compressor, so the condition assessment must determine whether retention remains acceptable. Even a fitted population median is not an individual expiration date: a unit that has already survived to its present age needs a remaining-life assessment conditional on that survival and its current condition.

Start the clock from documented service entry. Keep manufacturing date, installation date, first operation and inspection date in separate fields. A unit stored before installation has a manufacturing age different from its service age; roof age and building age are not substitutes. The [startup record](/field-guides/hvac/rooftop-unit-rtu-installation-startup/) is the place to recover the commissioning date and original performance baseline.

When installation is undocumented, the latest record showing the previous unit sets the earliest possible service entry; the first record showing the current unit sets the latest. Record that interval and its supporting documents. If only the manufacturing date is known, label it manufacturing age and leave service entry unknown. Continue the condition survey and funding decision using the available evidence.

A new compressor starts a new component history. The cabinet, coils, heating section, wiring and controls retain their own ages and findings. Record the component replacement and its cause, then assess the complete assembly using the component distinctions in DOE's field workbook and the applicable service manual. [DOE field workbook, undated](https://betterbuildingssolutioncenter.energy.gov/sites/default/files/tools/Copy%20of%20arc_rtu_field_evaluation_checklist.xlsx) [Carrier 05/14](https://www.shareddocs.com/hvac/docs/1009/Public/0F/48TC-4-16-01SM.pdf)

ASHRAE's 2023 HVAC Applications Handbook, chapter 38, treats the financial study period as a selected analysis horizon; it is not the equipment's service-life estimate. Warranty coverage is another separate question, answered by the unit's warranty terms, covered assemblies and exclusions. Physical operability, economic retention and contractual coverage need separate fields. [ASHRAE Handbook 2023](https://handbook.ashrae.org/handbooks/A23/SI/A23_Ch38/a23_ch38_si.aspx)

For a unit already older than the range, record current age, condition and the next decision date. Test retention against parts support, capacity requirements and tolerated downtime; identify the funding needed if findings change.

Which unit conditions change the planning window?

Condition changes the action through a specific diagnosis. Dirty coils require cleaning and verification; coil material loss requires a repairability decision. A disconnected damper actuator requires restoration and a functional check. DOE's field workbook explicitly permits condition ratings to change after successful corrective service. [DOE field workbook, undated](https://betterbuildingssolutioncenter.energy.gov/sites/default/files/tools/Copy%20of%20arc_rtu_field_evaluation_checklist.xlsx)

Separate fan hours, compressor hours, heating hours and calendar age. A continuous fan schedule does not establish continuous compressor operation, and a schedule is not an observed runtime counter. Record BAS trend dates, counter-reset dates, starts and hours where available; use the evidence to diagnose duty and cycling rather than convert hours into invented years of life. [DOE evaluation methodology, 2020](https://betterbuildingssolutioncenter.energy.gov/advanced-rtu-evaluation-methodology) [Trane January 2017](https://www.trane.com/content/dam/Trane/Commercial/global/products-systems/equipment/unitary/rooftop-systems/precedent-3-to-5-tons-eflex/RT-SVU03L-EN_01132017.pdf)

Exposure and duty explain why equal-age units deserve different actions. ASHRAE's 2023 Handbook identifies marine salt and industrial contaminants as corrosion influences; inspect coil material, cabinet supports and prior repairs rather than subtracting a standard number of years. Long cooling seasons, year-round ventilation and heavy heating duty belong in separate operating-history fields, because each loads different assemblies. [ASHRAE Handbook 2023](https://handbook.ashrae.org/handbooks/A23/SI/A23_Ch38/a23_ch38_si.aspx)

For controls problems, record commanded and actual damper positions and post-repair operation using the [economizer and demand-control ventilation guide](/field-guides/hvac/economizer-demand-control-ventilation/). For airflow problems, retain measured results and test conditions in an [air-balancing report](/field-guides/hvac/air-balancing-report-procedure/). A symptom such as poor cooling needs a cause before it becomes a replacement recommendation.

Consequence is a separate input. A building with no cooling backup and little outage tolerance needs earlier procurement readiness than one able to absorb an interruption. Anvilfield's planning rule is to set the next action by the shortest consequential constraint: equipment condition, service support or the owner's operating requirement. Use the [portfolio survey-ranking guide](/field-guides/hvac/rank-rtu-repair-replacement-prospects/) to order visits across units.

ASHRAE's 2023 Handbook discusses maintenance and corrosive exposure as life influences. These sources supply no fixed RTU life-extension credit for maintenance or universal years-to-subtract rule for coastal exposure.

How often should an aging rooftop unit be inspected?

Follow a schedule for the installed model and the task being performed. Carrier's May 2014 48TC**04-16 instructions start with monthly routine checks until an installation-specific schedule is identified, alongside quarterly inspections, post-startup checks and seasonal work. A quarterly appointment alone does not describe that maintenance program. [Carrier 05/14](https://www.shareddocs.com/hvac/docs/1009/Public/0F/48TC-4-16-01SM.pdf)

Trane's January 2017 RT-SVU03L-EN manual calls for air-filter inspection at least monthly during constant operation. Filter inspection and a full equipment inspection are different tasks; neither should silently replace the other in a service agreement. [Trane January 2017](https://www.trane.com/content/dam/Trane/Commercial/global/products-systems/equipment/unitary/rooftop-systems/precedent-3-to-5-tons-eflex/RT-SVU03L-EN_01132017.pdf)

ANSI/ASHRAE/ACCA Standard 180-2018 addresses the maintenance program. Its October 3, 2023 erratum identifies section 5 baseline task frequencies as minimums for compliance and directs revisions to section 4.6. The standard is voluntary unless made mandatory by an applicable jurisdiction; a contract can also require its use. Apply the relevant task requirements through the [preventive-maintenance program](/field-guides/hvac/hvac-preventive-maintenance-program/), with capital reviews kept on a separate calendar. [ASHRAE/ACCA 180-2018](https://www.ashrae.org/File%20Library/Technical%20Resources/Bookstore/previews_2016639_pre.pdf) [ASHRAE erratum 2023](https://www.ashrae.org/file%20library/technical%20resources/standards%20and%20guidelines/standards%20errata/standards/180-2018errata-10-3-2023-.pdf)

Cleaning terminology needs the same care. DOE's workbook distinguishes hot-water power washing from force-based pressure washing and advises against pressure washing because it can remove fins. Carrier's May 2014 instructions prohibit high-velocity water or air and describe a low-velocity rinse. Both address damage from jet force; apply the installed model's water, chemical and cleaning instructions. [DOE field workbook, undated](https://betterbuildingssolutioncenter.energy.gov/sites/default/files/tools/Copy%20of%20arc_rtu_field_evaluation_checklist.xlsx) [Carrier 05/14](https://www.shareddocs.com/hvac/docs/1009/Public/0F/48TC-4-16-01SM.pdf)

Coil construction controls cleaning chemistry. Carrier's May 2014 manual authorizes clean potable water only for its aluminum Novation microchannel condenser and prohibits the named cleaner used in its round-tube/plate-fin procedure. Identify the installed coil before applying a cleaning specification; the same model family can contain different coil constructions. [Carrier 05/14, pp. 10-12](https://www.shareddocs.com/hvac/docs/1009/Public/0F/48TC-4-16-01SM.pdf)

Carrier and Trane intervals apply to the named models and tasks. Standard 180-2018's public preview establishes program scope, and the October 2023 erratum confirms its frequency-revision reference. A condition survey and a capital review remain separate from scheduled maintenance.

At what age should a packaged RTU be replaced?

Use age to select the depth of evaluation, then make the replacement decision from condition, suitability and economics. DOE's campaign decision tree sends older fair/good units into field evaluation and replacement analysis; its poor-general-condition branch leads through project planning to replacement specification. The diagram's age and size thresholds select screening paths, not compulsory retirement dates. [DOE campaign decision tree](https://www1.eere.energy.gov/buildings/commercial/pdfs/arc_rtu_decision_tree.pdf)

A component-level poor rating needs a diagnosis and a defined action. A recoverable controls fault differs from extensive coil deterioration or a diagnosed major assembly problem with unacceptable repair support. Define the correction, verify the resulting condition and price the remaining work before treating a single fault as whole-unit retirement. [DOE field workbook, undated](https://betterbuildingssolutioncenter.energy.gov/sites/default/files/tools/Copy%20of%20arc_rtu_field_evaluation_checklist.xlsx)

The tree uses strict under/over labels at 10 years and 7 tons. Anvilfield routes exact-boundary cases to further analysis, consistent with DOE's methodology, because the diagram does not assign equality. Read this as historical campaign screening guidance, with the landing page dated 2016. [DOE evaluation methodology, 2020](https://betterbuildingssolutioncenter.energy.gov/advanced-rtu-evaluation-methodology) [DOE campaign decision tree](https://www1.eere.energy.gov/buildings/commercial/pdfs/arc_rtu_decision_tree.pdf)

Capacity and project fit also matter. Confirm present load and ventilation needs after correcting faults, and coordinate [rooftop supports and access](/field-guides/roofing/rooftop-equipment-support-walkway/) with planned roof work. Replacing during a roof project can be a scheduling decision without establishing that the equipment has physically failed.

EPA's technician FAQ, checked November 5, 2026, allows existing R-22 equipment to be serviced, including failed-component replacement, and states that continued use is not banned. EPA's HFC phasedown FAQ likewise allows use and repair of existing higher-GWP equipment through its useful life. These policies impose no blanket retirement date on an operating R-22 or R-410A RTU. [EPA R-22 FAQ, 2026-11-05](https://www.epa.gov/ods-phaseout/technicians-and-contractors-frequent-questions) [EPA HFC FAQ, 2026-11-05](https://www.epa.gov/hfcs/frequent-questions-phasedown-hydrofluorocarbons)

Record refrigerant, leak location and dated repair-support information in the scope. New-equipment selection is a separate regulatory task; use the [refrigerant transition guide](/field-guides/hvac/refrigerant-types-a2l-transition/) when specifying that work. Refrigerant availability can change the economic choice without changing the service-life statistic.

Source: undated DOE/NREL Advanced RTU Campaign decision-tree PDF; DOE landing page dated January 7, 2016. Exact-boundary routing and beyond-range retention review are Anvilfield application rules, not additional DOE thresholds.

Worked example: a 13-year-old RTU and its next inspection

The worked unit is a 10-ton packaged DX gas/electric RTU in the Carrier 48TC**12 family, with belt drive and applicable May 2014 service instructions. Its service start is November 5, 2013, and its review date is November 5, 2026. The worksheet below states the Anvilfield case inputs, including condition, maintenance-scheduling status and duty.

Subtract documented service age from each selected total-life planning endpoint, then add the resulting intervals to the review date. Anvilfield estimates a 2 to 7-year renewal-budget horizon for this 13-year-old unit using DOE's 2017 range of 15 to 20 years. The resulting budget window runs from November 2028 through November 2033. [DOE 2017](https://www.energy.gov/sites/prod/files/2017/04/f34/12_22291b_Deru_031417-1510.pdf)

The decision is to retain under the stated condition inputs and fund renewal planning. Because the installation-specific task schedule is being reestablished, book the monthly routine check for December 5, 2026 and the separate quarterly inspection for February 5, 2027 under Carrier's instructions. Keep seasonal work on its actual due date. [Carrier 05/14](https://www.shareddocs.com/hvac/docs/1009/Public/0F/48TC-4-16-01SM.pdf)

Anvilfield estimates 3,120 scheduled fan hours per year by multiplying 12 hours per day by five days per week and 52 weeks. Keep scheduled hours beside actual fan and compressor runtime counters so the review shows both intended and actual duty.

Worsening coil material loss, a confirmed heating defect, recurring unresolved faults or unacceptable parts support brings forward a scoped repair or replacement decision. Record any changed finding with its assigned action and due date.

Method: planning interval = selected planning life minus service age. Anvilfield estimates use the stated installation date, condition inputs and DOE 2017 endpoints. Carrier 05/14 sets the monthly and quarterly task timing; the November 5, 2027 capital review is Anvilfield's annual review choice.

What costs belong in the replacement decision?

Obtain two complete scopes: a technically acceptable repair and a replacement meeting current loads and operating requirements. Include equipment, labor, refrigerant work, crane and access, curb and roof work, electrical connections, controls, permits and design, disposal, commissioning and temporary service where required. Compare scopes that deliver the same required service. [DOE evaluation methodology, 2020](https://betterbuildingssolutioncenter.energy.gov/advanced-rtu-evaluation-methodology)

Use one financial study period for energy, planned maintenance, future repair assumptions, downtime and residual value. PNNL's RTU Comparison Calculator description includes local climate, part-load performance and building-use patterns in energy and life-cycle cost screening. Its chosen product life is an economic input rather than a predicted failure date. [PNNL RTU calculator description](https://www.pnnl.gov/rooftop-unit-comparison-calculator)

A repair percentage alone misses the consequence of repeated downtime and the scope outside the equipment purchase. Use the [repair/replacement ranking guide](/field-guides/hvac/rank-rtu-repair-replacement-prospects/) for the fuller comparison and [maintenance-agreement pricing guide](/field-guides/hvac/price-commercial-rtu-maintenance-agreement/) to cost actual task scope. Retain dated quotes so the next review can identify what changed.

Work backward from the owner's latest acceptable outage date. Obtain supplier lead times, then place engineering, permits, roof coordination, crane availability and startup ahead of that date. The service provider owns the condition findings; the owner or facility manager owns outage tolerance and funding; the project designer resolves changed loads or system selection where needed.

For reserve planning, subtract the amount already reserved from the complete renewal allowance, then divide the balance by the years to the chosen funding date. Set the contribution using the owner's escalation and investment assumptions, and update it whenever a condition finding advances the replacement date.

RTU life-assessment field checklist

Keep one dated record per unit, with observations, reported history, calculations and unknowns identified separately. A visual inspection cannot fill an unperformed heating or refrigeration test with a passing result. Attach the actual readings, test conditions and model-specific procedure to each material diagnosis. [DOE evaluation methodology, 2020](https://betterbuildingssolutioncenter.energy.gov/advanced-rtu-evaluation-methodology) [DOE field workbook, undated](https://betterbuildingssolutioncenter.energy.gov/sites/default/files/tools/Copy%20of%20arc_rtu_field_evaluation_checklist.xlsx)

Preserve the earlier record when updating the recommendation. The change from “retain” to “replace” should be traceable to a new finding, an altered operating requirement or a revised cost comparison. The checklist closes with an assigned action and its trigger so the report becomes scheduled work.

How do you build a renewal-survey program?

Begin established accounts with the unit register and service history. Group equipment needing condition evidence or a funding decision into a renewal-survey program, then use the portfolio-ranking guide to order the visits. Carry the findings into the [maintenance-agreement renewal discussion](/field-guides/hvac/hvac-service-maintenance-agreement/) with a defined survey scope and dated deliverables.

Select buildings for a renewal-survey route by the equipment concentration and service territory. Service teams building a renewal-survey route use PorchRocket's Ground Control to find commercial buildings with two or five-plus visible rooftop units, filtered by building size and business type.

Use installation records and the field checklist to set each listed unit's survey scope; visible unit counts establish equipment concentration, while service records establish age and maintenance history.

Manufacturer and distributor teams can carry the verified register into the [RTU replacement pipeline guide](/field-guides/market-intelligence/hvac-equipment-oems-the-rooftop-unit-replacement-pipeline/). Readers planning across the installed population can use the [US commercial RTU stock estimate](/field-guides/market-intelligence/how-many-rooftop-units-are-in-us-commercial-buildings-estimate/).

Sources, method and how to cite this page

Sources checked November 5, 2026. DOE 2017 supplies the practical planning range; the named ASHRAE editions supply historical comparisons and survival interpretation; the live query supplies a separately dated snapshot. Anvilfield estimates cover record shares, the worked budget window and scheduled hours, with inputs and methods beside each result.

When citing the equipment table, retain its equipment class, subgroup, access date and censoring note. Link to the [equipment table](/field-guides/hvac/commercial-rtu-service-life-ashrae-table/#ashrae-rtu-life-table) and cite the original ASHRAE query alongside the interpretation. A replacement-subgroup value needs its subgroup description wherever it is reused.

Update log: November 5, 2026: article reviewed against primary sources; clarified survival limits, uncertain installation dates and coil-specific cleaning; verified maintenance and refrigerant guidance.

[ASHRAE Service Life Data Query, Air Distribution](https://costdatabase.ashrae.org/system_service_life.asp?selected_system_type=1). Live query, accessed November 5, 2026.

[ASHRAE service-life overview](https://costdatabase.ashrae.org/service_life.asp). Overview, accessed November 5, 2026.

[DOE Advanced RTU Campaign peer review](https://www.energy.gov/sites/prod/files/2017/04/f34/12_22291b_Deru_031417-1510.pdf). 2017 BTO Peer Review, slide 3.

[ASHRAE Handbook, Owning and Operating Costs](https://handbook.ashrae.org/handbooks/A23/SI/A23_Ch38/a23_ch38_si.aspx). 2023 HVAC Applications, chapter 38, tables 3-4.

[ASHRAE Principles of HVAC supplement: Economic Analyses and Life-Cycle Costs](https://xp20.ashrae.org/SupplementalFiles/PHVAC9/Economic_Analyses_and_LCC.pdf). Ninth edition, 2021, section 3, pp. 3-5.

[NIST/SEMATECH e-Handbook: Censoring](https://www.itl.nist.gov/div898/handbook/apr/section1/apr131.htm). Section 8.1.3.1, undated.

[DOE Advanced RTU Evaluation Methodology](https://betterbuildingssolutioncenter.energy.gov/advanced-rtu-evaluation-methodology). Published October 30, 2020.

[DOE/NREL RTU Field Evaluation Checklist](https://betterbuildingssolutioncenter.energy.gov/sites/default/files/tools/Copy%20of%20arc_rtu_field_evaluation_checklist.xlsx). Undated workbook, component and methodology sheets.

[Carrier 48TC Service and Maintenance Instructions](https://www.shareddocs.com/hvac/docs/1009/Public/0F/48TC-4-16-01SM.pdf). 48TC**04-16; 48TC-4-16-01SM, 05/14, pp. 2-3, 5-6, 10-12.

[Trane Precedent gas/electric owner manual](https://www.trane.com/content/dam/Trane/Commercial/global/products-systems/equipment/unitary/rooftop-systems/precedent-3-to-5-tons-eflex/RT-SVU03L-EN_01132017.pdf). 3-10 tons; RT-SVU03L-EN, January 2017, Air Filters.

[PNNL Rooftop Unit Comparison Calculator](https://www.pnnl.gov/rooftop-unit-comparison-calculator). Undated public tool description.

[ASHRAE/ACCA Standard 180-2018 public preview](https://www.ashrae.org/File%20Library/Technical%20Resources/Bookstore/previews_2016639_pre.pdf). 2018 edition, program requirements and tables 5-1/5-2.

[ASHRAE Standard 180-2018 erratum](https://www.ashrae.org/file%20library/technical%20resources/standards%20and%20guidelines/standards%20errata/standards/180-2018errata-10-3-2023-.pdf). October 3, 2023, section 4.3.2.2.

[DOE/NREL Advanced RTU Campaign decision-tree PDF](https://www1.eere.energy.gov/buildings/commercial/pdfs/arc_rtu_decision_tree.pdf). Undated PDF; DOE landing page dated January 7, 2016.

[EPA Technicians and Contractors: Frequent Questions](https://www.epa.gov/ods-phaseout/technicians-and-contractors-frequent-questions). Existing HCFC-22 service questions; accessed November 5, 2026.

[EPA Frequent Questions on the Phasedown of Hydrofluorocarbons](https://www.epa.gov/hfcs/frequent-questions-phasedown-hydrofluorocarbons). Continued-use and repair questions; accessed November 5, 2026.

[ASHRAE Technical FAQs](https://www.ashrae.org/technical-resources/technical-faqs). Advisory service-life and maintenance answers; accessed November 5, 2026.

How to cite this page: Anvilfield, How long does a commercial rooftop unit last? ASHRAE service-life data explained, 2026, https://anvilfield.com/field-guides/hvac/commercial-rtu-service-life-ashrae-table/

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