This living space is a renovated house in Madrid that features a cool swimming pool on the first level. The property is only 8×8 meters on two floors and an attic but it features amazing views of the roofs of Madrid’s historic center. The house incorporates four machines to control and condition the temperature and humidity of the spaces in accordance with comfort needs. Passive conditioning is solved through cross-ventilation. The lower level is waterproof (floors, walls and ceilings are painted with white chloride rubber and the sheet staircase is treated with marine varnish), which permits creating unusual comfort conditions in a domestic environment like, for instance, submerging in the warm water of the pool while it rains or snows.