High-performing commercial facilities treat operations and maintenance (O&M) as a continuous management system, not a sequence of emergency repairs. They set balanced goals, measure how the building actually runs, align schedules and controls with occupancy, prevent failures, find hidden losses, document changes, recommission systems when conditions shift, and protect indoor environmental quality (IEQ) throughout. The right priority depends on the building’s systems, climate, use, occupancy pattern, staffing and regulatory obligations.
The nine practices below synthesize guidance from the U.S. Department of Energy (DOE), ENERGY STAR and ASHRAE. They are a practical operating framework, not a universal ranking or a promise of a particular percentage saving.
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Why disciplined O&M matters
O&M supports reliability, safety, equipment life, energy and water efficiency, and occupant comfort. DOE describes effective O&M as an operational discipline that keeps facilities performing as intended, rather than work performed only after something breaks. See the DOE Federal Energy Management Program overview of operations and maintenance.
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An efficient chiller, air-handler or lighting system still wastes resources if it runs while spaces are empty, operates with incorrect setpoints, or is overridden indefinitely. Conversely, aggressive energy reduction can create poor ventilation, uncomfortable temperatures, moisture problems or safety risks. ASHRAE identifies reliability, availability, water use, comfort, safety, health and IEQ as performance dimensions that belong alongside energy and cost; its operations and maintenance handbook chapter provides the broader context.
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Use the practices as a connected loop: establish outcomes, assess present conditions, correct operation, verify results, and revisit the plan as the building changes.
1. Set balanced operating goals
Write goals that reflect the facility’s mission instead of treating the utility bill as the only score. A warehouse, hospital, school, laboratory and office have different risk tolerances and operating profiles. At minimum, define targets or guardrails for:
- Energy use and cost, with the billing period and weather or occupancy context recorded.
- Water consumption and major process or irrigation uses.
- Reliability, availability and acceptable downtime for critical equipment.
- Occupant temperature, humidity, lighting and acoustic comfort.
- Ventilation, filtration and other IEQ indicators.
- Safety, regulatory compliance and response time for faults.
ASHRAE’s 2024 energy-efficiency position document emphasizes energy goals, monitoring, stakeholder engagement and preservation of IEQ. In practice, involve owners, facility staff, tenants, security, cleaning teams and safety personnel before setting targets. A goal such as “reduce run hours” needs a condition: preserve required ventilation and never disable a safety sequence to hit a number.
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Start with evidence. Review the maintenance program, equipment inventory, control drawings, sequences of operation, schedules, alarms, trend logs, utility bills and recent complaints. Walk the building during occupied and unoccupied periods to compare commanded states with actual conditions.
ENERGY STAR’s commercial O&M best-practices guidance describes a rigorous tune-up as an assessment followed by implementation, documentation and tracking. The assessment can include spot measurements of pressure, temperature, power, flow and lighting use over time. Measurements should be taken with calibrated instruments or by qualified staff, and the method and time should be recorded.
A practical baseline review
- Collect operating records. Export at least several billing periods of energy and water data, plus trend data available from the building automation system (BAS).
- Map critical systems. Identify equipment serving critical loads, redundancy, normal operating ranges and safety interlocks.
- Observe conditions. Compare occupied, setup, setback and shutdown states in representative zones.
- List discrepancies. Separate confirmed faults from questions requiring measurement; assign an owner and due date to each item.
- Rank interventions. Consider lifecycle and operating cost, reliability and downtime exposure, comfort and IEQ, staff workload, compatibility with existing systems and ease of documenting results.
Do not alter a sequence simply because a screen value looks unusual. Verify sensors, occupancy, dampers, valves and actual plant conditions first.
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3. Match run times to real occupancy and use
Review HVAC and lighting schedules against how spaces are actually occupied. Check startup, shutdown, warm-up, cool-down, holiday calendars, zone schedules, equipment sequencing, setbacks and manual overrides. An efficient unit consumes unnecessary energy when it starts hours before people arrive or remains enabled after the last shift.
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ENERGY STAR recommends operating equipment only when needed and periodically checking time-of-day schedules and related control parameters. Compare BAS schedules with access-control or booking data where permitted, and interview occupants about recurring early starts, late work or intermittently used areas. Keep critical ventilation, freeze protection, laboratory exhaust and life-safety requirements separate from convenience schedules.
How to tell whether an HVAC schedule is wrong
- Trend zone temperature, supply-air temperature, fan status and occupancy for several representative days.
- Look for equipment running during known vacancies, repeated manual overrides or simultaneous heating and cooling.
- Check whether morning warm-up or cool-down ends when zones reach their limits rather than at a fixed unnecessarily early time.
- Verify that holidays, seasonal calendars and daylight-saving changes are current.
- Ask occupants whether comfort complaints cluster at startup, shutdown or schedule transitions.
Change one schedule or sequence at a time when possible, then trend the result and check comfort and alarms before making a wider change.
4. Tune and use existing controls
Controls can deliver savings without replacing major equipment, but only when the strategy fits the system and safe operating limits. ENERGY STAR lists optimal start/stop, economizer operation, water-temperature resets, night setbacks, morning warm-up and lighting sweeps among potential tune-up strategies.
For each strategy, document the enabling conditions, limits and override path. An economizer requires suitable outdoor conditions, functioning dampers and sensors, and protection against excessive humidity or freezing. A chilled-water reset must respect coil performance, humidity control and equipment minimums. A night setback may be unsuitable for processes, collections, healthcare areas or spaces with moisture-sensitive contents.
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- Confirm sensor calibration, location and signal plausibility before adjusting setpoints.
- Check that valves, dampers and variable-speed drives respond to commands and reach their intended positions.
- Remove obsolete overrides and record who is authorized to apply temporary ones.
- Use deadbands and sequencing that prevent simultaneous heating and cooling where the design permits.
- Set alarm thresholds that identify actionable faults without creating alarm fatigue.
- Provide operators with a plain-language sequence and a safe manual fallback.
Never defeat a fire, smoke, pressure, temperature or other protective interlock to improve an efficiency trend.
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5. Make preventive maintenance operational, not just component-focused
A filter change, lubrication task or belt inspection is necessary but not sufficient. Include operational checks in recurring maintenance: schedules, setpoints, sensor readings, control responses, valve and damper positions, staging, alarms and evidence of simultaneous heating and cooling.
ENERGY STAR warns that equipment can be well maintained yet waste energy or fail early when it is poorly operated. A preventive-maintenance work order should therefore capture the observed operating condition, not merely a completed checkbox. Record readings, parts replaced, defects deferred, temporary workarounds and the person who approved return to service.
What a useful maintenance program contains
- An asset register with location, service, capacity, criticality, manufacturer data and isolation requirements.
- Time- or condition-based tasks with frequencies adjusted to duty cycle, environment and failure history.
- Functional tests for controls, safeties, alarms, pumps, fans, dampers and valves.
- Clear escalation rules for defects affecting safety, IEQ, production or redundancy.
- Training and authorization requirements for staff and contractors.
- Close-out notes that make the next inspection easier and preserve institutional knowledge.
6. Find leaks, damage and after-hours waste
DOE identifies steam, water and air leaks, uninsulated lines, and maladjusted or inoperable controls as common loss sources. ENERGY STAR suggests a nighttime audit and visual insulation inspection. These low-cost checks often reveal waste that utility dashboards cannot localize.
Night and walk-through checks
- Walk representative floors after normal closing and note lights, fans, pumps, compressors and process loads that should be off or in setback.
- Compare observed equipment status with BAS commands and approved after-hours activities.
- Inspect mechanical rooms, roofs, ceilings and service corridors for wet insulation, damaged jacketing, condensate, unusual heat, noise or vibration.
- Listen for compressed-air leaks and inspect steam traps, valves and fittings where safe access is available.
- Check faucets, toilets, cooling-tower makeup, irrigation and other water users for continuous flow.
- Tag each finding with location, probable cause, risk, temporary control and permanent correction.
Use lockout/tagout, confined-space rules, hot-work controls and other site safety procedures. A visual inspection is not permission to open pressurized or energized equipment.
7. Monitor and document performance
Measurement turns isolated fixes into a managed program. Establish a small set of repeatable indicators tied to the goals in practice one. Useful examples include energy and water use per floor area or operating unit, peak demand, equipment run hours, comfort complaints, alarm counts, failed starts, response time, preventive-maintenance completion and unplanned downtime.
DOE identifies energy management information systems as a resource for facility goals. A BAS, utility portal, calibrated portable instrument or data logger may all be appropriate; the tool must match the question. A portable temperature and humidity logger can reveal drift over time, but its range, accuracy, logging interval, calibration and placement should be checked for the task. Do not treat a short spot reading as a whole-building result.
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Document every operational change
- Date, location, equipment and person making the change.
- Original and new setpoints, schedules or sequence logic.
- Reason for the change and expected effect.
- Baseline period, measurement method and relevant occupancy or weather conditions.
- Observed energy, reliability, comfort and IEQ outcomes.
- Review date and rollback plan if the result is unsafe or ineffective.
Trend data should be reviewed by someone who can distinguish a real fault from a sensor, communications or data-quality problem.
8. Commission systems again as needs and conditions change
Buildings drift. Tenants move, hours change, partitions are added, equipment is replaced, sensors fail and control logic is edited by different contractors. DOE identifies retrocommissioning, recommissioning and ongoing commissioning as established approaches for bringing operation back into alignment with current needs.
Recommissioning is warranted after a major occupancy change, renovation, control-system upgrade, persistent comfort complaints, unexplained utility increase or repeated equipment failure. Ongoing commissioning uses regular trend review and corrective action rather than waiting for a major trigger.
A focused recommissioning sequence
- Define current owner, occupant, safety and performance requirements.
- Update the equipment list, drawings, sequences and points list.
- Test sensors, actuators, safeties, schedules, staging and alarm paths.
- Compare actual operation with the documented sequence in occupied and unoccupied modes.
- Correct defects, verify each correction and train operators on the final sequence.
- Set a follow-up review so drift is detected after the project team leaves.
Keep the final sequence of operation and control strategy where the operating team can access them. Undocumented “tribal knowledge” is a reliability risk.
9. Protect indoor conditions while improving efficiency
Efficiency work succeeds only when people can safely and comfortably use the building. Evaluate ventilation, temperature, humidity, filtration, lighting, acoustics, odors and pollutant sources alongside energy. DOE’s discussion of O&M challenges and solutions states that successful building performance requires balancing IEQ and energy.
Investigate comfort or air-quality complaints as potential system signals, not nuisances. Check outdoor-air delivery, schedules, pressure relationships, filter condition, sensor accuracy, dampers, coil cleanliness and local loads. A lower fan speed or tighter setback may save energy but reduce ventilation or cause humidity problems in some systems. Coordinate changes with the building’s safety, infection-control, process or laboratory requirements where applicable.
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Use a balanced decision test
| Question | Evidence to review | Decision safeguard |
|---|---|---|
| Will operating cost or water use fall? | Meter trends, run hours, weather and occupancy | Use a defined baseline and review period |
| Could reliability or downtime worsen? | Criticality, redundancy, alarms and failure history | Test safeties and retain a rollback plan |
| Will occupants remain comfortable and healthy? | Temperature, humidity, ventilation indicators and complaints | Verify occupied conditions, not only equipment status |
| Can staff sustain the change? | Training, workload, access and documentation | Assign ownership and include it in routine work |
| Does it fit the existing system? | Controls capability, equipment limits and interfaces | Confirm the sequence with qualified personnel |
| Can results be demonstrated? | Available meters, trends and inspection records | Log the change, method and outcome |
Putting the nine practices into an operating rhythm
Facilities do not need to launch nine separate projects. Build the practices into a repeatable cadence:
- Weekly: review alarms, overrides, critical equipment status, urgent comfort reports and obvious after-hours operation.
- Monthly: compare energy and water trends with occupancy and weather; inspect schedules, deferred defects and preventive-maintenance completion.
- Quarterly: perform representative occupied and unoccupied walk-throughs, review control trends, test selected sequences and update the action register.
- Annually or after major change: reassess goals, verify documentation, review IEQ and safety performance, and plan recommissioning or deeper diagnostic work.
Prioritize actions by risk and opportunity. A schedule correction that removes unnecessary run hours may come before a complex control upgrade; a ventilation or safety defect takes precedence over either. Every intervention should have an accountable owner, a verification method and a date for review.
Common failure modes and practical fixes
Changing setpoints without a baseline
Symptom: savings or comfort claims cannot be separated from weather, occupancy or simultaneous changes. Fix: record the original sequence, define a comparison period and change one material variable at a time when feasible.
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Symptom: equipment runs continuously or ignores the intended schedule. Fix: require an owner, expiration date and reason for every override; review the override list routinely.
Maintenance that ignores controls
Symptom: clean, lubricated equipment still cycles excessively or fails to meet conditions. Fix: add sensor, actuator, schedule, sequence and alarm checks to work orders.
Energy-only optimization
Symptom: complaints, humidity excursions, poor ventilation or safety concerns rise after a “saving” change. Fix: include IEQ, comfort, safety and reliability acceptance criteria before implementation.
Undocumented fixes
Symptom: the next operator reverses a useful change or cannot diagnose a recurring fault. Fix: update the sequence, trend notes, drawings and training records at close-out.
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