Thermal Comfort
Thermal comfort is one of the clearest ways occupants experience the environmental performance of a commercial building.
Quick Answer
Thermal comfort relates to WELL Certification because the WELL Building Standard considers how indoor conditions affect the people who occupy a building. Thermal comfort is influenced by air temperature, radiant temperature, humidity, air movement, clothing, activity levels, HVAC systems, glazing, shading, façade design and operational controls.
In commercial buildings, thermal comfort is not only a temperature setting. It is the result of how the building envelope, mechanical systems, solar exposure, internal layout and occupant expectations interact over time.
Thermal comfort is one of the most immediate ways people judge a workplace or commercial interior. A space may look well designed, but if occupants regularly feel too hot, too cold, exposed to radiant heat, affected by draughts or unable to control their local environment, the building may not perform well as an occupied space.
WELL places thermal comfort within a broader indoor environmental quality framework. This means comfort is considered alongside air quality, daylight, acoustics, materials, movement, mind and community. It is part of the relationship between the building and the people who use it every day.
For project teams, this makes thermal comfort more than a services issue. It becomes a coordination question across architecture, façade design, HVAC strategy, operational management and occupant expectations.
A common mistake is to treat thermal comfort as a simple thermostat issue. Air temperature is important, but it is only one part of the comfort equation. Occupants may experience discomfort because of hot glazing, cold surfaces, uneven air movement, direct sun, high humidity, poor zoning or a mismatch between activity level and system control.
In commercial buildings, thermal comfort is shaped by both passive and active systems. The building envelope affects heat gain and heat loss. The façade affects radiant comfort and solar exposure. The mechanical system affects air temperature, air movement and control. The fitout affects layout, density and how people use the space.
This is why two spaces with the same air temperature can feel very different to the people occupying them.
The temperature of the surrounding air affects comfort, but it needs to be considered together with humidity, air speed and radiant conditions.
Glazing, exposed surfaces, solar gain and surrounding materials can make a space feel warmer or cooler than the air temperature suggests.
Air speed can support comfort in some conditions, but unwanted draughts or uneven air distribution can create discomfort.
Humidity influences how occupants perceive warmth, freshness and comfort, particularly in mechanically conditioned commercial spaces.
The building envelope has a major influence on thermal comfort. Glazing, insulation, shading, orientation and façade design affect solar heat gain, heat loss, radiant comfort and the load placed on mechanical systems.
In commercial buildings, occupants sitting near windows may experience very different conditions from those located deeper in the floorplate. A highly glazed façade may improve daylight access, but it can also create glare, solar heat gain and radiant discomfort if not carefully managed.
This is where thermal comfort connects with daylight, glare, façade performance, HVAC load and workplace layout. WELL-related comfort outcomes are often shaped by these relationships rather than by one discipline alone.
HVAC systems play a central role in thermal comfort, but system capacity alone is not enough. Zoning, control settings, commissioning, maintenance, air distribution and operating schedules all affect whether comfort conditions are delivered consistently during normal occupancy.
A system may be capable of meeting a design target, but occupants can still experience discomfort if controls are poorly tuned, spaces are used differently from the design assumptions, or internal loads change over time.
For WELL Certification or WELL-aligned reviews, this means thermal comfort should be considered not only during design, but also during commissioning, occupation and ongoing building management.
Thermal comfort modelling can help project teams understand how a space is likely to perform before it is built or occupied. It can identify areas where solar exposure, façade performance, internal loads, air movement or HVAC strategy may create comfort risks.
This modelling can be useful when WELL is being considered because it provides a clearer view of the internal environmental conditions that occupants may experience. It helps connect the language of comfort with the physical behaviour of the building.
Thermal comfort modelling does not replace WELL Certification, but it can support better design decisions, reduce uncertainty and help project teams coordinate comfort-related strategies earlier in the process.
In existing buildings, thermal comfort issues are often discovered through occupant feedback, tenancy changes, seasonal complaints, high energy use or difficulty maintaining stable indoor conditions. These issues may be caused by façade limitations, HVAC settings, maintenance gaps, internal loads or changes in how the building is being used.
WELL can provide a framework for reviewing these issues as part of a broader indoor environmental quality strategy. Rather than treating comfort complaints as isolated problems, the project team can consider how air quality, ventilation, solar exposure, control systems, occupancy and workplace expectations are interacting.
This can support both formal WELL pathways and more general occupant environmental quality reviews.
Thermal comfort sits at the intersection of occupant experience and technical building performance. It is affected by energy strategy, façade design, mechanical systems, internal planning, control logic and building operations.
This makes it one of the strongest bridges between WELL Certification and the wider building performance ecosystem. A project that considers thermal comfort properly is not only thinking about comfort as a feeling. It is thinking about how the building performs for the people who use it.
For Certified Energy’s commercial performance ecosystem, thermal comfort belongs beside daylight modelling, CFD, ventilation, NABERS, façade performance and operational energy as part of a more complete understanding of environmental building intelligence.
Related Knowledge Hub
For a broader overview of WELL Rating, WELL Certification, indoor environmental quality and commercial building performance, visit the Certified Energy WELL Rating Knowledge Hub.
Read the WELL Rating Knowledge Hub