Too Hot in One Office, Too Cold in Another: Commercial HVAC Troubleshooting
The meeting room feels warm halfway through a call, while someone at the front desk reaches for a sweater. One person lowers the thermostat, another turns it back up, and the same argument returns tomorrow. Uneven office temperatures can turn a normal workday into a series of small distractions. Finding the cause starts with understanding which spaces the system serves and how air reaches each one.
For commercial properties around Seattle and Tacoma, the useful question is what changed and when the discomfort appears. A complaint that began after an office remodel deserves a different investigation from a sudden loss of airflow. A clear description helps the technician connect the problem in the room with the equipment serving it.
Start with the pattern behind uneven office temperatures
Keep a short comfort log before the service visit. Record the room, time, thermostat setting, and what people notice. “The conference room gets warm during our afternoon meeting” is more useful than “the AC is bad.” Include whether doors were open or closed and whether the problem affects one room, one side of the suite, or the whole floor.
A marked-up floor plan can be enough. Add recent changes, such as new partitions, a moved desk, or different business hours. Choose one person to collect the reports so the service company receives a consistent picture. These observations do not establish a diagnosis, but they make it easier to arrange a visit while the problem is happening.
Give the air a clear path
Walk through the occupied space and look for supply vents or return grilles hidden behind cabinets, boxes, or partitions. The EPA’s office building guide explains why keeping those openings clear matters for air distribution and neighboring offices. Covering a vent to stop a draft can create another problem elsewhere.
Above the ceiling and inside the equipment, airflow needs a closer check. Dirty filters can restrict flow, and a disconnected or leaking duct can keep conditioned air from reaching its destination. The ENERGY STAR Building Upgrade Manual discusses filters, ducts, and testing and balancing as parts of the air-distribution system. A filter change may be necessary, while a persistent room-to-room difference may also need measured airflow and duct adjustments.
The thermostat needs a representative location
The temperature at the thermostat may differ from the temperature at a desk. Sunlight, a nearby appliance, or supply air blowing across a sensor can influence its reading. A sensor tucked behind a door or in a poorly mixed corner can also miss the conditions people experience.
For example, Trane’s Symbio 210 installation guidance calls for careful zone-sensor placement away from direct sunlight, supply-air streams, and other local influences. The appropriate location depends on the installed system. A technician can compare the sensor reading with a reference measurement and determine whether calibration, relocation, or a different control arrangement would help.
A separate room is not always a separate HVAC zone
A wall and a door create a room, but independent temperature control requires suitable HVAC equipment and controls. First establish which thermostat, rooftop unit, or air handler serves each space. That map is especially useful in a building with several tenants or equipment added at different times.
Some commercial buildings use variable air volume, or VAV, systems. These regulate airflow to individual zones through controlled dampers; some also have reheat. PNNL’s VAV maintenance guidance describes checks of temperature sensors, airflow sensors, damper response, and controls. The command shown on a screen needs to correspond to what the equipment actually does. Required minimum airflow also matters, so simply closing a damper is not a complete comfort solution.
Revisit the HVAC plan after a tenant remodel
Turning an open work area into enclosed offices can change the way air circulates. A former storage room used for meetings also has different needs once people occupy it. EPA’s guidance notes that changes in a space’s use may require HVAC modifications. Furniture and equipment placement deserve attention during planning, too.
Include the mechanical layout when reviewing a proposed remodel with building management. Where will supply air enter each new room, how will air return, and which sensor will control it? Resolving those details while the work is being planned is more straightforward than working around finished walls and occupied desks.
Check the schedule as well as the equipment
Compare programmed operating hours with the people now using the building. An earlier opening time or a regularly occupied Saturday may need a schedule review. The ENERGY STAR operations guide includes schedules, controls, temperatures, pressures, and flows in a useful assessment. It also recommends documenting control changes so the next person can understand how the building is intended to operate.
After adjustments, check the affected rooms during normal use and keep the comfort log for follow-up. A quiet, empty room during a service visit may not reproduce the complaint from a busy afternoon. Record the settings changed and the remaining issues rather than relying on memory.
Turn the findings into a clear repair plan
A useful service report connects each finding to a next step: clear an obstruction, repair a duct, correct a sensor, review controls, or arrange testing and balancing. Larger layout or zoning changes may need a design review. Keep equipment condition in the conversation; our guide to repairing or replacing an aging rooftop unit covers that separate decision.
If uneven office temperatures are disrupting your workplace, contact MACLAF at (425) 999-1216. We serve Seattle, Tacoma, and surrounding King and Pierce County communities. Tell us which rooms are affected and what has changed, and explore our heating and cooling services for your commercial property.