Knocks in the small hours, the feeling of being watched from the hallway, the dog growling at an empty corner. If you landed here searching for "signs your house is haunted", you probably already have yours. Good news: there is an orderly way to settle the question — and it starts where nobody tells you.
This article does the three things almost no list of signs does: it puts safety first, gives you the normal explanation for each classic sign, and ends with a 7-day protocol for investigating your own home with instruments and timestamps. By the end you'll have an answer, whichever one it is.
The essentials in 20 seconds
- The vast majority of "haunted houses" are household physics: thermal shifts, pipes, drafts and infrasound.
- Before investigating anything: a carbon monoxide detector. Its symptoms mimic a textbook haunting.
- The right order: safety → physical causes → documentation → instruments.
- With the 7-day protocol and your phone, you settle it with data, not feelings.
First things first: two safety checks
Read this first
- Carbon monoxide (CO). A faulty boiler, stove or chimney releases an invisible, odourless gas whose mild poisoning causes headaches, fatigue, confusion, hallucinations and a sense of presence. There are documented cases of "hauntings" that were exactly this. If several people in the house feel unwell at once, or symptoms improve when you leave: ventilate, get out and call a technician. A CO detector costs less than a pizza.
- The electrical installation. Faulty wiring can generate intense, sustained electromagnetic fields; prolonged exposure to high fields has been linked in laboratory research to feelings of unease and presence. If your EMF radar shows very high constant values in the zone where the experiences happen, call an electrician before a medium.
The classic signs — and what they usually are
Every famous sign has a normal cause that explains most cases. Knowing them doesn't ruin the mystery: it filters the noise so that if something remains, it's worth your time.
Your case, coolly assessed: the checklist
Tick what you've observed in your home over the past month. The verdict won't tell you whether you have a ghost — nobody can tell you that — but it will tell you the sensible next step.
The 7-day protocol to settle it
If the checklist suggested investigating, do it properly: one week, one method, and decisions at the end — not every night at 3 AM with your pulse at 140.
Day by day
- Days 1–2 — Diary. Log every event with exact time, room, who was present and the conditions (heating, wind, washing machine). No interpreting: just data.
- Days 3–4 — Physical rule-outs. Cross-check the diary against the mundane: boiler schedules, water heater cycles, wind on the façade, the neighbours' routines. Tighten hinges, check draft seals.
- Day 5 — EMF baseline. Walk each room with the EMF radar and map the normal values and the sources (breaker panel, appliances, router).
- Day 6 — Targeted session. In the most active zone according to your diary: a 10-minute EVP session and a sweep with the SLS camera, everything timestamped.
- Day 7 — Night surveillance. Surveillance mode pointed at the active zone all night, with automatic alerts. You: go to sleep.
- Afterwards — Cold review. With a rested head, look for correlations: did any EMF spike coincide with a knock in the diary? Anything on the recording at the exact time of an alert?
The most likely outcome, said with affection and statistics: you'll find the thermal pattern, the pipe, or the neighbour on the night shift. And that's a win too, because you'll sleep soundly again. If instead something survives every rule-out and repeats with a pattern… then you have a genuinely interesting case — and a documented log any investigator will respect.
What to do if it still has no explanation
- Repeat the protocol. A pattern that repeats across two full weeks is infinitely more valuable than one strange night.
- Add a sceptical witness. Invite the most incredulous person you know and don't tell them where "the activity" happens. If they point at the same zone, log it.
- Don't contaminate the record. No ouija boards, no provocations, no mediums yet: any intervention adds variables you can't control.
- Look after the people who live with you. If someone in the house is having a hard time, their peace of mind comes before your curiosity. An investigation can also simply be closing the door and getting on with life.
The whole lab, in your pocket
GhostTech brings together EMF radar, EVP recording, an SLS camera, night vision and night surveillance mode in a single free Android app: everything the 7-day protocol needs, with all processing on your device.
Frequently asked questions about haunted houses
How do I know if my house is really haunted?
In order: first rule out health risks (carbon monoxide, faulty wiring), then the common physical causes (pipes, drafts, wood expansion, neighbours) and only then document for at least a week with a diary, timestamps and instruments like EMF radar, EVP recording and an SLS camera. The vast majority of cases resolve in the first two steps.
Why do I hear knocking in my house at night?
The usual culprits are thermal and hydraulic: wood and pipes contract as they cool at night, producing creaks and sharp knocks; water hammer snaps the plumbing when an appliance shuts off the water; and radiators keep clicking for hours after the heating goes off. Note the exact times for several days: if the knocks line up with temperature changes or appliance cycles, there's your ghost.
Can carbon monoxide seem like a paranormal phenomenon?
Yes — and it's why every home investigation must start with a CO detector. Mild poisoning causes headaches, fatigue, confusion, hallucinations and a sense of presence: there are documented cases of "hauntings" that were faulty boilers. If several people feel unwell at once, ventilate, get out and call a technician.
What does it mean when my pet stares at nothing?
Dogs and cats hear frequencies you can't and detect smells impossible for a human: a rodent inside the wall, an insect on the ceiling or the ultrasonic hum of a device explains most of those stares. It's a curious data point for your diary, not proof: log it with the time and look for correlation with your instruments.
What app can I use to investigate my house for free?
GhostTech for Android is free and includes an EMF radar using the phone's real magnetometer, EVP recording, an SLS camera, night vision and a surveillance mode to monitor rooms overnight. Sensor detection is processed on your device.
Conclusion
A house doing strange things is, almost always, a house being a house: wood that breathes, water that knocks, air that moves and brains that fill in the gaps. The good home investigator's path runs from safety to physics and from physics to data — and only at the end, if something survives everything, to mystery. Whichever way your journey ends, walk it with method: it's the only way the answer, whatever it is, will actually serve you. When you're ready for day 6's session, the step-by-step phone ghost-hunting guide will take you by the hand.
Remember: these tools are for entertainment and technical experimentation. No app can confirm or rule out presences, and a home's real risks (CO, electricity, gas) always come before any investigation. If there are physical symptoms, consult professionals. Investigate with respect, safety and a critical mind.