HTRC (Hybrid Thermoelectric Rack Cooler) is a rack-integrated cooling system for AI servers that combines air, liquid, and thermoelectric (TEC) cooling in a single unit. It operates like a hybrid vehicle: under normal load, a 3-way valve forms a closed loop and the radiator handles heat through air cooling alone; when server load exceeds a threshold, the valve switches to the TEC loop, circulating coolant chilled by thermoelectric modules to the servers. This active, current-controlled regulation keeps GPUs within their optimal temperature range and concentrates cooling on hotspots. A built-in control IC predicts GPU load in real time and selects between energy-saving and boost modes automatically. Because the entire system fits inside the rack, no external chillers, CRAC units, or piping are required, reducing footprint while targeting a PUE of 1.1 to 1.2. The modular design scales from a single Edge node to multi-rack data centers.