Yes, there are Midwesterners who choose not to use either heating or air conditioning during the spring due to the relatively mild weather in the region. Spring temperatures in the Midwest can vary, but they generally tend to be more moderate compared to the extreme heat of summer or the extreme cold of winter.
During the spring, the weather can be pleasant with milder temperatures, cool evenings, and comfortable days. As a result, some people may prefer to open their windows, use natural ventilation, and rely on fans or other cooling methods instead of using air conditioning. Additionally, as the temperatures are not extremely cold, they may not need to use heating systems during this season.
However, it's important to note that individual preferences vary, and some people may still choose to use heating or air conditioning during springtime based on their personal comfort levels and specific weather conditions in their area.