The signs of a ghost in your house worth a second look are the ones that repeat: cold spots in the same corner, small objects moving when no one is home, pets fixating on empty space, footsteps with a pattern. One strange night means little. A pattern over weeks, unexplained by the house itself, is what merits attention.
First thing, and I mean this. You are not foolish for wondering. Plenty of level headed people have stood in their own kitchen at two in the morning, felt watched, and talked themselves out of it by breakfast. My job is not to hype that feeling or to laugh at it. It is to help you separate the signal from the plumbing, and I do a lot of that work with people on my page.
What are the signs actually worth noticing?
The ones that repeat in the same place and stack together. A cold spot that sits in one exact corner, day after day. Small objects that move or vanish and turn up somewhere they have no business being. Electronics that misbehave in one room only. A pet who tracks something invisible across a wall, hackles up. A persistent sense of being watched that follows you room to room. And sounds with a rhythm, footsteps, three even knocks, rather than the random creak of a settling floor.
Any one of these alone is thin. What raises my eyebrow is when several land in the same spot, at the same times, over weeks. That clustering is the difference between a quirk and something worth investigating.
None of this makes you gullible for asking. The paranormal draws careful, curious people far more than it draws the credulous, at least in my experience, because careful people are the ones who actually write down what happens instead of shrugging it off or scaring themselves in the dark. Curiosity paired with a plain notebook is exactly the right posture to bring to a house that feels off. Note the time, the room, the weather, and who else was home. Keep it up for a fortnight, and let the pattern, or the absence of one, do the talking for you.

Which signs are almost always something ordinary?
Most of them, honestly, taken one at a time. Cold spots are usually drafts from old window frames, a chimney flue, or a gap under a door. Flickering lights and dead batteries point to wiring and load, not a presence. Shadows sliding across your peripheral vision are how the eye is built, since the edges of your sight read movement and shape far better than detail. The feeling of being watched is an overtired nervous system plus pareidolia, the brain's habit of finding faces and figures in noise.
One thing I will not gloss over. A carbon monoxide leak can cause dread, confusion, hallucinations, and a whole household feeling ill and uneasy at once. If several people or pets feel sick and spooked together, buy a detector today and see a doctor before you consider anything unseen. That is not me being a killjoy. That is the one haunting that genuinely hurts people.
Why do pets and babies seem to notice first?
Because they react to things the rest of us filter out. A dog's hearing and nose catch drafts, vermin in the walls, and high frequencies we miss entirely. A cat locked onto a blank wall is usually following a dust mote, a bug, or a shift in light, which I get into in why does my cat stare at nothing. A baby giggling at an empty corner is most often new vision finding contrast and motion, not a visitor, and I said the same in babies laughing at nothing.
So yes, they notice first. That does not mean what they notice is a ghost. It means their filters are set wider than yours.

What should you actually do first?
Rule out the ordinary, methodically, before you reach for anything else. Walk the house in daylight and check every window seal, the heating vents, and the pipes. Write down the time and room each event happens, because patterns point to causes: the heating cycle kicking on, a neighbor's late shift, the fridge compressor. Get that carbon monoxide detector. Keep a plain log for two weeks. Only if a pattern holds after all that, and still has no ordinary explanation, is it worth taking further, which is where haunted house signs and what to do picks up.
If it keeps up and you want a second read on what you are sensing, a live reading can help you tell intuition from nerves, and I walk through how those sessions run in the live psychic chat guide. You may also simply be picking things up more than most people do, which the how psychic are you quiz can hint at.

Can a house feel haunted after someone dies there?
Grief rewires perception, so yes, and it fools good people. The bereaved brain scans constantly for the person it lost and will conjure their footsteps, their scent, the creak of their chair. That is a documented part of mourning, not proof of a spirit, and it usually eases over months. If it is distressing rather than comforting, a grief counselor helps far more than a ghost hunter ever could.
Do cold spots really mean a spirit is present?
Only if the cold spot is isolated, stable, and genuinely unexplained. A real anomaly is small, sharply bordered, and does not track with any vent, window, or door. Around nine in ten reported cold spots are simple drafts. Test yours: hold a thermometer in it, then light an incense stick nearby and watch which way the smoke drifts. Moving air gives the game away almost every time.
Is it a ghost or just an old house settling?
Old houses expand and contract as the temperature changes, which produces cracks, pops, and knocks, loudest at dusk and dawn when the day's heat leaves the frame. If your sounds cluster at those hours and shift with the seasons, the building is talking, not the dead. A newer house on a cold snap does the same thing through its joists and ductwork.
I sat with a woman last winter who was sure her landing was haunted. The same three knocks, most nights, around eleven. We logged it. The knocks matched her upstairs neighbor dropping his work boots by his door after a late shift, one, two, and a stumble. She laughed, then cried a little, because some part of her had wanted it to be her late father. Now and then that is the real signal buried under the noise.