When the doors inside your home close themselves mysteriously, it can be tempting to arrive at a supernatural conclusion. Perhaps it's your deceased grandma trying to say hello from beyond the grave? Maybe it's the dead former owners of your home who are now ghosts seeking vengeance for the fact that you dared to paint over their salmon pink colour scheme? The real explanation probably isn't so exciting, especially if you have air conditioning, but it's still a problem that needs to be identified and repaired.
An Air Pressure Imbalance
Doors that close themselves while your air conditioning is running might actually have been forced by a pressure imbalance. This can be due to an actual fault with the air conditioner, or it might simply be due to an improper setting. Instead of an even distribution of refrigerated air, your unit may be forcing cold fronts through your home. When doors move seemingly inexplicably, it's nothing but the cold air attempting to leave your home, creating an air pressure imbalance between your home and the outside. This can stress your air conditioner, shortening its lifespan, and can also increase your electricity usage. There's also the fact that your home won't be efficiently cooled. So what can cause such a pressure imbalance?
The Motor Fan
The fan inside the unit's motor might be operating at too high a setting for the space in question. Instead of allowing cooled air to be distributed around the room and ultimately reclaimed, it's simply forced outwards as it seeks an exit point. Take a look at the manual that came with your air conditioner. You can probably lower the setting of the fan yourself.
The Exhaust Fans
Overly enthusiastic exhaust fans can be another culprit. When too much air is being expelled, the air pressure can build up as the unit tries to regulate the amount of air being directed into the room. Again, have a look at your manual since you can probably adjust this setting yourself.
The Air Ducts
When the unit's air ducts have become compromised, the unit can have difficulty properly distributing cool air at all, which can result in changes to air pressure as it struggles to cool the room to your specifications. These ducts will require professional attention, but any company that offers air conditioning services will be able to repair or replace them.
So if the doors in your home start moving, it's probably a good idea to consider your air conditioner before you start planning a séance or exorcism. Contact a company that offers air conditioning services in order to learn more.