Carbon Monoxide Hauntings: the Ghost With a Part Number

One haunted-house explanation is not a debunk but a RESCUE, and every page on this site defers to it. Carbon monoxide — odorless, colorless, from faulty furnaces, water heaters, flues and generators — binds hemoglobin and starves the brain. The early-poisoning symptom list reads like a case file from our archive: headache, fatigue, dread and doom-feeling, confusion — and, at higher or chronic exposure, auditory and visual hallucinations: footsteps, whispers, FIGURES.

Medicine's founding ghost story here is real: in 1921, ophthalmologist William Wilmer published the case of a family whose new house delivered classic haunting — nocturnal figures at the bedside, voices, the sensation of being held down, dying houseplants, exhausted servants seeing strangers. The investigation found a broken furnace flue venting CO through the house. Flue fixed; haunting evicted. The case is taught to this day, and modern versions recur — including the well-reported woman who saw a "ghost" in her shower while a CO leak quietly worked on her.

The overlap, mapped honestly

CO's signature quirks map onto haunting tropes with unnerving precision: symptoms WORSE IN ONE ROOM (nearest the leak) — the "bad room" of every house case; worse in winter (windows shut, furnace running) — the haunting season; affecting the whole household INCLUDING PETS (animals sicken first) — the corroboration that usually impresses juries; better on holidays away — "it doesn't follow us." Every one of those details, in a CO house, is a dosage map.

So this archive's standing rule, printed in our haunted-house pillar and repeated here: recurring dread, headaches, or apparitions concentrated in one dwelling = buy a CO detector TODAY, then call a technician, then — only then — write to us. The cases that survive a clean detector reading are the ones we publish. The ones that don't survive it get something better than publication: a fixed flue.