Evidence Domain

Thermal Comfort

What it studies

The human experience of thermal environments: temperature, humidity, air movement, radiant conditions, clothing and activity — and the models (PMV, adaptive comfort) that predict satisfaction. Its central finding is inconvenient: thermal preference varies structurally between individuals, and no single setpoint satisfies everyone.

Why it matters

Thermal complaints are perennial, and the science explains why: metabolic and physiological differences produce genuinely different comfort ranges — including well-documented average differences by sex that standard comfort models historically ignored. The strategic consequence is architectural: since one temperature cannot satisfy all, personal control and thermal variety become the design answer.

Questions it answers
  • Why does no setpoint end thermal complaints — and what does?
  • How much does thermal preference vary across a population, and along which lines?
  • What do the comfort models predict well, and where do they fail?
  • How do thermal conditions interact with density, activity and setting type?
Evidence sources
  • Thermal comfort research (Fanger's PMV tradition and adaptive comfort models)
  • Field studies on inter-individual and sex-based comfort variation
  • ASHRAE 55 and EN 16798 standards
  • Occupant complaint and satisfaction data
Design and policy implications

Zonal control granularity as a specification requirement; thermal variety across settings so people can self-select; density decisions tested for thermal consequence; complaint patterns read as diagnostic data rather than noise.

Related methods
Common misuse

The setpoint wars: treating thermal comfort as a facilities argument to be won rather than a structural variance to be designed for. The evidence says provide control and variety; the practice keeps searching for the number that ends the emails.

Further research

Adaptive comfort in mixed-mode and flexible-occupancy buildings, and personal comfort systems (heated/cooled furniture) as a variance answer, are the field's applied frontiers.