1. Why Toes Still Feel Cold in April
April days are warm, but mornings and evenings are still chilly. Even inside a heated office, many people report that their feet get unusually cold — heating is off, cooling hasn't started, yet something below the knees stays cool. This isn't in your head. There is a real microclimate under your desk that most people never notice.
2. The "Ankle-Level Microclimate" — Through the ASHRAE Lens
ASHRAE Standard 55, the international benchmark for indoor thermal comfort, specifies that the vertical air temperature difference between head height (about 110 cm) and ankle height (about 10 cm) should not exceed 3 °C for comfort[^1]. Real offices often exceed this. Radiative cooling from the floor slab, cold air sliding down from window sills, and stagnant air pooled under the desk combine to keep ankle-level air noticeably cooler than the upper body[^2]. Taking off an extra layer doesn't fix that gap — because the gap lives below the knees.
3. Peripheral Body Temperature and Focus — Frontiers in Physiology
A 2016 review in Frontiers in Physiology by Taylor and colleagues summarizes what happens when skin temperature at the extremities drops[^3]. When the hands and feet lose heat, the body constricts peripheral blood vessels to protect core temperature. Blood flow to the fingertips and toes drops, and the brain quietly receives a "conserve energy" signal. Attention, working memory, and reaction time all dip — not dramatically, but measurably. Over a four- or five-hour afternoon block, small drops add up to a real productivity difference.
4. Before Summer Cooling Starts, Spring Is the Tricky Season
In midsummer and midwinter, HVAC systems work hard to keep things even. April and May, by contrast, are the "neither hot nor cold" months when climate systems often sit idle. But the under-desk zone doesn't get the memo — radiative floor cooling and building airflow keep it cooler than the room average. Once cooling kicks in later in May, the problem reverses: cold air from the AC settles downward, which lands — yes — right at your feet. From a temperature perspective, spring is trickier than it looks.
5. Behavioral Design — Managing Foot Temperature by Design
"Wear thicker socks" is not really a solution, because the act of digging out wool socks every time is itself a friction. From a behavioral-design perspective, the environment needs to take care of itself. The answer is to set a "warmth anchor" right at the ankle-level microclimate. When the feet have a place to rest, they get separated from the cool floor air. And when that surface is itself warm, you don't need to change what you're wearing.
6. How ROUMO Thinks About Footrests and Temperature
ROUMO treats the footrest not only as a structural support, but as a climate device. LC99 lifts the feet off the cool floor. LC99 Heat adds a silver film heater with three temperature stages (40 / 45 / 50 °C), keeping the microclimate under the desk warm without turning on the whole room's heat. It's a design direction that works in spring and autumn (when HVAC is idle) as well as in summer (when cooling pushes cold air downward).
7. FAQ
Q. Is cold feet in spring really common?
A. Yes. Even when outdoor temperatures are mild, indoor microclimates and HVAC cycling can keep ankle-level air cooler than the rest of the room. Spring cold feet is a real pattern, not a rare complaint.
Q. How are LC99 and LC99 Heat different?
A. LC99 is the core footrest with adjustable height and angle (KRW 89,000). LC99 Heat adds three warming stages at 40 / 45 / 50 °C using a silver film heater (KRW 218,000).
Q. Does foot temperature really make a difference to focus?
A. Multiple studies link peripheral skin temperature to cognitive function at the margins. Don't expect dramatic changes from one variable, but cumulative effects through an afternoon are real.
Related Posts
- Spring Office Microclimate and Cold Feet — Ankle-Level Temperature Through the ASHRAE Lens
- Explore LC99 Heat
- Why the Soles Are Called the Second Brain
📚 References
[^1]: ASHRAE Standard 55 — Thermal Environmental Conditions for Human Occupancy. American Society of Heating, Refrigerating and Air-Conditioning Engineers. https://www.ashrae.org/technical-resources/standards-and-guidelines
[^2]: ASHRAE Handbook — Fundamentals (Chapter 9: Thermal Comfort). https://www.ashrae.org/technical-resources/ashrae-handbook
[^3]: Taylor, N.A.S., Tipton, M.J., Kenny, G.P. (2016). Considerations for the measurement of core, skin and mean body temperatures. Frontiers in Physiology. PMC4707817. https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4707817/