Swimming pools may be heated or unheated. Unheated and uninsulated freight cars were used. Woodland Hills Pool is an outdoor seasonal unheated swimming pool. This makes it an ideal fish for keeping in an unheated aquarium in cold climates. This close to being unheated tobacco product is unlike heated tobacco products. Grafts are moved into cold frames or unheated greenhouse in September until January. This style of heater is particularly useful in areas through which unheated air flows. Although the common areas are unheated, the individual stores do have heating systems. The outdoor pool is seasonal and unheated. Temperature control is achieved by mixing with unheated outside air. Some exiles had to live in unheated tents. Internal drives have the motor inside the autoclave in an unheated chamber. The name itself exemplifies the distinction between the warm greenhouse and the unheated cold frame. The monks are poorly clothed for winter conditions and the monasteries are unheated. Richard takes a low-paying campus job and spends winter break in an unheated warehouse.