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BETTESWORTHConstruction

Office Energy Settings: How to Tune HVAC, Lighting and Controls for Flexible Work

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Flexible-office energy settings work best when HVAC, ventilation and lighting follow actual occupancy rather than a fixed, building-wide routine. Start by mapping when and where people use the office, then adjust schedules and zones, set reasonable seasonal temperature targets, and check energy and comfort data together. There is no single temperature or savings percentage that applies to every building.

How should we set office HVAC for hybrid work?

Use actual occupancy patterns to shape HVAC and ventilation schedules, but do not simply turn equipment off whenever a room appears empty. A flexible office may have busy meeting rooms, quiet open-plan areas and intermittently occupied private offices at the same time. Their schedules and control needs can differ.

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Begin with the building’s available schedules and room-use information. Compare the hours people are present with HVAC start and stop times, and identify spaces that are routinely unoccupied while being conditioned or lit. GSA advises adjusting occupancy-based HVAC and ventilation to actual building occupancy times, or using occupancy-based controls. That guidance is a starting point, not permission to bypass ventilation requirements or equipment operating limits.

When attendance patterns shift, revisit schedules. A timetable built around a former five-day office week may run equipment unnecessarily on low-attendance days; conversely, a schedule that assumes a space is empty may leave it uncomfortable or inadequately ventilated when a team books it. Check how the building actually operates, including reservations, after-hours use and rooms with different thermal conditions.

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Before changing controls, establish who owns them and how the system is configured. A building automation system, central plant or lease arrangement may limit what an office operator can change locally. Facilities staff should confirm which schedules and zones can be adjusted, what minimum operating needs apply, and whether a qualified controls professional must make the change.

Why use schedules, zones and optimized start/stop?

Schedules establish when equipment is expected to serve occupied periods; zones let different spaces respond to different use and heat conditions. Night setbacks and optimized start/stop can reduce unnecessary runtime, but should be commissioned and checked against occupied-hour comfort.

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The EPA Facilities Manual describes zone-level temperature control, nighttime setback and optimized start/stop. In practical terms, a meeting room with intermittent bookings need not automatically follow the same profile as a continuously used office area. A zone can be scheduled or controlled independently only if the installed system supports that degree of control.

Optimized start aims to bring conditions toward the occupied target by the time people arrive, rather than starting all equipment at an unnecessarily early fixed hour. Optimized stop can reduce operation near the end of occupancy, while accounting for how quickly temperature drifts and whether the space remains comfortable. ASHRAE controls guidance likewise describes occupied-period scheduling and optimum-stop operation that considers temperature drift and comfort; it notes that ventilation should be provided throughout occupancy. Review the EPA Facilities Manual and ASHRAE controls guidance alongside the building’s equipment documentation and applicable current requirements.

Do not assume that a last meeting ending means all conditioning can stop immediately. Some systems need time to respond, spaces may remain occupied after booked hours, and ventilation must still match occupancy. Likewise, reducing runtime too aggressively may shift the problem from energy use to discomfort at arrival or before people leave. Adjust schedules in manageable increments, then check actual conditions in the relevant zones.

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What temperature should an office be in summer and winter?

There is no universally correct office temperature. Oregon’s statewide facilities policy provides one clearly defined example: office normal-operation settings of 70°F in winter and 74°F in summer, with a ±2.5°F float where feasible. Those are Oregon policy settings, not a rule for every climate, building, system or workforce.

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The policy’s approach is useful because it pairs target temperatures with an acceptable range and an effort to minimize equipment runtime. A reasonable temperature float can reduce the need to hold every space at one exact number, but the range should suit the building, occupants, system capability and local requirements. Oregon’s Statewide Policy 107-011-010 took effect April 17, 2024; facilities outside Oregon should treat its values as an example rather than adopt them automatically.

Setpoints also need to be interpreted by zone. A space with different heat gains or use may need a different operating profile from an adjacent area. If people report that one room is persistently too warm or too cold, check zone behavior and operating conditions before changing the target for the whole building. A building-wide adjustment can solve one complaint while making another area less comfortable.

Temperature is only one part of indoor environmental quality. GSA recommends occupant control over airflow, temperature and lighting as comfort strategies. Where the system permits, clear and usable local controls can help occupants address a real need without overriding the building’s broader operating plan. Explain which controls occupants may use, and how to report recurring problems.

Can occupancy sensors reduce lighting use in meeting rooms?

They can help make lighting responsive to room use, particularly in spaces that are often vacant between periods of occupancy. Sensor suitability depends on room layout, coverage, controls and the applicable code; have a qualified electrical or controls professional verify the design and requirements.

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GSA’s federal-building LED and controls guidance summarizes provisions in ASHRAE/IES 90.1-2022, including occupancy-sensing requirements for offices larger than 300 square feet and provisions for particular zones. This summary does not establish that the same rule applies to every office: requirements depend on space type, the locally adopted code and the exact use of a space. Confirm current local requirements rather than treating one standards edition as a universal code rule.

For a meeting room, consider whether its lighting can be controlled as an independent zone and whether the sensor can detect the room’s actual occupancy pattern. A sensor or timeout that does not fit the space can turn lights off while people are still present; a system that leaves lights on in empty rooms will not deliver the intended control. Have the building’s professional check sensor coverage, timeout, fixture compatibility and the control sequence before implementation.

Layout flexibility matters, too. GSA’s guidance on building systems upgrades recommends lighting systems that can accommodate private offices, conference rooms and open-office arrangements without modification when upgrades are considered. That can be useful when a flexible workplace changes room uses or partitions over time. It does not remove the need to verify controls and code compliance for the resulting layout.

See GSA’s LED lighting and controls guidance for its summary of the standard, and consult the building systems upgrades guidance when planning a flexible lighting system.

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How can we check that energy settings are not reducing comfort?

Track energy use and environmental conditions alongside occupant feedback. A schedule change is not a success if it lowers runtime but leaves people uncomfortable, or if it changes conditions in ways the team cannot see.

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Use building data that is already available to compare operation before and after adjustments. GSA identifies energy management systems and feedback on energy use and conditions such as temperature, humidity, CO₂ and light levels as useful parts of building operations. Look at the relevant zones and occupied periods rather than relying only on a whole-building total, which can conceal a persistent problem in a particular room.

Pair those trends with a straightforward way for occupants to report problems. Ask for the room, time and type of issue, and compare reports with schedules and available environmental data. Repeated reports of overheating at a specific time, for example, deserve investigation of that zone’s behavior rather than an automatic change to every office setpoint. GSA’s indoor environmental quality guidance emphasizes occupant control over airflow, temperature and lighting as part of comfort management.

Keep an adjustment log: record which zones or schedules changed, when the change took effect, and what energy and comfort indicators will be reviewed. If conditions worsen, restore the previous setting or revise the affected zone rather than allowing an unsuccessful change to persist. The cited guidance recommends monitoring and feedback but does not establish one universal savings percentage for the combined measures described here. Savings should be measured for the building and operating changes in question, not assumed from a general claim.

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What should we do with monitors, task lights and other plug loads?

Treat plug loads as a supporting measure, separate from central HVAC and general lighting controls. GSA recommends enabling power management on devices such as monitors and task lights, and using advanced power strips or manual-on, vacancy-off controls during unoccupied periods.

Start by identifying which devices are meant to be used only when someone is present and whether their power settings can be managed centrally or locally. A vacancy-off approach is intended to cut power during unoccupied periods, not to interrupt equipment that needs to remain on. Check the device and workplace requirements before applying a control, and make sure occupants know how it works so they can report a problem.

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These measures do not replace occupancy-matched ventilation, suitable HVAC schedules or compliant lighting controls. GSA includes plug-load measures within broader building operations guidance, which also calls for energy management, monitoring and occupant education. See GSA building operations and maintenance guidance.

What is a practical sequence for changing office controls?

Make changes in a documented sequence so the team can connect a control adjustment to its effect. The right schedule, setpoint and sensor arrangement depend on building conditions; use facilities and controls professionals where system configuration or code is involved.

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  1. Map actual use. Review building and room schedules against real attendance patterns, including meeting rooms, open offices and after-hours use.
  2. Inventory the controls. Identify which HVAC zones, ventilation schedules, lighting zones and plug loads can be controlled independently, and note system or policy constraints.
  3. Set the occupied operating plan. Confirm the periods when people are present and the ventilation and equipment needs that continue during occupancy.
  4. Adjust HVAC scheduling carefully. Consider setbacks and optimized start/stop where the system supports them. Check comfort around arrival and departure, not just whether equipment runtime changed.
  5. Choose seasonal targets and a suitable float. Use local policy and building requirements. Treat Oregon’s 70°F winter and 74°F summer settings with ±2.5°F float as an example, not a universal prescription.
  6. Review lighting controls by space. Check whether occupancy or vacancy sensing fits each room, verify sensor coverage and fixture compatibility, and confirm applicable current code with a qualified professional.
  7. Apply appropriate plug-load controls. Enable device power management and consider vacancy-off methods for suitable equipment without interrupting devices that need to remain on.
  8. Monitor, ask and refine. Review energy and environmental information alongside occupant reports. Adjust the affected zone or schedule if a change saves runtime at the expense of comfort.

For each choice, compare actual room and building occupancy, HVAC zoning capability, ventilation and comfort needs, control granularity, local code and the ability to track results. Those are more useful decision criteria than selecting one temperature or control setting for every flexible workspace. EPA, GSA and ASHRAE provide relevant operational and technical guidance, but the final sequence must fit the installed system and local requirements.

Frequently Asked Questions

Do hybrid offices need to run ventilation on days with few people?

Lower attendance does not by itself establish that ventilation can be stopped or reduced without restriction. Ask the building engineer or controls professional how the system’s required ventilation and minimum operating conditions apply to the space and schedule.

Should conference rooms and open offices share the same HVAC schedule?

Not necessarily: rooms can have different use patterns and heat gains, and the control system may permit separate zones. First verify whether they can be controlled independently and whether their schedules can reflect actual use without compromising comfort or ventilation.

Who should change building automation schedules in a leased office?

Start with the facilities manager or property manager, since the central controls may be managed by the landlord or a building engineer. Confirm authority and system limits before changing local controls or buying devices intended to alter HVAC operation.

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What does a high CO₂ reading tell an office manager?

It is an environmental condition worth reviewing alongside occupancy, ventilation operation and other available building data, not a stand-alone diagnosis of the cause. Escalate recurring readings to the building engineer or indoor-air-quality professional for interpretation in context.

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