The Office Thermostat Was Never Set for You — It Was Set for a Man Who Retired 30 Years Ago
Every open-plan office in America seems to have the same unspoken ecosystem. One group of employees sits comfortably in short sleeves. Another group — statistically, more likely to be women — keeps a dedicated desk blanket, a cardigan draped over the chair, and a space heater they've been told three times to unplug. The thermostat reads somewhere in the high 60s. Everyone calls it "the AC problem" and assumes facilities management is just bad at their job.
The facilities team isn't entirely to blame. The temperature you're shivering through was engineered — just not for the office you're actually sitting in.
A Formula Built in a Very Different Era
The thermal comfort standards that govern most American office buildings trace back to research conducted in the early 1960s, eventually codified by ASHRAE — the American Society of Heating, Refrigerating and Air-Conditioning Engineers. Their Standard 55, first published in 1966 and updated periodically since, defines the conditions under which a space is considered thermally acceptable.
The formula itself sounds technical and neutral: it calculates a "predicted mean vote" — an estimate of whether a room full of people will feel too hot, too cold, or just right. But the inputs matter enormously. The original metabolic rate used to build the model was based on a resting male office worker weighing approximately 154 pounds. His clothing was assumed to be a business suit. His metabolism — the rate at which his body generates heat — was set at roughly 1 met, a unit measuring metabolic output at rest.
That number became the baseline. And that baseline shaped the thermostats in millions of buildings across the country.
The Metabolism Gap
Here's the biological reality the formula didn't fully account for: men and women generate different amounts of body heat at rest, and the gap is meaningful. Research published in the journal Nature Climate Change in 2015 drew significant attention when it quantified the problem directly. The study found that the metabolic rate used in the standard thermal comfort model overestimates female resting metabolism by roughly 20 to 35 percent. In plain terms, the formula assumes women produce more body heat than they actually do — which means it consistently calculates spaces as warmer for women than they actually feel.
Women also tend to have lower skin temperatures than men at the same ambient temperature, partly due to differences in body composition, surface-area-to-mass ratio, and how the body distributes blood flow. These aren't minor variations. They're consistent, measurable physiological differences that the original model simply didn't build in.
The result is a thermal standard that treats one metabolic profile as universal — and that profile skews heavily male.
Why the Standard Barely Changed
ASHRAE has updated Standard 55 multiple times over the decades, most recently in 2023. The updates have addressed humidity, radiant temperature, air speed, and other variables. The core metabolic rate assumption has been adjusted somewhat, but the fundamental architecture of the model — built on mid-century male physiology — has proven remarkably sticky.
Part of this is institutional inertia. Building systems are expensive to redesign, and HVAC engineering is a field that moves slowly by necessity. Part of it is that "thermal comfort" research itself has historically been conducted with predominantly male subjects, which means the data feeding the models has the same blind spot as the models themselves.
And part of it is simply that the people making decisions about office temperatures — for most of the 20th century — were disproportionately the people who weren't cold.
What the Research Actually Says About Temperature and Work
Beyond comfort, there's a productivity angle here that employers arguably should care about. A 2004 study by researchers at Cornell found that raising office temperatures from 68°F to 77°F was associated with a significant drop in typing errors and an increase in typing output. Workers made about 44 percent more errors and typed 150 percent less at the cooler temperature.
Other research has found that thermal discomfort — being too cold, specifically — increases distraction and reduces cognitive performance on detail-oriented tasks. When workers are busy managing their physical discomfort, they have less attentional bandwidth for actual work. The cost of the space heater under someone's desk might be less than the cost of the cognitive load they're carrying to stay warm enough to function.
The Cardigan Shouldn't Be a Job Requirement
None of this means offices need to become saunas. Thermal comfort is genuinely individual — some people do run hot, and there's no single temperature that works for every body in every season. But the current default of pushing building temperatures to the low-to-mid 60s as a starting point, based on a 1960s male metabolic standard, isn't a neutral engineering choice. It's a legacy assumption that was never designed with today's workforce in mind.
The revised wisdom here isn't that cold offices are a conspiracy. It's that the formula behind them was never as universal as it was treated. A standard built around one body type, in one decade, for one kind of worker, quietly became everyone's reality — and most of the people it doesn't fit have been told to just bring a sweater.
That's not a comfort standard. That's a workaround.