Fever (hyperthermi) is a condition where body temperature is higher than usual, fever occurs when the immune system struggles against infection. In medical terms, a person is called a fever if the temperature reaches 37.5 degrees Celsius or more. Compress is a method of maintaining body temperature by using liquids or devices that can cause warm or cold to the parts of the body that need it. So far, people still use compresses in traditional ways which can be said to be quite complicated because there are no tools that can help provide more effective and efficient results in the compression process. This study aims to design electrical compressors to facilitate the public and health workers in helping provide therapy for patients who have fever (hyperthermi). This therapeutic device is controlled using the ATmega 8 microcontroller, uses peltier as a heater and uses the NTC (Negative Temperature Coefficient) sensor as a temperature detection sensor. After temperature testing, the highest error in testing was 30 times at 43ºC the percentage of error was 0.88%. In temperature sensor sensitivity testing 41ºC-45ºC-41ºC the percentage of error is 1.39%. The highest error was for testing for 3 minutes at 43ºC the percentage of error was 0.75%. Overall, the tool system is temperature, timer, buzzer and data storage has worked well and the error value is still in tolerance that is below 5%. Thus this microcontroller-based electric compress device is capable of operating properly as a real therapeutic apparatus.