It can be hard to know when the stack effect is at work in your home because it is a largely unseen occurrence. However, there are a few things you can be on the lookout for.    Slamming Doors and Drafts    The most noticeable component of the stack effect is the creation of a channel of air that runs throughout a home. This channel of moving air has many effects on a property, but the most visible and tangible are drafts. These will make it harder to maintain a consistent temperature in your home and put a strain on your HVAC.    More than this, a strong draft is like to cause windows, doors, and shutters to slam when it picks up. If you notice that certain doors or windows are prone to slamming shut or open when left ajar, it is likely the stack effect is the cause. This is also an indicator that the room in question is close to the main channel of air running through your home.     Increased Energy Usage    One of the main issues with the stack effect is that it destabilizes the climate and environment inside your home. As such, you will find that the levels of relative humidity and temperatures inside your home fluctuate regularly inside your home. This is not just uncomfortable (and potentially unhygienic), but costly for you and your home.    Humid air is, in and of itself, harder to heat and cool than arid air. As such, your HVAC system will struggle not only with the fluctuating temperatures in your home, but it will have to work harder when the air being brought in by the stack effect is humid. This will increase your energy consumption and, by proxy, your energy bills.