In the heat of summer, you rely on your trusty air conditioner to keep you comfortable. The last thing you want is to experience is an unpleasant smell assaulting your senses when your cooling unit kicks on. If not well-maintained, your HVAC system, like any home appliance, could start emitting offensive odors. The source of these smells could range from innocuous to dangerous, which is why it’s important to understand what’s causing them and how to prevent them.