If you notice a weird smell coming from your air conditioner, you can’t blame the air outside your home because the system isn’t using outside air. Odors from the air conditioner are likely caused by odors in the home, perhaps from cooking food or pets. \
However, dirt and debris, and even insects may also get inside the AC unit and could be the source of any foul odors. If you think the air from the AC smells funny, give the unit a thorough cleaning and see if this improves things. \