Figuring out whether there is a spirit or ghost in your house is a question people seem to be asking themselves the world over, and have done all the way back to ancient times.
Different cultures, countries and faiths have documented different types of otherworldly spirits through out the ages and accounts vary from spiritual contact through 'mediumship' and 'seance' to the Biblical passages associating 'spiritism' to forbidden occult activity.
In short, although the idea of the supernatural is a cultural universal, ghosts and spirits seem to have been making themselves known in different ways and forms for a while now, and working out whether there is a spirit present in your house might begin by working out what kind of spirit you should be looking out for.
One thing that remains consistent throughout many accounts is the link between a spirit and a physical location on earth, so a good starting point would be to do some research on your house, look into possible previous occupants, the history of the local area, the land on which your house is built; all these questions could reveal the likelihood or even an explanation for any supernatural activity.
A common reason given for spirits 'haunting' a specific location is because that location was the scene of some sort of violence or betrayal that resulted in a death, often ghosts are portrayed as being vengeful. Another suggestion is that when a spirit gets trapped between our world and the next world, it is likely to return to the place where it's energies and memories are the strongest, and in some beliefs, the appearance of a ghost is an omen of an impending death.
In modern times, people have reported everything from visual signs like inanimate objects moving and visions of ghosts, to auditory evidence like moaning or screaming, or even particular smells and odors becoming prominent during supernatural experiences.
Skeptics have come up with various possible scientific explanations ranging from tectonic activity to changes in air pressure that might explain physical occurrences that we cannot currently understand, but the truth is that reports of haunting continue, and can either vary greatly or be completely identical from one case to another.
You will only know if you actually believe in ghosts. If you don't then you will more than likely never feel that sensation, as they won't actually exist for you. On the other hand if you are a believer then you will experience changes in the room temperature, slight smells that are unfamiliar to you and cannot be explained by any of your regular odors.
Depending on how intuitive you feel you are to the other side, then you will be able to feel the presence of the entity and will possibly be privy to hearing them breathe or brush against you.
It seems to happen a lot to people who are having issues in their lives and are going through, or have gone through, a certain amount of stressful trauma. This heightened emotional state would seemingly tune you in to a higher sense of attachment to the spirits as your emotional state is open unguarded and lacking inhibition, this would be the optimum emotional condition to feel a ghost's presence.
Another way is to wait till it is dark and sit in the room where you feel your ghost may be. Close your eyes and focus your mind on just the ghost and being open to receive any message they have for you. Open your eyes after a couple of minutes and look around the room, if you are lucky they will show themselves to you.