{"id":"rtu-heat-pump","version":"0.3.0","classification":{"uniformat":"D3050"},"names":["Rooftop heat pump unit"],"aliases":["heat pump RTU","packaged heat pump"],"service_life":{"median_years":21,"range_years":[15,30],"range_basis":"source_spread"},"pm_tasks":[{"task":"Inspect cabinet, isolators and supports; tighten loose fasteners","frequency":"P4M","reference":"TM 5-692-1 Maintenance of Mechanical and Electrical Equipment at Command, Control, Communications, Computer, Intelligence, Surveillance, and Reconnaissance (C4ISR) Facilities: Recommended Maintenance Practices","url":"https://www.wbdg.org/FFC/ARMYCOE/COETM/tm_5_692_1.pdf","page":117,"checklist":"Table 14-2 Package air conditioning (DX) unit"},{"task":"Check filters; replace as needed","frequency":"P1M","reference":"TM 5-692-1 Maintenance of Mechanical and Electrical Equipment at Command, Control, Communications, Computer, Intelligence, Surveillance, and Reconnaissance (C4ISR) Facilities: Recommended Maintenance Practices","url":"https://www.wbdg.org/FFC/ARMYCOE/COETM/tm_5_692_1.pdf","page":117,"checklist":"Table 14-2 Package air conditioning (DX) unit"},{"task":"Leak-check refrigerant circuit; check charge and oil level","frequency":"P4M","reference":"TM 5-692-1 Maintenance of Mechanical and Electrical Equipment at Command, Control, Communications, Computer, Intelligence, Surveillance, and Reconnaissance (C4ISR) Facilities: Recommended Maintenance Practices","url":"https://www.wbdg.org/FFC/ARMYCOE/COETM/tm_5_692_1.pdf","page":117,"checklist":"Table 14-2 Package air conditioning (DX) unit"},{"task":"Check refrigerant charge and compressor oil level","frequency":"P4M","reference":"TM 5-692-1 Maintenance of Mechanical and Electrical Equipment at Command, Control, Communications, Computer, Intelligence, Surveillance, and Reconnaissance (C4ISR) Facilities: Recommended Maintenance Practices","url":"https://www.wbdg.org/FFC/ARMYCOE/COETM/tm_5_692_1.pdf","page":117,"checklist":"Table 14-2 Package air conditioning (DX) unit"},{"task":"Clean condensate drain pan and drain lines","frequency":"P4M","reference":"TM 5-692-1 Maintenance of Mechanical and Electrical Equipment at Command, Control, Communications, Computer, Intelligence, Surveillance, and Reconnaissance (C4ISR) Facilities: Recommended Maintenance Practices","url":"https://www.wbdg.org/FFC/ARMYCOE/COETM/tm_5_692_1.pdf","page":117,"checklist":"Table 14-2 Package air conditioning (DX) unit"},{"task":"Check fan bearings for heat","frequency":"P4M","reference":"TM 5-692-1 Maintenance of Mechanical and Electrical Equipment at Command, Control, Communications, Computer, Intelligence, Surveillance, and Reconnaissance (C4ISR) Facilities: Recommended Maintenance Practices","url":"https://www.wbdg.org/FFC/ARMYCOE/COETM/tm_5_692_1.pdf","page":117,"checklist":"Table 14-2 Package air conditioning (DX) unit"},{"task":"Check fans for unusual noise or vibration","frequency":"P4M","reference":"TM 5-692-1 Maintenance of Mechanical and Electrical Equipment at Command, Control, Communications, Computer, Intelligence, Surveillance, and Reconnaissance (C4ISR) Facilities: Recommended Maintenance Practices","url":"https://www.wbdg.org/FFC/ARMYCOE/COETM/tm_5_692_1.pdf","page":117,"checklist":"Table 14-2 Package air conditioning (DX) unit"},{"task":"Check and tighten fan fasteners","frequency":"P4M","reference":"TM 5-692-1 Maintenance of Mechanical and Electrical Equipment at Command, Control, Communications, Computer, Intelligence, Surveillance, and Reconnaissance (C4ISR) Facilities: Recommended Maintenance Practices","url":"https://www.wbdg.org/FFC/ARMYCOE/COETM/tm_5_692_1.pdf","page":117,"checklist":"Table 14-2 Package air conditioning (DX) unit"},{"task":"Lubricate fan sleeve bearings","frequency":"P1M","reference":"TM 5-692-1 Maintenance of Mechanical and Electrical Equipment at Command, Control, Communications, Computer, Intelligence, Surveillance, and Reconnaissance (C4ISR) Facilities: Recommended Maintenance Practices","url":"https://www.wbdg.org/FFC/ARMYCOE/COETM/tm_5_692_1.pdf","page":117,"checklist":"Table 14-2 Package air conditioning (DX) unit"},{"task":"Lubricate fan ball bearings","frequency":"P3M","reference":"TM 5-692-1 Maintenance of Mechanical and Electrical Equipment at Command, Control, Communications, Computer, Intelligence, Surveillance, and Reconnaissance (C4ISR) Facilities: Recommended Maintenance Practices","url":"https://www.wbdg.org/FFC/ARMYCOE/COETM/tm_5_692_1.pdf","page":117,"checklist":"Table 14-2 Package air conditioning (DX) unit"},{"task":"Lubricate fan roller bearings","frequency":"P1M","reference":"TM 5-692-1 Maintenance of Mechanical and Electrical Equipment at Command, Control, Communications, Computer, Intelligence, Surveillance, and Reconnaissance (C4ISR) Facilities: Recommended Maintenance Practices","url":"https://www.wbdg.org/FFC/ARMYCOE/COETM/tm_5_692_1.pdf","page":117,"checklist":"Table 14-2 Package air conditioning (DX) unit"},{"task":"Inspect belts and pulleys","frequency":"P4M","reference":"TM 5-692-1 Maintenance of Mechanical and Electrical Equipment at Command, Control, Communications, Computer, Intelligence, Surveillance, and Reconnaissance (C4ISR) Facilities: Recommended Maintenance Practices","url":"https://www.wbdg.org/FFC/ARMYCOE/COETM/tm_5_692_1.pdf","page":117,"checklist":"Table 14-2 Package air conditioning (DX) unit"},{"task":"Measure and adjust belt tension and alignment","frequency":"P4M","reference":"TM 5-692-1 Maintenance of Mechanical and Electrical Equipment at Command, Control, Communications, Computer, Intelligence, Surveillance, and Reconnaissance (C4ISR) Facilities: Recommended Maintenance Practices","url":"https://www.wbdg.org/FFC/ARMYCOE/COETM/tm_5_692_1.pdf","page":117,"checklist":"Table 14-2 Package air conditioning (DX) unit"},{"task":"Clean dirt or scale from fan blades or wheel","frequency":"P4M","reference":"TM 5-692-1 Maintenance of Mechanical and Electrical Equipment at Command, Control, Communications, Computer, Intelligence, Surveillance, and Reconnaissance (C4ISR) Facilities: Recommended Maintenance Practices","url":"https://www.wbdg.org/FFC/ARMYCOE/COETM/tm_5_692_1.pdf","page":117,"checklist":"Table 14-2 Package air conditioning (DX) unit"},{"task":"Inspect fan internals; repair coatings; rebalance if needed","frequency":"P1Y","reference":"TM 5-692-1 Maintenance of Mechanical and Electrical Equipment at Command, Control, Communications, Computer, Intelligence, Surveillance, and Reconnaissance (C4ISR) Facilities: Recommended Maintenance Practices","url":"https://www.wbdg.org/FFC/ARMYCOE/COETM/tm_5_692_1.pdf","page":118,"checklist":"Table 14-2 Package air conditioning (DX) unit"},{"task":"Check damper positions and adjust position switches","frequency":"P4M","reference":"TM 5-692-1 Maintenance of Mechanical and Electrical Equipment at Command, Control, Communications, Computer, Intelligence, Surveillance, and Reconnaissance (C4ISR) Facilities: Recommended Maintenance Practices","url":"https://www.wbdg.org/FFC/ARMYCOE/COETM/tm_5_692_1.pdf","page":118,"checklist":"Table 14-2 Package air conditioning (DX) unit"},{"task":"Exercise dampers for free movement","frequency":"P4M","reference":"TM 5-692-1 Maintenance of Mechanical and Electrical Equipment at Command, Control, Communications, Computer, Intelligence, Surveillance, and Reconnaissance (C4ISR) Facilities: Recommended Maintenance Practices","url":"https://www.wbdg.org/FFC/ARMYCOE/COETM/tm_5_692_1.pdf","page":118,"checklist":"Table 14-2 Package air conditioning (DX) unit"},{"task":"Inspect damper seals","frequency":"P4M","reference":"TM 5-692-1 Maintenance of Mechanical and Electrical Equipment at Command, Control, Communications, Computer, Intelligence, Surveillance, and Reconnaissance (C4ISR) Facilities: Recommended Maintenance Practices","url":"https://www.wbdg.org/FFC/ARMYCOE/COETM/tm_5_692_1.pdf","page":118,"checklist":"Table 14-2 Package air conditioning (DX) unit"},{"task":"Clean damper operator and linkage; oil lightly","frequency":"P4M","reference":"TM 5-692-1 Maintenance of Mechanical and Electrical Equipment at Command, Control, Communications, Computer, Intelligence, Surveillance, and Reconnaissance (C4ISR) Facilities: Recommended Maintenance Practices","url":"https://www.wbdg.org/FFC/ARMYCOE/COETM/tm_5_692_1.pdf","page":118,"checklist":"Table 14-2 Package air conditioning (DX) unit"},{"task":"Clean, inspect and lubricate damper bearings","frequency":"P4M","reference":"TM 5-692-1 Maintenance of Mechanical and Electrical Equipment at Command, Control, Communications, Computer, Intelligence, Surveillance, and Reconnaissance (C4ISR) Facilities: Recommended Maintenance Practices","url":"https://www.wbdg.org/FFC/ARMYCOE/COETM/tm_5_692_1.pdf","page":118,"checklist":"Table 14-2 Package air conditioning (DX) unit"},{"task":"Record compressor head, suction and oil pressures and temperature","frequency":"P4M","reference":"TM 5-692-1 Maintenance of Mechanical and Electrical Equipment at Command, Control, Communications, Computer, Intelligence, Surveillance, and Reconnaissance (C4ISR) Facilities: Recommended Maintenance Practices","url":"https://www.wbdg.org/FFC/ARMYCOE/COETM/tm_5_692_1.pdf","page":118,"checklist":"Table 14-2 Package air conditioning (DX) unit"},{"task":"Record compressor and fan motor amps and volts","frequency":"P4M","reference":"TM 5-692-1 Maintenance of Mechanical and Electrical Equipment at Command, Control, Communications, Computer, Intelligence, Surveillance, and Reconnaissance (C4ISR) Facilities: Recommended Maintenance Practices","url":"https://www.wbdg.org/FFC/ARMYCOE/COETM/tm_5_692_1.pdf","page":118,"checklist":"Table 14-2 Package air conditioning (DX) unit"},{"task":"Clean, inspect and calibrate controls and safety devices","frequency":"P4M","reference":"TM 5-692-1 Maintenance of Mechanical and Electrical Equipment at Command, Control, Communications, Computer, Intelligence, Surveillance, and Reconnaissance (C4ISR) Facilities: Recommended Maintenance Practices","url":"https://www.wbdg.org/FFC/ARMYCOE/COETM/tm_5_692_1.pdf","page":118,"checklist":"Table 14-2 Package air conditioning (DX) unit"}],"basis":[{"type":"public_document","life_type":"planning","title":"CNA e-Tool Estimated Useful Life Table","by":"U.S. Department of Housing and Urban Development","url":"https://www.hud.gov/sites/documents/eul_for_cna_e_tool.pdf","page":12,"code":"HUD CNA 3.4.3.1.1","label":"Electric heat pump, condenser, pad or rooftop","years":15,"note":"Same life for family and elderly properties. US multifamily housing. HUD's row also covers split-system heat pump condensers on a pad."},{"type":"public_document","life_type":"planning","title":"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","by":"U.S. Department of Energy","url":"https://www.govinfo.gov/content/pkg/FR-2022-03-30/pdf/2022-06450.pdf","page":11,"label":"\"the average lifetimes of 19 years for air conditioners and 16.2 years for heat pumps\"","years":16.2,"note":"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."},{"type":"public_document","life_type":"planning","title":"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","by":"U.S. Department of Energy","url":"https://www.govinfo.gov/content/pkg/FR-2024-05-20/pdf/2024-08546.pdf","page":41,"code":"IV.F.6","label":"Equipment Lifetime: \"DOE assumed a mean lifetime of 21 years for small equipment classes\"","years":21,"note":"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)."},{"type":"public_document","life_type":"planning","title":"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","by":"U.S. Department of Energy","url":"https://www.govinfo.gov/content/pkg/FR-2024-05-20/pdf/2024-08546.pdf","page":41,"code":"IV.F.6","label":"Equipment Lifetime: \"a mean lifetime of 23 years for large equipment classes\"","years":23,"note":"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)."},{"type":"public_document","life_type":"planning","title":"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","by":"U.S. Department of Energy","url":"https://www.govinfo.gov/content/pkg/FR-2024-05-20/pdf/2024-08546.pdf","page":41,"code":"IV.F.6","label":"Equipment Lifetime: \"For very large equipment classes, DOE created a new distribution with an assumed mean lifetime of 30 years\"","years":30,"note":"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."}],"confidence":{"grade":"C","sample_size":null},"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."],"contributors":["unfinished.one editors"],"last_reviewed":"2026-10-21","canonical_url":"https://unfinished.one/c/rtu-heat-pump","versioned_url":"https://unfinished.one/c/rtu-heat-pump/v/0.3.0","licence":"CC-BY-4.0","citation":"unfinished.one (2026). Rooftop heat pump unit, v0.3.0. https://unfinished.one/c/rtu-heat-pump/v/0.3.0"}