A cool dry place like a closet would be ideal for summer storage. Your school may have a room or rooms that are kept cooled over the summer that you may be able to keep them in. Alternately, have your school allow you to take them with you over the summer, as most schools turn off the air conditioning. If those options are not available, the bottom of a dark cabinet may be adequate. We also recommend having them at about 50% charge (charge fully, leave powered on for approx. 30 min, then power off) before storing them. Storing Ozobots at high capacity for a long period of time may be detrimental to the battery.