Article: Ideally, the tree should be kept in temperatures between 15 and 20 degrees Celsius (60 and 70 degrees Fahrenheit). During the summer, you can usually keep the bonsai outdoors. You'll need to bring it indoors once temperatures start dropping below 15 degrees Celsius (60 degrees Fahrenheit) during the day and 10 degrees Celsius (50 degrees Fahrenheit) during the night. During the winter months, it might actually help the tree if it is consistently kept between temperatures of 10 and 15 degrees Celsius (50 and 60 degrees Fahrenheit). These temperatures are low enough to send the tree into dormancy but high enough to prevent the tree from dying. Place the bonsai in a spot that receives direct sunlight in the morning and indirect sunlight or shade in the afternoon. Morning sunlight isn't too intense, but direct sunlight in the afternoon can be too strong and may burn the leaves of the bonsai, especially during the summer months. If you decide to move an indoor bonsai outdoors, let it acclimate to direct sunlight slowly to prevent the leaves from burning. Keep it in the sun for longer periods of time day after day until it seems strong enough to spend an entire day in the sun. Sunlight also encourages the leaves of the Chinese elm to stay smaller. Keep the Chinese elm in an indoor or outdoor area that receives plenty of air flow. When keeping the bonsai inside, place it in front of an open window or place a small fan nearby to increase the amount of air movement. While air circulation is good for the bonsai, you should also note that cold drafts and winds can cause damage. When you keep it outside, position it behind a taller plant or structure to help protect it against nasty gusts.
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Keep the bonsai in a warm location. Provide plenty of morning sunlight. Maintain good air circulation.