A tamper-resistant climate-controlled enclosure is provided for the outdoor housing of electronic equipment. The box-like structure provides a sealed environment for electronic equipment. The enclosure includes an intrusion alarm, a high temperature alarm and a low temperature alarm. A heater and an air conditioner are provided to maintain the temperature inside the enclosure between 60.degree. F. and 75.degree. F. to ensure that the electronic equipment housed therein works properly. The enclosure is especially useful for housing microcells used to transmit cellular telephone calls.