Winter turns your office into a personal icebox. A big space heater is overkill. A tiny fan is a joke. Feet go numb, wrists stiffen, and focus goes missing. An under-desk infrared heater changes the equation. It warms the person, not the whole room, so you stay comfortable without turning the air into a sauna. What we built, and why it matters We built this under-desk unit around a carbon fiber infrared element. It gives a steady, even glow and comes up fast. The real workhorse is the reflector. We mapped the reflector profile using geometric optics to spread the beam evenly while keeping the intensity up. The payoff is a controlled radiant pattern that covers your lower legs and feet with fewer hot and cold patches. It runs 400–800 watts on two settings, plugs into any standard 120V outlet, and sits just 8 inches tall with a low-profile footprint. A built-in thermostat holds your set point, and tip-over protection kills the element if the unit gets knocked over. Why this approach works at a desk At your desk, you need warmth that shows up quickly, stays steady, and keeps your feet and legs cozy without blasting your face. Infrared warmth delivers that direct, sun-like feeling. The optimized reflector makes sure the energy lands where you need it. You get comfort in seconds, quiet operation, and you use less energy than you would heating the entire room. In offices, home workstations, or drafty corners, that means fewer distractions and less time fiddling with controls. What to expect, straight from the shop floor Infrared heats surfaces and people directly, so the air can still feel cool. Keep the unit aimed at your lower body for the best comfort. It needs a grounded outlet and at least 12 inches of clearance from fabrics and furniture. It won’t replace whole-room heating on the coldest days. But as a personal heater, it keeps you focused, comfortable, and efficient.