The Thermostat Was Calibrated for a 40-Year-Old Man in 1966PREVIEW

ASHRAE Standard 55's comfort model came
from experiments in the 1960s using young,
healthy, non-acclimatised American men
sitting quietly in climate chambers. A
73-year-old Indian woman sitting in an
office is not the experimental subject.

ASHRAE Standard 55's foundational comfort
research was conducted between 1966 and
1975 by Fanger, McNall, and colleagues at
Kansas State University. Subjects were
primarily male (male-skewed sampling),
aged 18 to 35 (non-elderly), with standard
body weight (BMI 18.5 to 25), and
sedentary occupation (minimal metabolic
rate variation). The studies took place in
climate-controlled chambers in the United
States Midwest, far from tropical heat
environments.

No data from Indian occupants. No data
from women with different thermoregulatory
setpoints. No data from older adults with
reduced cold tolerance. No data from
people with metabolic disorders or on
medications that affect thermal sensation.
The comfort standard that governs
buildings housing 7.5 billion people was
calibrated on a narrow demographic.

Thermal sensitivity varies systematically.
Research on thermal preference shows
women, on average, prefer temperatures 0.4
to 0.8 degrees Celsius higher than men at
the same operative temperature. This is
not personal preference. This is
physiology: women have lower basal
metabolic rates and lower skeletal muscle
mass, reducing heat generation. They reach
peripheral cold sensation (shivering
threshold) at lower ambient temperatures.

Older adults show increased sensitivity to
both heat and cold, with reduced ability
to thermoregulate through vasoconstriction
and vasodilatation. A person aged 70 has a
narrower comfort bandwidth than a person
aged 25. People taking certain medications
(antihistamines, diuretics, stimulants)
have altered thermal sensation. None of
this is reflected in ASHRAE 55. The
comfort standard is a ghost of 1960s
thermal physiology.

Biothermal Microconditioning operates
through adaptive comfort, not ASHRAE fixed
setpoint. Occupants within a Thermopod
cluster experience local cooling that is
present when the person sits and absent
when they move. The system adapts to
occupant presence, occupant thermal
comfort, and occupant acclimatisation. No
fixed thermostat. No false universality.
Just biology-responsive cooling. Easy
Retrofit. One day. The ghost of 1966 is
finally laid to rest.