windowsill, heat, grid, ventilation, windows, heater, winter, apartment, room, flat, modern, vent, air, house, home, register, wall, return, baseboard, bedroom, coating, interior, metal, inside, double, glazed, airflow, architecture, building, ceiling, conditioning, cooling, outflow, panel, office, temperature, hot, cold, floor, system, design, installation, cozy, loft, comfortable, snug, homely, comfy, homelike, finish