Running an OpenStudio model with a packaged rooftop air conditioner, and adjusted the heating setpoints such that they would not turn on. We do not have a hot water loop. However, the natural gas heating is still deployed, however minimally, throughout the year. Any idea as to why?

Running an OpenStudio model with a packaged rooftop air conditioner, and adjusted the heating setpoints such that they would not turn on. We do not have a hot water loop. However, the natural gas heating is still deployed, however minimally, throughout the year. Any idea as to why?